{"id":7758,"date":"2025-07-11T00:09:28","date_gmt":"2025-07-10T18:39:28","guid":{"rendered":"https:\/\/namastedev.com\/blog\/?p=7758"},"modified":"2025-07-11T16:07:55","modified_gmt":"2025-07-11T10:37:55","slug":"daily-tempterature","status":"publish","type":"post","link":"https:\/\/namastedev.com\/blog\/daily-tempterature\/","title":{"rendered":"Daily Temperatures"},"content":{"rendered":"\n  <!-- Next Greater Element I -->\n<link\n    href=\"https:\/\/cdn.jsdelivr.net\/npm\/prismjs@1.29.0\/themes\/prism-tomorrow.min.css\"\n    rel=\"stylesheet\"\n\/>\n<script src=\"https:\/\/cdn.jsdelivr.net\/npm\/prismjs@1.29.0\/prism.min.js\"><\/script>\n<script src=\"https:\/\/cdn.jsdelivr.net\/npm\/prismjs@1.29.0\/plugins\/autoloader\/prism-autoloader.min.js\"><\/script>\n\n<style>\n  .wp_blog_theme {\n    --primary: #e58c32;\n    --secondary: #f8c291;\n    --light-bg: #fef9f4;\n    --text-dark: #2d2d2d;\n    --tab-radius: 12px;\n    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);\n    --code-bg: #001f3f;\n    --code-text: #d4f1ff;\n  }\n\n  .wp_blog_container {\n    font-family: 'Segoe UI', sans-serif;\n    background: var(--light-bg);\n    margin: 0;\n    padding: 0;\n    color: var(--text-dark);\n  }\n    \/* Heading *\/\n    .wp_blog_main-heading {\n        text-align: center;\n        font-size: 2.4rem;\n        color: var(--primary);\n        margin-top: 2.5rem;\n        font-weight: bold;\n    }\n\n    \/* Explanation Card *\/\n    .wp_blog_explanation,\n    .wp_blog_code-tabs-container {\n        max-width: 940px;\n        margin: 2rem auto;\n        padding: 2rem;\n        background: white;\n        border-radius: var(--tab-radius);\n        box-shadow: var(--shadow);\n    }\n\n    \/* Text and Visuals *\/\n    .wp_blog_explanation h2 {\n        font-size: 1.4rem;\n        color: var(--primary);\n        margin-bottom: 0.5rem;\n    }\n    .wp_blog_explanation p,\n    .wp_blog_explanation li {\n        font-size: 1.05rem;\n        line-height: 1.7;\n        margin: 0.5rem 0;\n    }\n    .wp_blog_explanation code {\n        background: #fef9f4;\n        padding: 3px 6px;\n        border-radius: 4px;\n        font-family: \"Courier New\", monospace;\n    }\n    .wp_blog_explanation img {\n        max-width: 100%;\n        border-radius: var(--tab-radius);\n        margin-top: 1rem;\n        box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);\n    }\n\n    \/* Tab Buttons *\/\n    .wp_blog_code-tabs-header {\n        display: flex;\n        flex-wrap: wrap;\n        gap: 0.5rem;\n        margin-bottom: 1rem;\n    }\n    .wp_blog_code-tab-button {\n        padding: 0.6rem 1.2rem;\n        border: 1px solid var(--primary);\n        background: white;\n        color: var(--primary);\n        border-radius: 50px;\n        font-weight: 600;\n        cursor: pointer;\n        transition: all 0.3s ease;\n    }\n    .wp_blog_code-tab-button:hover {\n        background: var(--secondary);\n    }\n    .wp_blog_code-tab-button.active {\n        background: var(--primary);\n        color: white;\n    }\n\n    \/* Code Content *\/\n    .wp_blog_code-tab-content {\n        display: none;\n        background: var(--code-bg);\n        border-radius: var(--tab-radius);\n    }\n    .wp_blog_code-tab-content.active {\n        display: block;\n    }\n    .wp_blog_code-tab-content pre {\n        margin: 0;\n        padding: 1.5rem;\n        font-size: 1rem;\n        overflow-x: auto;\n        background: var(--code-bg);\n        border-radius: var(--tab-radius);\n        color: var(--code-text);\n    }\n<\/style>\n\n<div class=\"wp_blog_container wp_blog_theme\">\n<h1 class=\"wp_blog_main-heading\"><\/h1>\n\n<div class=\"wp_blog_explanation\">\n    <h2>Problem Statement:<\/h2>\n    <p>\n        Given an array of integers <code>temperatures<\/code> represents the daily temperatures, return an array <code>answer<\/code> such that <code>answer[i]<\/code> is the number of days you have to wait after the <code>ith<\/code> day to get a warmer temperature. If there is no future day for which this is possible, keep <code>answer[i] == 0<\/code> instead.\n    <\/p>\n\n    <h2>Examples:<\/h2>\n    <p><strong>Example 1:<\/strong><\/p>\n    <p><strong>Input:<\/strong><\/p>\n        <p>temperatures = [73,74,75,71,69,72,76,73]<\/p>\n    <p><strong>Output:<\/strong><code> [1,1,4,2,1,1,0,0]<\/code><\/p>\n\n    <p><strong>Example 2:<\/strong><\/p>\n    <p><strong>Input:<\/strong><\/p>\n        <p>temperatures = [30,40,50,60]<\/p>\n    <p><strong>Output:<\/strong><code> [1,1,1,0]<\/code><\/p>\n\n    <p><strong>Example 2:<\/strong><\/p>\n    <p><strong>Input:<\/strong><\/p>\n        <p>temperatures = [30,60,90]<\/p>\n    <p><strong>Output:<\/strong><code> [1,1,0]<\/code><\/p>\n\n    <h2>Constraints:<\/h2>\n    <ul>\n        <li><code>1 <= temperatures.length <= 10<sup>5<\/sup><\/code><\/li>\n        <li><code>30 <= temperatures[i] <= 100<\/code><\/li>\n    <\/ul>\n\n    <h2>Approach:<\/h2>\n    <ul>\n        <li>Traverse from right to left (last to first day).<\/li>\n        <li>Stack stores indices of days with temperatures in decreasing order.<\/li>\n        <li>For each element:\n            <ul>\n                <li>Pop from stack until you find a warmer day.<\/li>\n                <li>If stack is not empty, the top is the next warmer day \u2192 store the difference.<\/li>\n                <li>Push current day index onto the stack.<\/li>\n            <\/ul>\n        <\/li>\n    <\/ul>\n\n    <h2>Visualisation:<\/h2>\n    <img decoding=\"async\"\n        src=\"https:\/\/namastedev.com\/blog\/wp-content\/uploads\/2025\/07\/Screenshot-2025-07-11-at-12.06.14\u202fAM.png\"\n        alt=\"stack\"\n    \/>\n                <h2>Time Complexity:<\/h2>\n                <li>\n                  <p><strong>Time Complexity = O(n)<\/strong> \n                <\/li> \n                <h2>Space Complexity:<\/h2>\n                <li>\n                  <p><strong>Space Complexity = O(n)<\/strong> \n                <\/p>\n                <\/li>\n\n<h2>Dry Run<\/h2> <div style=\"background: #f9f9f9; border-left: 4px solid var(--primary); padding: 1rem; border-radius: var(--tab-radius); margin: 1rem 0;\"> <p><strong>Input:<\/strong><\/p> <pre style=\"white-space: pre-wrap; background: #fff5ea; padding: 1rem; border-radius: 8px; overflow-x: auto;\"> arr = [73, 74, 75, 71, 69, 72, 76, 73] <\/pre> <p><strong>State Transitions:<\/strong><\/p> <pre style=\"white-space: pre-wrap; background: #fff5ea; padding: 1rem; border-radius: 8px; overflow-x: auto;\"> Initialize: n = 8 ans = [0, 0, 0, 0, 0, 0, 0, 0] stack = []\nPush last index \u2192 stack = [7]\n\ni = 6 \u2192 arr[6] = 76\n\u2192 top = 7 \u2192 arr[6] >= arr[7] (76 >= 73) \u2192 pop 7 \u2192 stack = []\n\u2192 stack empty \u2192 no warmer day \u2192 ans[6] = 0\n\u2192 push 6 \u2192 stack = [6]\n\ni = 5 \u2192 arr[5] = 72\n\u2192 top = 6 \u2192 arr[5] < arr[6] (72 < 76)\n\u2192 ans[5] = 6 - 5 = 1\n\u2192 push 5 \u2192 stack = [6, 5]\n\ni = 4 \u2192 arr[4] = 69\n\u2192 top = 5 \u2192 arr[4] < arr[5] (69 < 72)\n\u2192 ans[4] = 5 - 4 = 1\n\u2192 push 4 \u2192 stack = [6, 5, 4]\n\ni = 3 \u2192 arr[3] = 71\n\u2192 top = 4 \u2192 arr[3] >= arr[4] (71 >= 69) \u2192 pop 4 \u2192 stack = [6, 5]\n\u2192 top = 5 \u2192 arr[3] < arr[5] (71 < 72)\n\u2192 ans[3] = 5 - 3 = 2\n\u2192 push 3 \u2192 stack = [6, 5, 3]\n\ni = 2 \u2192 arr[2] = 75\n\u2192 top = 3 \u2192 arr[2] >= arr[3] (75 >= 71) \u2192 pop 3 \u2192 stack = [6, 5]\n\u2192 top = 5 \u2192 arr[2] >= arr[5] (75 >= 72) \u2192 pop 5 \u2192 stack = [6]\n\u2192 top = 6 \u2192 arr[2] < arr[6] (75 < 76)\n\u2192 ans[2] = 6 - 2 = 4\n\u2192 push 2 \u2192 stack = [6, 2]\n\ni = 1 \u2192 arr[1] = 74\n\u2192 top = 2 \u2192 arr[1] < arr[2] (74 < 75)\n\u2192 ans[1] = 2 - 1 = 1\n\u2192 push 1 \u2192 stack = [6, 2, 1]\n\ni = 0 \u2192 arr[0] = 73\n\u2192 top = 1 \u2192 arr[0] < arr[1] (73 < 74)\n\u2192 ans[0] = 1 - 0 = 1\n\u2192 push 0 \u2192 stack = [6, 2, 1, 0]\n<\/pre>\n\n<p><strong>Final Output:<\/strong> <code>[1, 1, 4, 2, 1, 1, 0, 0]<\/code><\/p> <p><strong>Final State:<\/strong> <code>stack = [6, 2, 1, 0]<\/code><\/p> <\/div>\n\n<\/div>\n\n<div class=\"wp_blog_code-tabs-container\">\n    <div class=\"wp_blog_code-tabs-header\">\n        <button class=\"wp_blog_code-tab-button active\" data-lang=\"js\">\n            JavaScript\n        <\/button>\n        <button class=\"wp_blog_code-tab-button\" data-lang=\"py\">Python<\/button>\n        <button class=\"wp_blog_code-tab-button\" data-lang=\"java\">Java<\/button>\n        <button class=\"wp_blog_code-tab-button\" data-lang=\"cpp\">C++<\/button>\n        <button class=\"wp_blog_code-tab-button\" data-lang=\"c\">C<\/button>\n        <button class=\"wp_blog_code-tab-button\" data-lang=\"cs\">C#<\/button>\n    <\/div>\n\n    <div class=\"wp_blog_code-tab-content active\" data-lang=\"js\">\n<pre><code class=\"language-javascript\">\nvar dailyTemperatures = function(arr) {\n    let stack = [];\n    let n = arr.length;\n    let ans = Array(n).fill(0);\n\n    stack.push(n-1);\n    for(let i = n-2; i >= 0; i--){\n        while(stack.length) {\n            let top = stack[stack.length-1];\n            if(arr[i] >= arr[top]) {\n                stack.pop();\n            } else {\n                ans[i] = top - i;\n                break;\n            }\n        }\n        stack.push(i);\n    }\n    return ans;\n};\n<\/code>\n<\/pre>\n<\/div>\n\n    <div class=\"wp_blog_code-tab-content\" data-lang=\"py\">\n        <pre><code class=\"language-python\">\ndef dailyTemperatures(arr):\n    n = len(arr)\n    ans = [0] * n\n    stack = []\n\n    stack.append(n - 1)\n    for i in range(n - 2, -1, -1):\n        while stack:\n            top = stack[-1]\n            if arr[i] >= arr[top]:\n                stack.pop()\n            else:\n                ans[i] = top - i\n                break\n        stack.append(i)\n    return ans\n    <\/code><\/pre>\n    <\/div>\n    <div class=\"wp_blog_code-tab-content\" data-lang=\"java\">\n        <pre><code class=\"language-java\">\nimport java.util.Stack;\nclass Solution {\n    public int[] dailyTemperatures(int[] arr) {\n        int n = arr.length;\n        int[] ans = new int[n];\n        Stack<Integer> stack = new Stack<>();       \n        stack.push(n - 1);\n        for (int i = n - 2; i >= 0; i--) {\n            while (!stack.isEmpty()) {\n                int top = stack.peek();\n                if (arr[i] >= arr[top]) {\n                    stack.pop();\n                } else {\n                    ans[i] = top - i;\n                    break;\n                }\n            }\n            stack.push(i);\n        }\n        return ans;\n    }\n}\n <\/code><\/pre>\n    <\/div>\n    <div class=\"wp_blog_code-tab-content\" data-lang=\"cpp\">\n        <pre><code class=\"language-cpp\">\n#include &lt;vector&gt;\n#include &lt;stack&gt;\nusing namespace std;\n\nvector<int> dailyTemperatures(vector<int>& arr) {\n    int n = arr.size();\n    vector<int> ans(n, 0);\n    stack<int> s;  \n    s.push(n - 1);\n    for (int i = n - 2; i >= 0; i--) {\n        while (!s.empty()) {\n            int top = s.top();\n            if (arr[i] >= arr[top]) {\n                s.pop();\n            } else {\n                ans[i] = top - i;\n                break;\n            }\n        }\n        s.push(i);\n    }\n    return ans;\n}\n<\/code><\/pre>\n    <\/div>\n\n    <div class=\"wp_blog_code-tab-content\" data-lang=\"c\">\n        <pre><code class=\"language-c\">\n#include &lt;stdio.h&gt;\n#include &lt;stdlib.h&gt;\nint* dailyTemperatures(int* arr, int n, int* returnSize) {\n    int* ans = (int*)calloc(n, sizeof(int));\n    int* stack = (int*)malloc(n * sizeof(int));\n    int top = -1;\n\n    stack[++top] = n - 1;\n    for (int i = n - 2; i >= 0; i--) {\n        while (top >= 0) {\n            int t = stack[top];\n            if (arr[i] >= arr[t]) {\n                top--;\n            } else {\n                ans[i] = t - i;\n                break;\n            }\n        }\n        stack[++top] = i;\n    }\n    *returnSize = n;\n    free(stack);\n    return ans;\n}\n<\/code><\/pre>\n    <\/div>\n    <div class=\"wp_blog_code-tab-content\" data-lang=\"cs\">\n        <pre><code class=\"language-csharp\">\nusing System.Collections.Generic;\npublic class Solution {\n    public int[] DailyTemperatures(int[] arr) {\n        int n = arr.Length;\n        int[] ans = new int[n];\n        Stack<int> stack = new Stack<int>();\n        \n        stack.Push(n - 1);\n        for (int i = n - 2; i >= 0; i--) {\n            while (stack.Count > 0) {\n                int top = stack.Peek();\n                if (arr[i] >= arr[top]) {\n                    stack.Pop();\n                } else {\n                    ans[i] = top - i;\n                    break;\n                }\n            }\n            stack.Push(i);\n        }\n        return ans;\n    }\n}\n  <\/code><\/pre>\n    <\/div>\n<\/div>\n<\/div>\n<script>\n    document.addEventListener(\"DOMContentLoaded\", () => {\n        const buttons = document.querySelectorAll(\".wp_blog_code-tab-button\");\n        const contents = document.querySelectorAll(\".wp_blog_code-tab-content\");\n\n        buttons.forEach((button) => {\n            button.addEventListener(\"click\", () => {\n                const lang = button.getAttribute(\"data-lang\");\n                buttons.forEach((btn) => btn.classList.remove(\"active\"));\n                contents.forEach((content) =>\n                    content.classList.remove(\"active\")\n                );\n                button.classList.add(\"active\");\n                document\n                    .querySelector(\n                        `.wp_blog_code-tab-content[data-lang=\"${lang}\"]`\n                    )\n                    .classList.add(\"active\");\n            });\n        });\n    });\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Problem Statement: Given an array of integers temperatures represents the daily temperatures, return an array answer such that answer[i] is the number of days you have to wait after the ith day to get a warmer temperature. If there is no future day for which this is possible, keep answer[i] == 0 instead. Examples: Example<\/p>\n","protected":false},"author":108,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[210,322,176,175,211,174,172,173],"tags":[],"class_list":{"0":"post-7758","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-algorithms","7":"category-algorithms-and-data-structures","8":"category-csharp","9":"category-cplusplus","10":"category-data-structures","11":"category-java","12":"category-javascript","13":"category-python"},"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/posts\/7758","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/users\/108"}],"replies":[{"embeddable":true,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/comments?post=7758"}],"version-history":[{"count":2,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/posts\/7758\/revisions"}],"predecessor-version":[{"id":7760,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/posts\/7758\/revisions\/7760"}],"wp:attachment":[{"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/media?parent=7758"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/categories?post=7758"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/tags?post=7758"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}