{"id":7473,"date":"2025-07-02T14:48:39","date_gmt":"2025-07-02T09:18:39","guid":{"rendered":"https:\/\/namastedev.com\/blog\/?p=7473"},"modified":"2025-07-02T14:48:39","modified_gmt":"2025-07-02T09:18:39","slug":"length-of-last-word-approach-1-two-loops","status":"publish","type":"post","link":"https:\/\/namastedev.com\/blog\/length-of-last-word-approach-1-two-loops\/","title":{"rendered":"Length of Last Word &#8211; Approach 1 &#8211; Two Loops"},"content":{"rendered":"\n<!-- Prism.js CSS and JS -->\n<link href=\"https:\/\/cdn.jsdelivr.net\/npm\/prismjs@1.29.0\/themes\/prism-tomorrow.css\" rel=\"stylesheet\" \/>\n<script src=\"https:\/\/cdn.jsdelivr.net\/npm\/prismjs@1.29.0\/prism.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_code-tabs-container {\n    font-family: \"Segoe UI\", sans-serif !important;\n    max-width: 900px !important;\n    margin: 2rem auto !important;\n    border: 1px solid #ddd !important;\n    border-radius: 8px !important;\n    overflow: hidden !important;\n    background-color: white !important;\n  }\n\n  .wp_blog_code-tabs-header {\n    background: #f7f7f7 !important;\n    display: flex !important;\n    border-bottom: 1px solid #ddd !important;\n  }\n\n  .wp_blog_code-tab-button {\n    flex: 1 !important;\n    padding: 10px 15px !important;\n    border: none !important;\n    background: transparent !important;\n    cursor: pointer !important;\n    font-weight: bold !important;\n    transition: background 0.2s !important;\n    color: #242b33 !important;\n  }\n\n  .wp_blog_code-tab-button.active {\n    background: white !important;\n    border-bottom: 3px solid #0073aa !important;\n  }\n\n  .wp_blog_code-tab-content {\n    display: none !important;\n    padding: 20px !important;\n    background: #242b33 !important;\n  }\n\n  .wp_blog_code-tab-content > pre {\n    background: #242b33 !important;\n  }\n\n  .wp_blog_code-tab-content.active {\n    display: block !important;\n  }\n\n  .wp_blog_code-tab-content pre {\n    margin: 0 !important;\n    overflow-x: auto !important;\n  }\n\n  .wp_blog_explanation {\n    max-width: 900px !important;\n    margin: 2rem auto !important;\n    font-family: \"Segoe UI\", sans-serif !important;\n    line-height: 1.6 !important;\n    background: white !important;\n    color: black !important;\n    padding: 1rem !important;\n    border-radius: 8px !important;\n  }\n\n  .wp_blog_explanation h2 {\n    color: #0073aa !important;\n    font-size: 1.5rem !important;\n    margin-bottom: 0.5rem !important;\n  }\n\n  .wp_blog_explanation code {\n    background: #f1f1f1 !important;\n    padding: 2px 6px !important;\n    border-radius: 4px !important;\n    font-family: monospace !important;\n  }\n\n  .wp_blog_explanation h1,\n  .wp_blog_explanation h2,\n  .wp_blog_explanation h3,\n  .wp_blog_explanation h4,\n  .wp_blog_explanation h5,\n  .wp_blog_explanation h6,\n  .wp_blog_explanation p {\n    margin-top: 10px !important;\n    margin-bottom: 10px !important;\n  }\n<\/style>\n\n<div class=\"wp_blog_explanation\">\n  <p>This problem is about finding the length of the last word in a given string. A word is defined as a maximal substring consisting of non-space characters only.<\/p>\n\n  <h2>Steps<\/h2>\n  <ul>\n    <li>Start from the end of the string and skip any trailing spaces.<\/li>\n    <li>Once a non-space character is found, start counting until a space is encountered again.<\/li>\n    <li>The counted length is the length of the last word.<\/li>\n  <\/ul>\n\n  <h2>Dry Run<\/h2>\n  <p><strong>Input:<\/strong> <code>\"Hello World \"<\/code><\/p>\n  <ol>\n    <li>Skip trailing spaces \u2192 pointer now at index 10 (character &#8216;d&#8217;)<\/li>\n    <li>Start counting: &#8216;d&#8217;, &#8216;l&#8217;, &#8216;r&#8217;, &#8216;o&#8217;, &#8216;W&#8217; \u2192 total count = 5<\/li>\n    <li>Encounter space \u2192 stop<\/li>\n  <\/ol>\n  <p><strong>Output:<\/strong> <code>5<\/code><\/p>\n\n  <h2>Edge Case<\/h2>\n  <p><strong>Input:<\/strong> <code>\" \"<\/code> \u2192 Only spaces<\/p>\n  <p><strong>Output:<\/strong> <code>0<\/code><\/p>\n\n  <h2>Time &#038; Space Complexity<\/h2>\n  <ul>\n    <li><strong>Time Complexity:<\/strong> O(n), where n is the length of the string<\/li>\n    <li><strong>Space Complexity:<\/strong> O(1) \u2014 no extra space used<\/li>\n  <\/ul>\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\">JavaScript<\/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=\"java\">Java<\/button>\n    <button class=\"wp_blog_code-tab-button\" data-lang=\"py\">Python<\/button>\n  <\/div>\n\n  <div class=\"wp_blog_code-tab-content active\" data-lang=\"js\">\n    <pre><code class=\"language-javascript\">\nvar lengthOfLastWord = function (s) {\n  let n = s.length - 1\n  while (n>=0) {\n      if (s[n] === ' ') {\n          --n;\n      } else {\n          break;\n      }\n  }\n  let count = 0\n  while (n >= 0) {\n      if (s[n] != \" \") {\n          --n;\n          ++count;\n      }\n      else {\n          break\n      }\n  }\n  return count;\n};\n    <\/code><\/pre>\n  <\/div>\n\n  <div class=\"wp_blog_code-tab-content\" data-lang=\"cpp\">\n    <pre><code class=\"language-cpp\">\n#include &lt;string&gt;\nusing namespace std;\n  \nint lengthOfLastWord(string s) {\n    int n = s.length() - 1;\n    while (n >= 0 && s[n] == ' ') {\n        --n;\n    }\n    int count = 0;\n    while (n >= 0 && s[n] != ' ') {\n        --n;\n        ++count;\n    }\n    return count;\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\nint lengthOfLastWord(char * s){\n    int n = strlen(s) - 1;\n    while (n >= 0 && s[n] == ' ') {\n        --n;\n    }\n    int count = 0;\n    while (n >= 0 && s[n] != ' ') {\n        --n;\n        ++count;\n    }\n    return count;\n}\n    <\/code><\/pre>\n  <\/div>\n\n  <div class=\"wp_blog_code-tab-content\" data-lang=\"java\">\n    <pre><code class=\"language-java\">\nimport java.util.HashMap;\n\npublic class Solution {\n    public int lengthOfLastWord(String s) {\n        int n = s.length() - 1;\n        while (n >= 0 && s.charAt(n) == ' ') {\n            --n;\n        }\n        int count = 0;\n        while (n >= 0 && s.charAt(n) != ' ') {\n            --n;\n            ++count;\n        }\n        return count;\n    }\n}\n    <\/code><\/pre>\n  <\/div>\n\n  <div class=\"wp_blog_code-tab-content\" data-lang=\"py\">\n    <pre><code class=\"language-python\">\nclass Solution:\n  def lengthOfLastWord(self, s: str) -> int:\n    n = len(s) - 1\n    while n >= 0 and s[n] == ' ':\n      n -= 1\n    count = 0\n    while n >= 0 and s[n] != ' ':\n      n -= 1\n      count += 1\n    return count\n    <\/code><\/pre>\n  <\/div>\n<\/div>\n<a href=\"https:\/\/leetcode.com\/problems\/two-sum\/description\/\" target=\"blank\">Solve this problem.<\/a>\n<script>\n  document.addEventListener(\"DOMContentLoaded\", function () {\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\n        buttons.forEach((btn) => btn.classList.remove(\"active\"));\n        button.classList.add(\"active\");\n\n        contents.forEach((content) => {\n          content.classList.toggle(\"active\", content.getAttribute(\"data-lang\") === lang);\n        });\n      });\n    });\n  });\n<\/script>\n\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This problem is about finding the length of the last word in a given string. A word is defined as a maximal substring consisting of non-space characters only. Steps Start from the end of the string and skip any trailing spaces. Once a non-space character is found, start counting until a space is encountered again.<\/p>\n","protected":false},"author":1,"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":[1],"tags":[],"class_list":["post-7473","post","type-post","status-publish","format-standard","category-uncategorized"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/posts\/7473","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\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/comments?post=7473"}],"version-history":[{"count":1,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/posts\/7473\/revisions"}],"predecessor-version":[{"id":7474,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/posts\/7473\/revisions\/7474"}],"wp:attachment":[{"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/media?parent=7473"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/categories?post=7473"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/tags?post=7473"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}