89 lines
2.7 KiB
Java
89 lines
2.7 KiB
Java
//<p>给定两个字符串形式的非负整数 <code>num1</code> 和<code>num2</code> ，计算它们的和并同样以字符串形式返回。</p>
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//
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//<p>你不能使用任何內建的用于处理大整数的库（比如 <code>BigInteger</code>）， 也不能直接将输入的字符串转换为整数形式。</p>
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//
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//<p> </p>
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//
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//<p><strong>示例 1：</strong></p>
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//
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//<pre>
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//<strong>输入：</strong>num1 = "11", num2 = "123"
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//<strong>输出：</strong>"134"
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//</pre>
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//
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//<p><strong>示例 2：</strong></p>
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//
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//<pre>
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//<strong>输入：</strong>num1 = "456", num2 = "77"
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//<strong>输出：</strong>"533"
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//</pre>
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//
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//<p><strong>示例 3：</strong></p>
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//
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//<pre>
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//<strong>输入：</strong>num1 = "0", num2 = "0"
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//<strong>输出：</strong>"0"
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//</pre>
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//
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//<p> </p>
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//
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//<p> </p>
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//
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//<p><strong>提示：</strong></p>
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//
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//<ul>
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// <li><code>1 <= num1.length, num2.length <= 10<sup>4</sup></code></li>
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// <li><code>num1</code> 和<code>num2</code> 都只包含数字 <code>0-9</code></li>
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// <li><code>num1</code> 和<code>num2</code> 都不包含任何前导零</li>
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//</ul>
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//<div><div>Related Topics</div><div><li>数学</li><li>字符串</li><li>模拟</li></div></div><br><div><li>👍 541</li><li>👎 0</li></div>
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package leetcode.editor.cn;
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/**
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* Classname ${NAME}
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* Description 415:字符串相加
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* Date ${DATE} ${TIME}
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* author ${USER}
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*/
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public class AddStrings {
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public static void main(String[] args) {
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Solution solution = new AddStrings().new Solution();
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// TO TEST
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}
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//leetcode submit region begin(Prohibit modification and deletion)
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class Solution {
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public String addStrings(String num1, String num2) {
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StringBuilder str = new StringBuilder();
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StringBuilder sb1 = new StringBuilder(num1);
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StringBuilder sb2 = new StringBuilder(num2);
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sb1.reverse();
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sb2.reverse();
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int index = 0;
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int sum = 0;
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while (index < sb1.length() || index < sb2.length()) {
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if (index < sb1.length()) {
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sum += (sb1.charAt(index) - '0');
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}
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if (index < sb2.length()) {
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sum += (sb2.charAt(index) - '0');
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}
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if (sum >= 10) {
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str.insert(0, (sum % 10));
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sum /= 10;
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} else {
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str.insert(0, sum);
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sum = 0;
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}
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index++;
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}
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if (sum > 0) {
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str.insert(0, sum);
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}
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return str.toString();
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}
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}
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//leetcode submit region end(Prohibit modification and deletion)
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}
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