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难度:简单 来源:剑指 Offer 58 - II
字符串的左旋转操作是把字符串前面的若干个字符转移到字符串的尾部。请定义一个函数实现字符串左旋转操作的功能。比如,输入字符串 abcdefg 和数字 2 ,该函数将返回左旋转两位得到的结果 cdefgab。
abcdefg
cdefgab
示例 1:
输入: s = "abcdefg", k = 2 输出: "cdefgab"
示例 2:
输入: s = "lrloseumgh", k = 6 输出: "umghlrlose"
限制:
1 <= k < s.length <= 10000
题解一:字符串切片
/** * @param {string} s * @param {number} n * @return {string} */ var reverseLeftWords = function(s, n) { return (s + s).substr(n, s.length) };
题解二:遍历+余数
/** * @param {string} s * @param {number} n * @return {string} */ var reverseLeftWords = function(s, n) { let res = [] for(let i = n, l = n + s.length; i < l; i++) { res.push(s.charAt( i % s.length )) } return res.join('') };
The text was updated successfully, but these errors were encountered:
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左旋转字符串
难度:简单
来源:剑指 Offer 58 - II
字符串的左旋转操作是把字符串前面的若干个字符转移到字符串的尾部。请定义一个函数实现字符串左旋转操作的功能。比如,输入字符串
abcdefg
和数字 2 ,该函数将返回左旋转两位得到的结果cdefgab
。示例 1:
示例 2:
限制:
题解一:字符串切片
题解二:遍历+余数
The text was updated successfully, but these errors were encountered: