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题目：

题解：

class Solution {
public:int compress(vector<char>& chars) {int n = chars.size();int write = 0, left = 0;for (int read = 0; read < n; read++) {if (read == n - 1 || chars[read] != chars[read + 1]) {chars[write++] = chars[read];int num = read - left + 1;if (num > 1) {int anchor = write;while (num > 0) {chars[write++] = num % 10 + '0';num /= 10;}reverse(&chars[anchor], &chars[write]);}left = read + 1;}}return write;}
};