/*
 * @lc app=leetcode.cn id=2283 lang=cpp
 *
 * [2283] 判断一个数的数字计数是否等于数位的值
 */

#include <bits/stdc++.h>
using namespace std;

// @lc code=start
class Solution {
public:
    bool digitCount(string num) {
        vector<int> memo(num.size() + 1, 0);
        for (int i = 0; i < num.size(); ++i) {
            if (num[i] - '0' > num.size()) return false;
            ++memo[num[i] - '0'];
        }
        for (int i = 0; i < num.size(); ++i) {
            if (memo[i] != num[i] - '0') return false;
        }
        return true;
    }
};
// @lc code=end