题解 | 记数问题
记数问题
https://www.nowcoder.com/practice/28b2d9f2bf2c48de94a1297ed90e1732
#include <iostream>
#include<string>
using namespace std;
int main() {
int n;
char x;
cin >> n;
cin >> x;
string a;
int num = 0;
for (int i = 1; i <= n; i++) {
a = to_string(i);
for (char j : a) {
if (j == x) num++;
}
}
cout << num;
}
运用了字符串的知识
