蔡徐坤

include <bits/stdc++.h>

using namespace std; int a[300]; int main() {

int n, cnt = 0, s = 0;
char ch;
string str;
cin >> n;
cin >> str;

for (int i = 0; i < str.length(); i++) {
    ch = str[i];
    if (a[ch] == 0) {
        if (s < n) {
            s++, a[ch] = 1;
        } else {
            cnt++;
            a[ch] = 2;
        }
    } else if (a[ch] == 1) {
        s--;
    }

} cout << cnt;

return 0; }

评论:

王子骁 • 1年前

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chenjun • 1年前