自己尝试运行了，答案和标准答案是一样的，但为什么却没过？

以下为源代码：

#include<iostream>
#include<cstring>
#include<cstdio>
using namespace std;
int main() {
    #ifndef ONLINE_JUDGE
        freopen("123.in", "r", stdin);
        freopen("123.out", "w", stdout);
    #endif
    int n, ans = 0, cnt;
    string s, word;
    scanf("%d\n", &n);
    getline(cin, s);
    cnt = s.find("VK");
    if (cnt == -1) {
        for (int i = 0; i < n; i++){
        if (s[i] == s[i + 1]) {
                cout << 1 <<endl;
                return 0;
            }else {
                cout << 0 << endl;
                return 0;
            }
        }
    }
    while (cnt != -1) {
        ans++;
        cnt = s.find("VK", cnt + 1);
    }
    while (cnt == -1) {
            int a = s.find("VV", a + 1);
            int b = s.find("KK", b + 1);
            if (a != -1) {
                s[a + 1] -= 11;
                int ans1 = 0, c = s.find("VK");
                while (c != -1){
                    ans1++;
                    c = s.find("VK", c + 1);
                if (ans1 > ans) {
                    cout << ans1 <<endl;
                    return 0;
                    }
                }
                s[a + 1] += 11;
            }
            if (b != -1) {
                s[b] += 11;
                int ans2 = 0, d = s.find("VK");
                while (d != -1){
                    ans2++;
                    d = s.find("VK", d + 1);
                if (ans2 > ans) {
                    cout << ans2 <<endl;
                    return 0;
                    }
                }
                s[b] -= 11;
            }
        if (a == -1 && b == -1) {
            cout << ans <<endl;
            return 0;
            }
        }
    return 0;
}