Submission #1297439

#	Time	Username	Problem	Language	Result	Execution time	Memory
1297439		kantaponz	JOIOJI (JOI14_joioji)	C++20	100 / 100	37 ms	7232 KiB

joioji

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

int N;
string S;
int A[200005], B[200005];

int main() {
    ios_base::sync_with_stdio(0), cin.tie(0);
    cin >> N >> S;
    map<pair<int,int>,int> mp;
    for (int i = 1; i <= N; i++) {
        char x = S[i - 1];
        if (x == 'J') {
            A[i]++;
            B[i]++;
        } else if (x == 'I') {
            A[i]--;
        } else {
            B[i]--;
        }
    }

    mp[{0, 0}] = 0;
    for (int i = 1; i <= N; i++) {
        A[i] += A[i - 1];
        B[i] += B[i - 1];
        if (mp.find({A[i], B[i]}) == mp.end()) mp[{A[i], B[i]}] = i;
    }

    

    int ans = 0;
    
    for (int i = 1; i <= N; i++) {
        ans = max(ans, i - mp[{A[i], B[i]}]);
    }
    cout << ans;
}

• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 80 / 80