JOI Problem Testcases broken on Oj.UZ

Hello guyz, Today I was solving Japan 2014 IOI National Team Selection Camp Day 3 Problem Problem 1 on OJ.UZ and was shocked that I somehow managed to get 95 points where the subtasks are:

Subtasks

My First Code

#include <iostream>
#include <algorithm>
#include <cmath>
#include <vector>
#include <string>
#include <set>
#include <unordered_set>
#include <map>
#include <unordered_map>
#include <queue>
#include <stack>
#include <iomanip>
#include <ios>
#include <cstdint>
#include <array>
#include <deque>
#include <numeric>

using namespace std;
 
#define MyFast ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)
#define int long long

constexpr long long N = 21;
constexpr long long MOD = 1e9 + 7;

void solve()
{
    int n;
    cin >> n;
    string s;
    cin >> s;

    vector <int> ans(n + 1);
    map <int, int> mp;

    int O = 0, I = 0, J = 0, fi = 0;

    for(int i = 0 ; i < n ; ++i)
    {
        if(s[i] == 'J')
        {
            J ++;
        }
        if(s[i] == 'I')
        {
            I ++;
        }
        if(s[i] == 'O')
        {
            O ++;
        }
        int temp = min(J, min(O, I));
        J -= temp;
        O -= temp;
        I -= temp;
        ans[i + 1] = temp + ans[i];

        if(mp[J + O * n + I * n * n])
        {
            fi = max(fi, ans[i + 1] - ans[mp[J + O * n + I * n * n]]);
        }
        else
        {
            mp[J + O * n + I * n * n] = i + 1;
        }
    }
    cout << 3 * fi << endl;
}

signed main()
{
    MyFast;
    int t = 1;
    //cin >> t;
        
    while (t--)
    {
        solve();
    }
}

It somehow gave me 95 points while this is one of the obvious cases where it will fail:

INPUT
6
JOIJOI

OUTPUT
3
EXPECTED OUTPUT
6

Afterwards I wanted to report this and looked for a place where I can give edge cases but found none on the website so if anyone knows it please let me know. And if any of the staff of JOI or OJ.UZ reads this blog please fix it.

UPD : I Found ojuz, so please fix it because it is causing so much problem as in our series of contests this puts ranks to unfair level.

#	User	Rating
1	Benq	3676
2	Kevin114514	3659
3	jiangly	3640
4	turmax	3450
5	tourist	3408
6	strapple	3360
7	Um_nik	3354
8	squareOf105	3348
9	maroonrk	3312
10	idontwannadothis…e	3191

#	User	Contrib.
1	Qingyu	155
2	nik_exists	151
3	maspy	149
4	AmShZ	145
5	Um_nik	143
6	Errichto	139
7	BledDest	136
8	adamant	135
9	maroonrk	132
10	cry	130

JonKhan's blog