Submission #1249272

#	Time	Username	Problem	Language	Result	Execution time	Memory
1249272		tvgk	JOIOJI (JOI14_joioji)	C++20	100 / 100	29 ms	6196 KiB

joioji

#include<bits/stdc++.h>
using namespace std;
#define task "a"
#define se second
#define fi first
#define ll long long
#define ii pair<int, int>
const long mxN = 2e5 + 7;

char chr[4] = {'J', 'O', 'I'};
int cnt[4];
map<ii, int> m;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    //freopen(task".INP", "r", stdin);
    //freopen(task".OUT", "w", stdout);

    int n;
    string s;
    cin >> n;
    cin >> s;
    s = '0' + s;

    m[{0, 0}] = 0;
    int ans = 0;
    for (int i = 1; i <= n; i++)
    {
        for (int j = 0; j < 3; j++)
            cnt[j] += (chr[j] == s[i]);

        ii tmp = {cnt[0] - cnt[1], cnt[0] - cnt[2]};
        if (m.count(tmp))
            ans = max(ans, i - m[tmp]);
        else
            m[tmp] = i;
    }
    cout << ans;
}

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