Submission #156048

#	Time	Username	Problem	Language	Result	Execution time	Memory
156048		souhhcong	JOIOJI (JOI14_joioji)	C++14	100 / 100	67 ms	8072 KiB

joioji

#include <iostream>
#include <map>
#include <stdio.h>
#include <string.h>
using namespace std;

#define cnt_I first
#define cnt_O second.first
#define cnt_J second.second
typedef pair<int,int> ii;
typedef pair<int,ii> iii;
const int N = 2e5+5;
int n, ans = 0;
string s;
iii pref[N];
map<iii,int> check;

int main()
{
    cin >> n >> s;
    if (s[0] == 'I') pref[0].cnt_I++;
    else if (s[0] == 'O') pref[0].cnt_O++;
    else pref[0].cnt_J++;
    check[pref[0]] = 1;
    for (int i = 1; i < n; i++)
    {
        pref[i] = pref[i-1];
        if (s[i] == 'I') pref[i].cnt_I++;
        else if (s[i] == 'O') pref[i].cnt_O++;
        else pref[i].cnt_J++;
        int tmp = min(pref[i].cnt_I,min(pref[i].cnt_O,pref[i].cnt_J));
        pref[i].cnt_I -= tmp;
        pref[i].cnt_O -= tmp;
        pref[i].cnt_J -= tmp;
        if (!pref[i].cnt_I && !pref[i].cnt_O && !pref[i].cnt_J)
            ans = max(ans,i+1);
        else if (check[pref[i]])
        {
            ans = max(ans,i+1-check[pref[i]]);
        }
        else
            check[pref[i]] = i+1;
    }
    cout << ans;
}

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