Submission #20801

#	Time	Username	Problem	Language	Result	Execution time	Memory
20801		jjwdi0	JOIOJI (JOI14_joioji)	C++11	100 / 100	43 ms	7896 KiB

joioji

#include <bits/stdc++.h>
using namespace std;
typedef pair<int, int> pr;

int N, J, O, ans;
char A[200005];
map<pr, int> m;

int main() {
    scanf("%d %s", &N, A);
    m[pr(0, 0)] = -1;
    for(int i=0; i<N; i++) {
        if(A[i] == 'J') J++;
        if(A[i] == 'O') O++;
        if(A[i] == 'I') J--, O--;
        if(m.find(pr(J, O)) != m.end()) ans = max(ans, i - m[pr(J, O)]);
        else m[pr(J, O)] = i;
    }
    printf("%d\n", ans);
}

Compilation message (stderr)

joioji.cpp: In function 'int main()':
joioji.cpp:10:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %s", &N, A);
                          ^

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