제출 #120217

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
120217		dantoh000	JOIOJI (JOI14_joioji)	C++14	100 / 100	30 ms	3984 KiB

joioji

#include <bits/stdc++.h>
#define int long long
using namespace std;
unordered_map<int,int> m;
int f(int x, int y){
    return (x<<17)^y;
}
main(){
    int n;
    scanf("%lld",&n);
    int ans = 0;
    int a = 0, b= 0;
    m[0] = -1;
    for (int i = 0; i < n; i++){
        char x;
        scanf(" %c",&x);
        if (x == 'J'){
            a++; b++;
        }
        else if (x == 'O') a--;
        else if (x == 'I') b--;
        int k = f(a,b);
        if (m[k] == 0){
            m[k] = i;
        }
        else{
            ans = max(ans,i-m[k]);
        }
    }
    printf("%lld",ans);
}

컴파일 시 표준 에러 (stderr) 메시지

joioji.cpp:8:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^
joioji.cpp: In function 'int main()':
joioji.cpp:10:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld",&n);
     ~~~~~^~~~~~~~~~~
joioji.cpp:16:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf(" %c",&x);
         ~~~~~^~~~~~~~~~

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