Submission #120212

#	Time	Username	Problem	Language	Result	Execution time	Memory
120212		dantoh000	JOIOJI (JOI14_joioji)	C++14	95 / 100	32 ms	3948 KiB

joioji

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
unordered_map<ll,int> m;
ll f(int x, int y){
    return (x<<17)^y;
}
int main(){
    int n;
    scanf("%d",&n);
    int ans = 0;
    int a, b;
    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("%d",ans);

}

Compilation message (stderr)

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("%d",&n);
     ~~~~~^~~~~~~~~
joioji.cpp:15:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf(" %c",&x);
         ~~~~~^~~~~~~~~~
joioji.cpp:17:19: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
             a++; b++;
                  ~^~
joioji.cpp:17:14: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]
             a++; b++;
             ~^~

• Subtask 1: 0 / 5
• Subtask 2: 15 / 15
• Subtask 3: 80 / 80