Submission #221936

#	Time	Username	Problem	Language	Result	Execution time	Memory
221936		mhy908	스탬프 수집 (JOI16_ho_t2)	C++14	100 / 100	9 ms	3712 KiB

2016_ho_t2

#include <bits/stdc++.h>
using namespace std;
typedef long long LL;
int n;
char str[100010];
LL J[100010], JO[100010], OI[100010], I[100010], ans, ans2;
int main(){
    scanf("%d %s", &n, str+1);
    for(int i=1; i<=n; i++){
        J[i]=J[i-1], JO[i]=JO[i-1];
        if(str[i]=='J')J[i]++;
        if(str[i]=='O')JO[i]+=J[i];
        if(str[i]=='I')ans+=JO[i];
    }
    for(int i=n; i>=1; i--){
        I[i]=I[i+1], OI[i]=OI[i+1];
        if(str[i]=='I')I[i]++;
        if(str[i]=='O')OI[i]+=I[i];
    }
    for(int i=1; i<=n+1; i++){
        LL tmp=max(max(OI[i], JO[i-1]), J[i-1]*I[i]);
        ans2=max(ans2, tmp);
    }
    printf("%lld", ans+ans2);
}

Compilation message (stderr)

2016_ho_t2.cpp: In function 'int main()':
2016_ho_t2.cpp:8:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %s", &n, str+1);
     ~~~~~^~~~~~~~~~~~~~~~~~~~

• Subtask 1: 30 / 30
• Subtask 2: 20 / 20
• Subtask 3: 50 / 50