Submission #50971

#	Time	Username	Problem	Language	Result	Execution time	Memory
50971		model_code	스탬프 수집 (JOI16_ho_t2)	C11	100 / 100	4 ms	1420 KiB

2016_ho_t2

#include <stdio.h>

int n;
char S[100005];
int Jsum[100005],Isum[100005];

long long max(long long a,long long b){
  if(a>b) return a;
  return b;
}

int main(){
  int i;
  scanf("%d%s",&n,S);

  for(i=0;i<n;++i){
    Jsum[i+1]=Jsum[i]+(S[i]=='J'?1:0);
    Isum[i+1]=Isum[i]+(S[i]=='I'?1:0);
  }

  long long res_O=0;
  for(i=1;i<n;++i){
    if(res_O<Jsum[i]*(long long)(Isum[n]-Isum[i])){
      res_O=Jsum[i]*(long long)(Isum[n]-Isum[i]);
    }
  }
  long long res_J=0,res_I=0;
  long long ans=0;
  for(i=0;i<n;++i) if(S[i]=='O'){
    res_J+=Isum[n]-Isum[i+1];
    res_I+=Jsum[i];
    ans+=(Isum[n]-Isum[i+1])*(long long)Jsum[i];
  }

  ans+=max(max(res_O,res_J),res_I);

  printf("%lld\n",ans);
  return 0;
}

Compilation message (stderr)

2016_ho_t2.c: In function 'main':
2016_ho_t2.c:14:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%s",&n,S);
   ^~~~~~~~~~~~~~~~~~

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