Submission #922227

#	Time	Username	Problem	Language	Result	Execution time	Memory
922227		Aiperiii	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	312 ms	159828 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define int long long
#define ff first
#define ss second
#define pb push_back
#define all(x) x.begin(),x.end()
using namespace std;
const int N=3005;
char a[N][N];
int cntO[N][N],cntI[N][N];
signed main(){
   ios_base::sync_with_stdio();
   cin.tie(0);cout.tie(0);
   int h,w;
   cin>>h>>w;
   char a[h][w];
   for(int i=0;i<h;i++){
      for(int j=0;j<w;j++){
         cin>>a[i][j];
      }
   }
   for(int i=0;i<h;i++){
      int cnt=0;
      for(int j=w-1;j>=0;j--){
         if(a[i][j]=='O')cnt++;
         cntO[i][j]=cnt;
      }
   }
   for(int i=0;i<w;i++){
      int cnt=0;
      for(int j=h-1;j>=0;j--){
         if(a[j][i]=='I')cnt++;
         cntI[j][i]=cnt;
      }
   }
   int ans=0;
   for(int i=0;i<h;i++){
      for(int j=0;j<w;j++){
         if(a[i][j]=='J')ans+=cntI[i][j]*cntO[i][j];
      }
   }
   cout<<ans<<"\n";
}

/*
3 4
JOIJ
JIOO
IIII
4 4
JJOO
JJOO
IIJO
IIIJ
 */

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