Submission #468232

#	Time	Username	Problem	Language	Result	Execution time	Memory
468232		chirathnirodha	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	488 ms	158700 KiB

joi2019_ho_t1

//Coded by Chirath Nirodha
#include<bits/stdc++.h>
#define F first
#define S second
#define PB push_back
#define MP make_pair
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
using namespace std;
const ll mod=1e9+7;
inline void io(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
}
void solve(){
   ll h,w;cin>>h>>w;
   char arr[h][w];
   for(int i=0;i<h;i++)for(int j=0;j<w;j++)cin>>arr[i][j];
   ll hor[h][w];
   ll ver[h][w];
   for(int i=0;i<h;i++){
	   if(arr[i][w-1]=='O')hor[i][w-1]=1;
	   else hor[i][w-1]=0;
	   for(int j=w-2;j>=0;j--){
		   hor[i][j]=hor[i][j+1];
		   if(arr[i][j]=='O')hor[i][j]++;
	   }
   }
   for(int j=0;j<w;j++){
	   if(arr[h-1][j]=='I')ver[h-1][j]=1;
	   else ver[h-1][j]=0;
	   for(int i=h-2;i>=0;i--){
		   ver[i][j]=ver[i+1][j];
		   if(arr[i][j]=='I')ver[i][j]++;
	   }
   }
   ll ans=0;
   for(int i=0;i<h-1;i++){
	   for(int j=0;j<w-1;j++){
		   if(arr[i][j]!='J')continue;
		   ans+=hor[i][j+1]*ver[i+1][j];
	   }
   }
   cout<<ans<<endl;
}
int main(){
    io();
	solve();
	//int t;cin>>t;for(int i=0;i<t;i++)solve();
    return 0;
}

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