Submission #242359

#	Time	Username	Problem	Language	Result	Execution time	Memory
242359		michao	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	301 ms	88568 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define ll long long int
#define mp make_pair
#define pb push_back
#define ld long double
#define pii pair<int,int>
#define sz(x) (int)x.size()
#define piii pair<pii,pii>
#define precise cout<<fixed<<setprecision(10)
#define st first
#define nd second
#define ins insert
#define vi vector<int>
#define BOOST ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
using namespace std;
ll ans=0;
const int MAX=3005;
char tab[MAX][MAX];
int sufo[MAX][MAX];
int sufi[MAX][MAX];
int32_t main()
{
  BOOST;
  int n,m;
  cin>>n>>m;
  for (int i=1;i<=n;i++)
    for(int j=1;j<=m;j++)
      cin>>tab[i][j];  
  for (int i=1;i<=n;i++)
	  for (int j=m;j>=1;j--)
	    sufo[i][j]=sufo[i][j+1]+(tab[i][j]=='O');
	for (int i=1;i<=m;i++)
		for (int j=n;j>=1;j--)
			sufi[i][j]=sufi[i][j+1]+(tab[j][i]=='I');
  
  for (int i=1;i<=n;i++)
    for (int j=1;j<=m;j++)
      if (tab[i][j]=='J')
        ans+=(ll)sufo[i][j]*sufi[j][i];
  cout<<ans;
  return 0;
}

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