Submission #97434

#	Time	Username	Problem	Language	Result	Execution time	Memory
97434		aer0park	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	516 ms	150544 KiB

joi2019_ho_t1

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

ll n,m,no[3004][3004],ni[3004][3004],anw;
vector<string> ar;

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(NULL);
	cin>>n>>m;
	for(int i=0;i<n;i++)
	{
		string a;cin>>a;
		ar.push_back(a);
	}
	for(int i=0;i<n;i++)
	{
		ll sum=0;
		for(int j=m-1;j>=0;j--)
		{
			if(ar[i][j]=='O')
				sum++;
			no[i][j]=sum;
		}
	}
	for(int i=0;i<m;i++)
	{
		ll sum=0;
		for(int j=n-1;j>=0;j--)
		{
			if(ar[j][i]=='I')
				sum++;
			ni[j][i]=sum;
		}
	}
	for(int i=0;i<n;i++)
		for(int j=0;j<m;j++)
			if(ar[i][j]=='J')
				anw+=ni[i][j]*no[i][j];
	cout<<anw;
	return 0;
}

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