Submission #110350

#	Time	Username	Problem	Language	Result	Execution time	Memory
110350		sams	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	966 ms	151296 KiB

joi2019_ho_t1

#include <bits/stdc++.h>

using namespace std;

const int maxn = 3e3+10;

int h, w;
char mat[maxn][maxn];
long long sumO[maxn][maxn], sumI[maxn][maxn];

int main()
{
	cin >> h >> w;

	for(int i = 1 ; i <= h ; ++i)
		for(int j = 1 ; j <= w; ++j)
			cin >> mat[i][j];

	// make a sum of eche O
	for(int i = 1 ; i <= h ; ++i)
	{
		for(int j = 1 ; j <= w; ++j)
		{
			sumO[i][j] = sumO[i][j - 1];
			if(mat[i][j] == 'O') 
				sumO[i][j]++;
		}
	}

	for(int i = 1 ; i <= w ; ++i)
	{
		for(int j = 1 ; j <= h; ++j)
		{
			sumI[j][i] = sumI[j - 1][i];
			if(mat[j][i] == 'I') 
				sumI[j][i]++;
		}
	}

	long long resp = 0;
	for(int i = 1 ; i <= h ; ++i)
	{
		for(int j = 1 ; j <= w; ++j)
		{	
			if(mat[i][j] == 'J')
			{

				long long O = sumO[i][w] - sumO[i][j];
				long long I = sumI[h][j] - sumI[i - 1][j];

				//cout <<  i << " " << j << " " << O << " " << I << "\n" ;
				resp += (O*I);
			}
		}
	}
	cout << resp << "\n";
	/*for(int i = 1 ; i <= h ; ++i)
	{
		for(int j = 1 ; j <= w; ++j)
		{
			cout << sumO[i][j] <<" ";
		}
		cout << "\n";
	}
		cout << "\n";

	for(int i = 1 ; i <= h ; ++i)
	{
		for(int j = 1 ; j <= w; ++j)
		{
			cout << sumI[i][j] <<" ";
		}
		cout << "\n";
	}*/
	return 0;
}

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