Submission #204495

#	Time	Username	Problem	Language	Result	Execution time	Memory
204495		T0p_	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	257 ms	160520 KiB

joi2019_ho_t1

#include<bits/stdc++.h>
using namespace std;

char t[3030][3030];
long long dp[2][3030][3030];

int main()
{
	int n, m;
	scanf(" %d %d",&n,&m);
	for(int i=1 ; i<=n ; i++)
		scanf(" %s",t[i]+1);
	for(int i=n ; i>=1 ; i--)
	{
		for(int j=m ; j>=1 ; j--)
		{
			if(t[i][j] == 'O') dp[0][i][j]++;
			if(t[i][j] == 'I') dp[1][i][j]++;
			dp[0][i][j] += dp[0][i][j+1];
			dp[1][i][j] += dp[1][i+1][j];
		}
	}
	long long ans = 0;
	for(int i=1 ; i<=n ; i++)
		for(int j=1 ; j<=m ; j++)
			if(t[i][j] == 'J') ans += dp[0][i][j] * dp[1][i][j];
	printf("%lld\n",ans);
	return 0;
}

Compilation message (stderr)

joi2019_ho_t1.cpp: In function 'int main()':
joi2019_ho_t1.cpp:10:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf(" %d %d",&n,&m);
  ~~~~~^~~~~~~~~~~~~~~~
joi2019_ho_t1.cpp:12:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf(" %s",t[i]+1);
   ~~~~~^~~~~~~~~~~~~~

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