Submission #154200

#	Time	Username	Problem	Language	Result	Execution time	Memory
154200		ivandasfs	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	173 ms	88460 KiB

joi2019_ho_t1

#include <iostream>
#include <cstdio>

using namespace std;

char a[3005][3005];

int red[3005][3005];
int stu[3005][3005];

int main() {
	int n,m;
	scanf("%d%d", &n, &m);
	for (int i=0 ; i<n ; i++) {
		scanf("%s", a[i]);
	}
	long long sol = 0;
	for (int i=n-1 ; i>=0 ; i--) {
		for (int j=m-1 ; j>=0 ; j--) {
			red[i][j] = red[i][j+1] + (a[i][j] == 'O');
			stu[i][j] = stu[i+1][j] + (a[i][j] == 'I');
			if (a[i][j] == 'J') sol += red[i][j] * stu[i][j];
		}
	}
	printf("%lld\n", sol);
	return 0;
}

Compilation message (stderr)

joi2019_ho_t1.cpp: In function 'int main()':
joi2019_ho_t1.cpp:13:7: 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:15:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%s", a[i]);
   ~~~~~^~~~~~~~~~~~

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