Submission #171280

#	Time	Username	Problem	Language	Result	Execution time	Memory
171280		dennisstar	Bitaro the Brave (JOI19_ho_t1)	C++11	100 / 100	242 ms	88712 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define fi first
#define se second
#define ryan bear
#define all(V) ((V).begin()), ((V).end())
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef long double ld;
typedef vector<int> vim;
typedef vector<ll> vlm;

int H, W;
char ar[3010][3010];
int c1[3010][3010], c2[3010][3010];
ll ans;

int main() {
	scanf("%d %d", &H, &W);
	for (int i=0; i<H; i++) {
		scanf("%s", ar[i]);
		for (int j=W-1; j>=0; j--) {
			c1[i][j]=c1[i][j+1];
			if (ar[i][j+1]=='O') c1[i][j]++;
		}
	}
	for (int i=H-1; i>=0; i--) {
		for (int j=0; j<W; j++) {
			c2[i][j]=c2[i+1][j];
			if (ar[i+1][j]=='I') c2[i][j]++;
			if (ar[i][j]=='J') ans+=(ll)c1[i][j]*c2[i][j];
		}
	}
	printf("%lld\n", ans);
	return 0;
}

Compilation message (stderr)

joi2019_ho_t1.cpp: In function 'int main()':
joi2019_ho_t1.cpp:20:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &H, &W);
  ~~~~~^~~~~~~~~~~~~~~~~
joi2019_ho_t1.cpp:22:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%s", ar[i]);
   ~~~~~^~~~~~~~~~~~~

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