Submission #100752

#	Time	Username	Problem	Language	Result	Execution time	Memory
100752		ikura355	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	251 ms	88440 KiB

joi2019_ho_t1

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

const int maxn = 3e3 + 5;

int n,m;
char s[maxn][maxn];
long long a[maxn][maxn];

int main() {
	//freopen("in.txt","r",stdin);
	//freopen("out.txt","w",stdout);
	scanf("%d%d",&n,&m);
	for(int i=1;i<=n;i++) scanf(" %s",s[i]+1);
	for(int i=1;i<=n;i++) {
		int cnt = 0;
		for(int j=m;j>=1;j--) {
			cnt += s[i][j]=='O';
			a[i][j] = cnt;
		}
	}
	long long ans = 0;
	for(int j=1;j<=m;j++) {
		int cnt = 0;
		for(int i=n;i>=1;i--) {
			cnt += s[i][j]=='I';
			if(s[i][j]=='J') ans += (long long)cnt * a[i][j];
		}
	}
	printf("%lld",ans);
}

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:14:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=1;i<=n;i++) scanf(" %s",s[i]+1);
                        ~~~~~^~~~~~~~~~~~~~

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