Submission #994451

#	Time	Username	Problem	Language	Result	Execution time	Memory
994451		daffuwu	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	332 ms	18104 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
using namespace std;
#define fr first
#define sc second
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

long long ans;
char a[3069][3069];
int cnt[3069][2], h, w; //{idx, row/col}

int main() 
{
    int i, j;
    scanf("%d%d", &h, &w);
    for (i=1; i<=h; i++)
    {
        for (j=1; j<=w; j++) scanf(" %c", &a[i][j]);
    }
    for (i=h; i>=1; i--)
    {
        for (j=w; j>=1; j--)
        {
            if (a[i][j] == 'J') ans += 1ll*cnt[i][0]*cnt[j][1];
            else if (a[i][j] == 'O') cnt[i][0]++;
            else cnt[j][1]++;
        }
    }
    printf("%lld\n", ans);
} 

Compilation message (stderr)

joi2019_ho_t1.cpp: In function 'int main()':
joi2019_ho_t1.cpp:14:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |     scanf("%d%d", &h, &w);
      |     ~~~~~^~~~~~~~~~~~~~~~
joi2019_ho_t1.cpp:17:35: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |         for (j=1; j<=w; j++) scanf(" %c", &a[i][j]);
      |                              ~~~~~^~~~~~~~~~~~~~~~~

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