Submission #1023572

#	Time	Username	Problem	Language	Result	Execution time	Memory
1023572		vjudge1	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	202 ms	79704 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define eb emplace_back
#define task ""
#define fast ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define nx freopen (task".inp","r",stdin), freopen (task".out","w",stdout);
#define fi first
#define se second
#define pii pair <int, int>
#define tii tuple <int, int, int>
#define all(s) s.begin(), s.end()
using namespace std;

const int nmax = 3e3 + 2;
int h, w;
char s[nmax][nmax];

int cntO[nmax][nmax], cntI[nmax][nmax];

int main()
{
    if (ifstream(task".inp")) nx
    fast

    cin >> h >> w;
    for (int i = 1; i <= h; ++i)
        for (int j = 1; j <= w; ++j)
            cin >> s[i][j];
    
    for (int i = 1; i <= h; ++i)
        for (int j = w; j >= 1; --j)
            cntO[i][j] = cntO[i][j + 1] + (s[i][j] == 'O');
        
    for (int j = 1; j <= w; ++j)
        for (int i = h; i >= 1; --i)
            cntI[j][i] = cntI[j][i + 1] + (s[i][j] == 'I');

    ll ans = 0;
    for (int i = 1; i <= h; ++i)
        for (int j = 1; j <= w; ++j)
            if (s[i][j] == 'J')
                ans += cntO[i][j] * cntI[j][i];
                
    cout << ans;
}

Compilation message (stderr)

joi2019_ho_t1.cpp: In function 'int main()':
joi2019_ho_t1.cpp:7:20: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    7 | #define nx freopen (task".inp","r",stdin), freopen (task".out","w",stdout);
      |            ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
joi2019_ho_t1.cpp:23:31: note: in expansion of macro 'nx'
   23 |     if (ifstream(task".inp")) nx
      |                               ^~
joi2019_ho_t1.cpp:7:52: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    7 | #define nx freopen (task".inp","r",stdin), freopen (task".out","w",stdout);
      |                                            ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
joi2019_ho_t1.cpp:23:31: note: in expansion of macro 'nx'
   23 |     if (ifstream(task".inp")) nx
      |                               ^~

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