Submission #1065523

#	Time	Username	Problem	Language	Result	Execution time	Memory
1065523		CodeLakVN	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	135 ms	88916 KiB

joi2019_ho_t1

#include <bits/stdc++.h>

#define no "NO"
#define yes "YES"
#define F first
#define S second
#define vec vector
#define task "main"
#define ll long long
#define _mp make_pair
#define ii pair<int, int>
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define evoid(val) return void(std::cout << val)
#define FOR(i, a, b) for(int i = (a); i <= (b); ++i)
#define FOD(i, b, a) for(int i = (b); i >= (a); --i)
#define unq(x) sort(all(x)); x.resize(unique(all(x)) - x.begin())

using namespace std;

template<typename U, typename V> bool maximize(U &a, V b) {
    if (a < b) { a = b; return 1; } return 0;
}
template<typename U, typename V> bool minimize(U &a, V b) {
    if (a > b) { a = b; return 1; } return 0;
}

const int N = (int)3e3 + 9;
const int INF = (int)1e9;
const int MOD = (int)1e9 + 7;

int numRow, numCol;
string a[N];
int cntO[N][N], cntI[N][N];

void main_code() {
    cin >> numRow >> numCol;
    FOR(i, 1, numRow) {
        cin >> a[i];
        a[i] = " " + a[i];
    }

    FOR(i, 1, numRow) FOD(j, numCol, 1) cntO[i][j] = cntO[i][j + 1] + (a[i][j] == 'O');
    FOR(j, 1, numCol) FOD(i, numRow, 1) cntI[i][j] = cntI[i + 1][j] + (a[i][j] == 'I');

    ll ans = 0;
    FOR(i, 1, numRow) FOR(j, 1, numCol) if (a[i][j] == 'J')
        ans += 1LL * cntO[i][j + 1] * cntI[i + 1][j];
    cout << ans;
}

int main() {
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    if (fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    const bool MULTITEST = 0;
    int num_test = 1; if (MULTITEST) cin >> num_test;
    while (num_test--) { main_code(); cout << "\n"; }
}

/* Lak lu theo dieu nhac */

Compilation message (stderr)

joi2019_ho_t1.cpp: In function 'int main()':
joi2019_ho_t1.cpp:55:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
joi2019_ho_t1.cpp:56:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   56 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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