Submission #1332509

#	Time	Username	Problem	Language	Result	Execution time	Memory
1332509		retarde	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	425 ms	212160 KiB

joi2019_ho_t1

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

#define pb push_back
#define pf push_front
#define mp make_pair
#define fi first
#define se second
#define int long long
#define all(x) (x).begin(), (x).end()

typedef long double ld;
typedef long long ll;
typedef pair<ll,ll> pll;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<bool> vb;
typedef vector<vector<int>> vvi;
typedef vector<vector<bool>> vvb;
typedef vector<vector<ll>> vvll;
typedef vector<string> vs;
typedef vector<vector<string>> vvs;
typedef vector<char> vc;
typedef vector<vector<char>> vvc;
typedef map<int, int> mii;
typedef unordered_map<int, int> umii;

const int mod = 1e9 + 7;
const int inf = INTMAX_MAX;
const bool tc = false;

inline void solve() {
    int h, w;
    cin >> h >> w;
    vvi g(h, vi(w));
    for (int i = 0; i < h; i++) {
        for (int j = 0; j < w; j++) {
            char x; cin >> x;
            g[i][j] = (x == 'J' ? 1 : (x == 'I' ? 2 : 3));
        }
    }

    vvi osuf(h, vi(w));
    for (int i = 0; i < h; i++) {
        osuf[i][w - 1] = (g[i][w - 1] == 3);
        for (int j = w - 2; j >= 0; j--) osuf[i][j] = osuf[i][j + 1] + (g[i][j] == 3);
    }
    vvi isuf(h, vi(w));
    for (int c = 0; c < w; c++) {
        isuf[h - 1][c] = (g[h - 1][c] == 2);
        for (int y = h - 2; y >= 0; y--) isuf[y][c] = isuf[y + 1][c] + (g[y][c] == 2);
    }

    int ans = 0;
    for (int i = 0; i < h - 1; i++) {
        for (int j = 0; j < w - 1; j++) {
            if (g[i][j] == 1) ans += isuf[i][j] * osuf[i][j];
        }
    }
    cout << ans << '\n';
}

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

signed main() {
    ios::sync_with_stdio(false);
    cout.tie(0);
    cin.tie(0);
    //setIO();

    int t = 1;
    if (tc) {
        cin >> t;
    }

    while (t--) {
        solve();
    }
}

Compilation message (stderr)

joi2019_ho_t1.cpp: In function 'void setIO(std::string)':
joi2019_ho_t1.cpp:65:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
joi2019_ho_t1.cpp:66:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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