Submission #1297376

#	Time	Username	Problem	Language	Result	Execution time	Memory
1297376		mage__	Cultivation (JOI17_cultivation)	C++17	0 / 100	1 ms	572 KiB

cultivation

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

#define fio ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define name "CONE"
#define opf freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout);
#define ll long long
#define int ll
#define ii pair<int, int>
#define fi first
#define se second
#define BIT(k) __builtin_popcount(k)
#define _ << " " <<
#define _n << "\n";
#define _s << " ";
#define t_ << "\t" <<

const int INF = 2e9;

int n, r, c;

namespace sub1 {
    const int N = 45;
    vector<vector<int>> a(N, vector<int>(N));
    int ans = INF;
    int cnt;

    void backtrack(int huong, int ngay, vector<vector<int>> &a) {
        ++cnt;
//        cerr t_ cnt _n
        if (cnt >= 160) return;
        vector<vector<int>> ta(N, vector<int>(N));
        bool ck = 1;
        for (int i = 1; i <= r; ++i) {
            for (int j = 1; j <= c; ++j) {
                if (a[i][j] == 0) {
                    ck = 0;
                    break;
                }
            }
            if (!ck) break;
        }

        if (ck) {
            ans = min(ans, ngay);
            return;
        }
        if (huong == 1) {
            for (int i = 1; i <= r; ++i) {
                for (int j = 1; j <= c; ++j) {
                    if (a[i][j] == 1) {
                        ta[i][j] = 1;
                        if (j > 1) ta[i][j - 1] = 1;
                    }
                }
            }
        }
        else if (huong == 2) {
            for (int i = 1; i <= r; ++i) {
                for (int j = 1; j <= c; ++j) {
                    if (a[i][j] == 1) {
                        ta[i][j] = 1;
                        if (j < c) ta[i][j + 1] = 1;
                    }
                }
            }
        }
        else if (huong == 3) {
            for (int i = 1; i <= r; ++i) {
                for (int j = 1; j <= c; ++j) {
                    if (a[i][j] == 1) {
                        ta[i][j] = 1;
                        if (i > 1) ta[i - 1][j] = 1;
                    }
                }
            }
        }
        else if (huong == 4) {
            for (int i = 1; i <= r; ++i) {
                for (int j = 1; j <= c; ++j) {
                    if (a[i][j] == 1) {
                        ta[i][j] = 1;
                        if (i < c) ta[i + 1][j] = 1;
                    }
                }
            }
        }
        if (ta == a) return;
        if (ngay > 160) return;
//        for (int i = 1; i <= r; ++i) {
//            for (int j = 1; j <= c; ++j) {
//                cerr t_ ta[i][j] _s
//            }
//            cerr _n
//        }
        backtrack(1, ngay + 1, ta);
        backtrack(2, ngay + 1, ta);
        backtrack(3, ngay + 1, ta);
        backtrack(4, ngay + 1, ta);
        ta.clear();
    }

    void sol() {
        cin >> n;
        for (int i = 1; i <= n; ++i) {
            int u, v;
            cin >> u >> v;
            a[u][v] = 1;
        }

        backtrack(1, 0, a);
        cnt = 0;
        backtrack(2, 0, a);
        cnt = 0;
        backtrack(3, 0, a);
        cnt = 0;
        backtrack(4, 0, a);

        cout << ans _n
    }
}

signed main() {
    fio
    if (fopen(name".inp", "r")) {
        opf
    }

    cin >> r >> c;
    if (n == 1) cout << (r + c - 2) _n
    else if (r <= 40 && c <= 40) sub1::sol();
    else cout << min(r - 1, min(c - 1, n)) _n
}

Compilation message (stderr)

cultivation.cpp: In function 'int main()':
cultivation.cpp:6:20: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    6 | #define opf freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout);
      |             ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
cultivation.cpp:126:9: note: in expansion of macro 'opf'
  126 |         opf
      |         ^~~
cultivation.cpp:6:53: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    6 | #define opf freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout);
      |                                              ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
cultivation.cpp:126:9: note: in expansion of macro 'opf'
  126 |         opf
      |         ^~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 30
• Subtask 5: 0 / 20
• Subtask 6: 0 / 20