Submission #1210563

#	Time	Username	Problem	Language	Result	Execution time	Memory
1210563		btninh	Selotejp (COCI20_selotejp)	C++20	0 / 110	1 ms	324 KiB

Main

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

#define btninh signed main
#define int long long
#define REP(i, n) for(int i = 0; i < n; ++i)
#define FOR(i, a, b) for(int i = a; i <= b; ++i)
#define FORD(i, a, b) for(int i = a; i >= b; --i)
#define fast ios::sync_with_stdio(0); cin.tie(0)
#define IO(x) if(fopen(x".inp","r")){freopen(x".inp","r",stdin);freopen(x".out","w",stdout);}
#define vi vector<int>
#define vii vector<vector<int>>
#define fi first
#define se second
#define pb push_back
#define pii pair<int,int>
template<class Typ> bool mini(Typ &x, Typ y){if (x > y) return x = y, true; return false;}
template<class Typ> bool maxi(Typ &x, Typ y){if (x < y) return x = y, true; return false;}
const int N = 1005;
const int inf = 1e18;

int n, m, dp[2][1 << 11][2];
char a[N][15];

int getBit(int m, int i){
    return ((m >> i) & 1);
}

btninh(){
    fast;
    IO("main");

    cin >> n >> m;
    FOR(i, 1, n) FOR(j, 1, m) cin >> a[i][j];

    memset(dp, 0x3f3f3f, sizeof dp);
    dp[0][0][0] = 0;
    int cur = 1, lst = 0;

    FOR(i, 1, n){
        FOR(j, 1, m){
            FOR(msk, 0, (1 << m) - 1){
                FOR(l, 0, 1){
                    if (a[i][j] == '.'){
                        // Không cần dán nếu là cửa sổ mở
                        mini(dp[cur][msk & ~(1LL << (j - 1))][0], dp[lst][msk][l]);
                    } else {
                        bool fromLeft = l; // có đang dán ngang từ bên trái không
                        bool fromTop = getBit(msk, j - 1); // có đang dán dọc từ trên xuống không

                        if (fromLeft || fromTop){
                            // Kế thừa dán cũ
                            mini(dp[cur][msk | (1LL << (j - 1))][fromLeft], dp[lst][msk][l]); // dán dọc
                            mini(dp[cur][msk][fromLeft & (j != m)], dp[lst][msk][l]); // dán ngang

                            // Bắt đầu mới
                            mini(dp[cur][msk | (1LL << (j - 1))][l], dp[lst][msk][l] + 1); // dán mới dọc
                            mini(dp[cur][msk][j != m], dp[lst][msk][l] + 1); // dán mới ngang
                        }
                        else {
                            // Chưa được dán, bắt buộc dán mới
                            mini(dp[cur][msk | (1LL << (j - 1))][l], dp[lst][msk][l] + 1); // dọc
                            mini(dp[cur][msk][j != m], dp[lst][msk][l] + 1); // ngang
                        }
                    }
                }
            }

            // Reset dp[lst]
            FOR(msk, 0, (1 << m) - 1){
                dp[lst][msk][0] = dp[lst][msk][1] = inf;
            }
            swap(cur, lst);
        }
    }

    int ans = 0x3f3f3f;
    FOR(msk, 0, (1 << m) - 1){
        ans = min(ans, min(dp[lst][msk][0], dp[lst][msk][1]));
    }
    cout << ans;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:10:45: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 | #define IO(x) if(fopen(x".inp","r")){freopen(x".inp","r",stdin);freopen(x".out","w",stdout);}
      |                                      ~~~~~~~^~~~~~~~~~~~~~~~~~~
Main.cpp:31:5: note: in expansion of macro 'IO'
   31 |     IO("main");
      |     ^~
Main.cpp:10:72: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 | #define IO(x) if(fopen(x".inp","r")){freopen(x".inp","r",stdin);freopen(x".out","w",stdout);}
      |                                                                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~
Main.cpp:31:5: note: in expansion of macro 'IO'
   31 |     IO("main");
      |     ^~

• Subtask 1: 0 / 35
• Subtask 2: 0 / 35
• Subtask 3: 0 / 40