Submission #1210572

#	Time	Username	Problem	Language	Result	Execution time	Memory
1210572		btninh	Selotejp (COCI20_selotejp)	C++20	0 / 110	0 ms	324 KiB

Main

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

#define btninh signed main
#define int long long
#define FOR(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);}
template<class Typ> bool mini(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];
char a[N][15];

btninh(){
    fast;
    IO("main");
    
    cin >> n >> m;
    FOR(i, 1, n) FOR(j, 1, m) cin >> a[i][j];

    memset(dp, 0x3f, sizeof dp);
    dp[0][0] = 0;
    int cur = 1, lst = 0;

    FOR(i, 1, n){
        FOR(j, 1, m){
            FOR(msk, 0, (1 << m) - 1){
                int bit = 1 << (j - 1);
                int val = dp[lst][msk];
                if (a[i][j] == '.'){
                    mini(dp[cur][msk & ~bit], val); // clear đoạn dọc
                } else {
                    // Dán dọc
                    if (msk & bit){
                        mini(dp[cur][msk], val); // tiếp tục dán dọc
                    } else {
                        mini(dp[cur][msk | bit], val + 1); // bắt đầu dán dọc mới
                    }

                    // Dán ngang
                    if (j == 1 || a[i][j - 1] == '.' || !(msk & (1 << (j - 2)))){
                        // bắt đầu dán ngang mới
                        mini(dp[cur][msk], val + 1);
                    } else {
                        // tiếp tục dán ngang
                        mini(dp[cur][msk], val);
                    }
                }
            }
            FOR(msk, 0, (1 << m) - 1) dp[lst][msk] = inf;
            swap(cur, lst);
        }
    }

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

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:8:45: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 | #define IO(x) if(fopen(x".inp","r")){freopen(x".inp","r",stdin);freopen(x".out","w",stdout);}
      |                                      ~~~~~~~^~~~~~~~~~~~~~~~~~~
Main.cpp:19:5: note: in expansion of macro 'IO'
   19 |     IO("main");
      |     ^~
Main.cpp:8:72: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 | #define IO(x) if(fopen(x".inp","r")){freopen(x".inp","r",stdin);freopen(x".out","w",stdout);}
      |                                                                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~
Main.cpp:19:5: note: in expansion of macro 'IO'
   19 |     IO("main");
      |     ^~

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