Submission #1283497

#	Time	Username	Problem	Language	Result	Execution time	Memory
1283497		baotoan655	Selotejp (COCI20_selotejp)	C++20	110 / 110	21 ms	584 KiB

Main

#include <bits/stdc++.h>
#define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
using namespace std;
const int N = 1010, INF = 1e9;
int n, m;
char a[N][12];
vector<int> dp, dp2;
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);

    file("A") else file("task");
    cin >> n >> m;
	for(int j = 1; j <= m; ++j) a[0][j] = '.';
	for(int i = 1; i <= n; ++i) {
		for(int j = 1; j <= m; ++j) {
			cin >> a[i][j];
		}
	}
	dp.resize(1 << m);
	dp2.resize(1 << m);
	for(int i = 1; i <= n; ++i) {
		int cur = 1;
		a[i][0] = '.';
		for(int j = 1; j <= m; ++j) {
			for(int mask = 0; mask < (1 << m); ++mask) {
				if(a[i][j] == '.') {
					dp[mask] = min(dp2[mask], dp2[mask ^ cur]);
				} else {
					dp[mask] = INF;
					if(mask & cur) {
						if(a[i - 1][j] == '#') {
							dp[mask] = min(dp[mask], dp2[mask]);
						}
					} else if(cur > 1 && (mask & (cur / 2)) == 0){
						if(a[i][j - 1] == '#') {
							dp[mask] = min(dp[mask], min(dp2[mask], dp2[mask ^ cur]));
						}
					}
					dp[mask] = min({dp[mask], dp2[mask] + 1, dp2[mask ^ cur] + 1});
				}
			}
			dp.swap(dp2);
			cur *= 2;
		}
	}
	int ans = INF;
	for(int i = 0; i < (1 << m); ++i) {
		ans = min(ans, dp2[i]);
	}
	cout << ans << '\n';
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:2:58: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    2 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:12:5: note: in expansion of macro 'file'
   12 |     file("A") else file("task");
      |     ^~~~
Main.cpp:2:91: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    2 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                                                    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:12:5: note: in expansion of macro 'file'
   12 |     file("A") else file("task");
      |     ^~~~
Main.cpp:2:58: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    2 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:12:20: note: in expansion of macro 'file'
   12 |     file("A") else file("task");
      |                    ^~~~
Main.cpp:2:91: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    2 | #define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                                                    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:12:20: note: in expansion of macro 'file'
   12 |     file("A") else file("task");
      |                    ^~~~

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