Submission #691963

#TimeUsernameProblemLanguageResultExecution timeMemory
691963NeosSelotejp (COCI20_selotejp)C++14
110 / 110
45 ms40796 KiB
#include <bits/stdc++.h> using namespace std; #define fi first #define se second #define sz(x) (int)x.size() #define M(x) (1ll << (x)) #define getBit(x, i) ((x) >> (i) & 1) #define rep(i, b, e) for (ll i = (b); i <= (e); i++) #define rrep(i, b, e) for (ll i = (b); i >= (e); i--) typedef long long ll; typedef pair<ll, ll> ii; template <class T> bool minimize(T &a, const T &b) { if(a > b) {a = b; return 1;} return 0; } template <class T> bool maximize(T &a, const T &b) { if(a < b) {a = b; return 1;} return 0; } const int N = 1e3 + 7, M = 10; int n, m, a[N][M + 2], f[N][M][1 << M]; int main() { ios::sync_with_stdio(0); cin.tie(0); cin >> n >> m; rep(i, 1, n) { rep(j, 0, m - 1) { char c; cin >> c; if (c == '#') a[i][j] = 1; } } memset(f, 0x3f, sizeof f); int ans = 2e9; rep(j, 0, (1 << m) - 1) f[0][m - 1][j] = 0; rep(i, 1, n) rep(j, 0, m - 1) rep(k, 0, (1 << m) - 1) { if (a[i][j]) { // verticle if (getBit(k, j)) { if (j == 0) { minimize(f[i][j][k], f[i - 1][m - 1][k ^ M(j)] + 1); if (a[i - 1][j]) minimize(f[i][j][k], f[i - 1][m - 1][k]); } else { minimize(f[i][j][k], f[i][j - 1][k ^ M(j)] + 1); if (a[i - 1][j]) minimize(f[i][j][k], f[i][j - 1][k]); } } else { // horizontal if (j == 0) { f[i][j][k] = min(f[i - 1][m - 1][k ^ M(j)], f[i - 1][m - 1][k]) + 1; } else { if (!a[i][j - 1] || getBit(k, j - 1)) { f[i][j][k] = min(f[i][j - 1][k], f[i][j - 1][k ^ M(j)]) + 1; } if (a[i][j - 1] && !getBit(k, j - 1)) f[i][j][k] = min(f[i][j - 1][k ^ M(j)], f[i][j - 1][k]); } } } else { if (j == 0) f[i][j][k] = min(f[i - 1][m - 1][k], f[i - 1][m - 1][k ^ M(j)]); else f[i][j][k] = min(f[i][j - 1][k], f[i][j - 1][k ^ M(j)]); } if (i == n && j == m - 1) minimize(ans, f[i][j][k]); } cout << ans; }
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