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#include "bits/stdc++.h" using namespace std; #define rep(i, n) for (int i = 0; i < (int)(n); ++i) #define rep2(i,l,r)for(int i=(l);i<(r);++i) #define endl "\n" long long N, M, subM; int Board[7][7]; long long dfs(const int &d) { if (d == ((N - 1)* (N - 1) - 1)) { return 1; } int x = d / (N - 1) + 1; int y = d % (N - 1) + 1; long long ret = 0; rep(i, N) { int num = i + 1; bool b = true; rep(j, N) { if (num == Board[x][j]) { b = false; break; } } if (!b) { continue; } rep(j, N) { if (num == Board[j][y]) { b = false; break; } } if (!b) { continue; } Board[x][y] = num; ret += dfs(d + 1); Board[x][y] = 0; } return ret; } int main() { cin >> N; clock_t start = clock(); M = 1; rep(i, N) { M *= (i + 1); } subM = M / N; rep(i, N) { Board[0][i] = i + 1; Board[i][0] = i + 1; } long long ans = M * subM; ans *= dfs(0); cout << ans << endl; clock_t end = clock(); const double time = static_cast<double>(end - start); printf("time %d[ms]\n", (int)time); } |
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2·î17Æü¡Ê¿å¡Ë 22:55:37¡¡¡¡
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#include "bits/stdc++.h" using namespace std; #define rep(i, n) for (int i = 0; i < (int)(n); ++i) #define rep2(i,l,r)for(int i=(l);i<(r);++i) #define endl "\n" long long N, M, subM; int memo[5040][7]; bool Check[7][7]; long long dfs(const int &d) { if (d == (N - 2)) { return 1; } long long ret = 0; rep2(i, (d + 1)*subM, (d + 2)*subM) { bool b = true; rep2(j, 1, N) { if (Check[j][memo[i][j]]) { b = false; break; } } if (b) { rep(j, N) { Check[j][memo[i][j]] = true; } ret += dfs(d + 1); rep(j, N) { Check[j][memo[i][j]] = false; } } } return ret; } int main() { cin >> N; clock_t start = clock(); M = 1; vector<int>v; rep(i, N) { v.push_back(i); M *= (i + 1); } subM = M / N; int now = 0; do { rep(i, N) { memo[now][i] = v[i]; } now++; } while (next_permutation(v.begin(), v.end())); rep(i, N) { Check[i][i] = true; } long long ans = M * subM; ans *= dfs(0); cout << ans << endl; clock_t end = clock(); const double time = static_cast<double>(end - start); printf("time %d[ms]\n", (int)time); } |
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2·î17Æü¡Ê¿å¡Ë 22:56:26¡¡¡¡
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#50163
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2·î17Æü¡Ê¿å¡Ë 23:18:25¡¡¡¡
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