计蒜客 17412 Card Hand Sorting 最长公共子序列
链接：
https://nanti.jisuanke.com/t/17412
题意：
给你n张扑克，问你最少移动多少次使得排列好
排列好是指同种花色在一起，并且递增或者递减
题解：
生成所有排列好的数列，然后求lcs
代码：
31 int n; 32 int p[MAXN]; 33 int dp[MAXN][MAXN]; 34 VI v[4]; 35 36 int main() { 37 ios::sync_with_stdio(false), cin.tie(0); 38 cin >> n; 39 rep(i, 0, n) { 40 string s; 41 cin >> s; 42 int a, b; 43 if (s[0] == 'T') a = 10; 44 else if (s[0] == 'J') a = 11; 45 else if (s[0] == 'Q') a = 12; 46 else if (s[0] == 'K') a = 13; 47 else if (s[0] == 'A') a = 14; 48 else a = s[0] - '0'; 49 50 if (s[1] == 's') b = 0; 51 else if (s[1] == 'h') b = 1; 52 else if (s[1] == 'd') b = 2; 53 else b = 3; 54 55 int c = a + b * 13; 56 p[i] = c; 57 v[b].pb(c); 58 } 59 rep(i, 0, 4) sort(all(v[i])); 60 int a[4] = { 0,1,2,3 }; 61 int ans = INF; 62 do { 63 rep(i, 0, 1 << 4) { 64 VI vec; 65 rep(j, 0, 4) { 66 VI t = v[a[j]]; 67 if ((i >> j) & 1) reverse(all(t)); 68 rep(i, 0, t.size()) vec.pb(t[i]); 69 } 70 memset(dp, 0, sizeof(dp)); 71 rep(i, 1, n + 1) rep(j, 1, n + 1) { 72 if (p[i - 1] == vec[j - 1]) dp[i][j] = dp[i - 1][j - 1] + 1; 73 else dp[i][j] = max(dp[i - 1][j], dp[i][j - 1]); 74 } 75 ans = min(ans, n - dp[n][n]); 76 } 77 } while (next_permutation(a, a + 4)); 78 cout << ans << endl; 79 return 0; 80 }
