HDU 2144 (最长连续公共子列 + 并查集) Evolution

我发现我一直理解错题意了，这里的子序列指的是连续子序列，怪不得我写的LCS一直WA

顺便复习一下并查集

 1 //#define LOCAL
 2 #include <iostream>
 3 #include <cstdio>
 4 #include <cstring>
 5 #include <algorithm>
 6 using namespace std;
 7
 8 const int maxn = 111;
 9 int dp[maxn][maxn], parent[maxn], len[maxn];
10 char DNA[maxn][maxn];
11
12 int LCS(int a, int b)
13 {
14     int ans = 0;
15     memset(dp,0,sizeof(dp));
16     for(int i = 1; i <= len[a]; ++i)
17         for(int j = 1; j <= len[b]; ++j)
18         {
19             if(DNA[a][i-1] == DNA[b][j-1])
20                 dp[i][j] = dp[i-1][j-1] + 1;
21             if(dp[i][j] > ans)
22                 ans = dp[i][j];
23         }
24     return ans;
25 }
26
27 int GetParent(int a)
28 {
29     return parent[a] == a ? a : parent[a] = GetParent(parent[a]);
30 }
31
32 int main(void)
33 {
34     #ifdef LOCAL
35         freopen("2144in.txt", "r", stdin);
36     #endif
37
38     int n, kase = 0;
39     double p;
40     while(scanf("%d %lf", &n, &p) == 2)
41     {
42         for(int i = 0; i < n; ++i)
43         {
44             scanf("%s", DNA[i]);
45             parent[i] = i;
46             len[i] = strlen(DNA[i]);
47         }
48         for(int i = 0; i < n; ++i)
49             for(int j = 0; j < i; ++j)
50             {
51                 int pi = GetParent(i);
52                 int pj = GetParent(j);
53                 if(pi == pj)    continue;
54                 double x = LCS(i, j) * 100.0;
55                 if(x/len[i]>p && x/len[j]>p)
56                     parent[pi] = pj;
57             }
58         int ans = 0;
59         for(int i = 0; i < n; ++i)
60             if(parent[i] == i)
61                 ++ans;
62         printf("Case %d:\n%d\n", ++kase, ans);
63     }
64     return 0;
65 }

代码君