[HDOJ5510]Bazinga（并查集）

题目链接：http://acm.hdu.edu.cn/showproblem.php?pid=5510

普通集合会tle，换高贵的并查集。

 1 #include <algorithm>
 2 #include <iostream>
 3 #include <iomanip>
 4 #include <cstring>
 5 #include <climits>
 6 #include <complex>
 7 #include <fstream>
 8 #include <cassert>
 9 #include <cstdio>
10 #include <bitset>
11 #include <vector>
12 #include <deque>
13 #include <queue>
14 #include <stack>
15 #include <ctime>
16 #include <set>
17 #include <map>
18 #include <cmath>
19
20 using namespace std;
21
22 const int maxn = 510;
23 const int maxm = 2020;
24 int n, ans;
25 int len[maxn];
26 char s[maxn][maxm];
27 set<int> rep[maxn];
28
29 inline bool scan_d(int &num) {
30     char in;bool IsN=false;
31     in=getchar();
32     if(in==EOF) return false;
33     while(in!=‘-‘&&(in<‘0‘||in>‘9‘)) in=getchar();
34     if(in==‘-‘){ IsN=true;num=0;}
35     else num=in-‘0‘;
36     while(in=getchar(),in>=‘0‘&&in<=‘9‘){
37             num*=10,num+=in-‘0‘;
38     }
39     if(IsN) num=-num;
40     return true;
41 }
42
43 int main() {
44     // freopen("in", "r", stdin);
45     int T, _ = 1;
46     scan_d(T);
47     while(T--) {
48         ans = 0;
49         memset(s, 0, sizeof(s));
50         memset(len, 0, sizeof(len));
51         scan_d(n);
52         for(int i = 1; i <= n; i++) {
53             scanf("%s", s[i]);
54             rep[i].clear();
55         }
56         int ans = -1;
57         for(int i = 1; i <= n; i++) {
58             for(int j = i - 1; j >= 1; j--) {
59                 if(len[i] < len[j]) continue;
60                 if(rep[i].find(j) != rep[i].end()) continue;
61                 if(strstr(s[i], s[j]) != NULL) {
62                     rep[i].insert(j);
63                 }
64                 else {
65                     ans = i;
66                     break;
67                 }
68             }
69         }
70         printf("Case #%d: %d\n", _++, ans);
71     }
72     return 0;
73 }

TLE

 1 #include <algorithm>
 2 #include <iostream>
 3 #include <iomanip>
 4 #include <cstring>
 5 #include <climits>
 6 #include <complex>
 7 #include <fstream>
 8 #include <cassert>
 9 #include <cstdio>
10 #include <bitset>
11 #include <vector>
12 #include <deque>
13 #include <queue>
14 #include <stack>
15 #include <ctime>
16 #include <set>
17 #include <map>
18 #include <cmath>
19
20 using namespace std;
21
22 const int maxn = 510;
23 const int maxm = 2020;
24 int n, ans;
25 int pre[maxn];
26 int len[maxn];
27 char s[maxn][maxm];
28
29 int find(int x) {
30     return x == pre[x] ? x : pre[x] = find(pre[x]);
31 }
32 bool check(int x, int y) {
33     x = find(x);
34     y = find(y);
35     if(x == y) return 1;
36     return 0;
37 }
38
39 int main() {
40     // freopen("in", "r", stdin);
41     int T, _ = 1;
42     scanf("%d", &T);
43     while(T--) {
44         ans = 0;
45         memset(s, 0, sizeof(s));
46         memset(len, 0, sizeof(len));
47         scanf("%d", &n);
48         for(int i = 1; i <= n; i++) {
49             scanf("%s", s[i]);
50         }
51         for(int i = 1; i <= n; i++) {
52             pre[i] = i;
53         }
54         int ans = -1;
55         for(int i = 1; i <= n; i++) {
56             for(int j = i - 1; j >= 1; j--) {
57                 if(len[i] < len[j]) continue;
58                 if(check(i, j)) continue;
59                 if(strstr(s[i], s[j]) != NULL) {
60                     pre[i] = j;
61                 }
62                 else {
63                     ans = i;
64                     break;
65                 }
66             }
67         }
68         printf("Case #%d: %d\n", _++, ans);
69     }
70     return 0;
71 }