LOJ#2129. 「NOI2015」程序自动分析

$n \leq 1000000$个相等或不等关系描述一些变量,问能否成立,多组数据。

走错片场?普及题误入noi

 1 //#include<iostream>
 2 #include<cstring>
 3 #include<cstdio>
 4 //#include<math.h>
 5 //#include<set>
 6 //#include<queue>
 7 //#include<bitset>
 8 //#include<vector>
 9 #include<algorithm>
10 #include<stdlib.h>
11 using namespace std;
12 
13 #define LL long long
14 int qread()
15 {
16     char c; int s=0,f=1; while ((c=getchar())<'0' || c>'9') (c=='-') && (f=-1);
17     do s=s*10+c-'0'; while ((c=getchar())>='0' && c<='9'); return s*f;
18 }
19 
20 //Pay attention to '-' , LL and double of qread!!!!
21 
22 int T,n;
23 #define maxn 2000011
24 int ufs[maxn];
25 int find(int x) {return x==ufs[x]?x:(ufs[x]=find(ufs[x]));}
26 void Union(int x,int y) {x=find(x); y=find(y); if (x!=y) ufs[x]=y;}
27 
28 #define maxh 1000007
29 struct Hash
30 {
31     struct Edge{int v,id,next;}edge[maxh]; int first[maxh],le;
32     void clear() {memset(first,0,sizeof(first)); le=1;}
33     int insert(int x)
34     {
35         int h=x%maxh;
36         for (int i=first[h];i;i=edge[i].next) if (edge[i].v==x) return edge[i].id;
37         Edge &e=edge[le]; e.v=x; e.id=le; e.next=first[h]; first[h]=le++;
38         return le-1;
39     }
40 }h;
41 
42 struct Node{int x,y;}eee[maxn]; int le=0;
43 int main()
44 {
45     T=qread();
46     while (T--)
47     {
48         n=qread();
49         int op,x,y; h.clear(); le=0;
50         for (int i=1;i<=n+n;i++) ufs[i]=i;
51         for (int i=1;i<=n;i++)
52         {
53             x=qread(); y=qread(); op=qread();
54             x=h.insert(x); y=h.insert(y);
55             if (!op) eee[++le]=(Node){x,y};
56             else Union(x,y);
57         }
58         bool flag=1;
59         for (int i=1;i<=le;i++) if (find(eee[i].x)==find(eee[i].y)) flag=0;
60         if (flag) puts("YES"); else puts("NO");
61     }
62     return 0;
63 }
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posted @ 2018-07-09 14:35  Blue233333  阅读(...)  评论(...编辑  收藏