CF #286 div 2 B. Mr. Kitayuta's Colorful Graph(dfs)
2015-01-22 13:45
567 查看
B. Mr. Kitayuta's Colorful Graph
time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output
Mr. Kitayuta has just bought an undirected graph consisting of n vertices and m edges.
The vertices of the graph are numbered from 1 to n. Each edge, namely edge i,
has a color ci,
connecting vertex ai and bi.
Mr. Kitayuta wants you to process the following q queries.
In the i-th query, he gives you two integers — ui and vi.
Find the number of the colors that satisfy the following condition: the edges of that color connect vertex ui and
vertex vi directly
or indirectly.
Input
The first line of the input contains space-separated two integers — n and m (2 ≤ n ≤ 100, 1 ≤ m ≤ 100),
denoting the number of the vertices and the number of the edges, respectively.
The next m lines contain space-separated three integers — ai, bi (1 ≤ ai < bi ≤ n)
and ci (1 ≤ ci ≤ m).
Note that there can be multiple edges between two vertices. However, there are no multiple edges of the same color between two vertices, that is, if i ≠ j, (ai, bi, ci) ≠ (aj, bj, cj).
The next line contains a integer — q (1 ≤ q ≤ 100),
denoting the number of the queries.
Then follows q lines, containing space-separated two integers — ui and vi (1 ≤ ui, vi ≤ n).
It is guaranteed that ui ≠ vi.
Output
For each query, print the answer in a separate line.
Sample test(s)
input
output
input
output
Note
Let's consider the first sample.
The figure above shows the first sample.
Vertex 1 and vertex 2 are connected by color 1 and 2.
Vertex 3 and vertex 4 are connected by color 3.
Vertex 1 and vertex 4 are not connected by any single color.
题意:
求有多少种颜色的路可以从ai,到bi 。
CODE:
time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output
Mr. Kitayuta has just bought an undirected graph consisting of n vertices and m edges.
The vertices of the graph are numbered from 1 to n. Each edge, namely edge i,
has a color ci,
connecting vertex ai and bi.
Mr. Kitayuta wants you to process the following q queries.
In the i-th query, he gives you two integers — ui and vi.
Find the number of the colors that satisfy the following condition: the edges of that color connect vertex ui and
vertex vi directly
or indirectly.
Input
The first line of the input contains space-separated two integers — n and m (2 ≤ n ≤ 100, 1 ≤ m ≤ 100),
denoting the number of the vertices and the number of the edges, respectively.
The next m lines contain space-separated three integers — ai, bi (1 ≤ ai < bi ≤ n)
and ci (1 ≤ ci ≤ m).
Note that there can be multiple edges between two vertices. However, there are no multiple edges of the same color between two vertices, that is, if i ≠ j, (ai, bi, ci) ≠ (aj, bj, cj).
The next line contains a integer — q (1 ≤ q ≤ 100),
denoting the number of the queries.
Then follows q lines, containing space-separated two integers — ui and vi (1 ≤ ui, vi ≤ n).
It is guaranteed that ui ≠ vi.
Output
For each query, print the answer in a separate line.
Sample test(s)
input
4 5 1 2 1 1 2 2 2 3 1 2 3 3 2 4 3 3 1 2 3 4 1 4
output
2 1 0
input
5 7 1 5 1 2 5 1 3 5 1 4 5 1 1 2 2 2 3 2 3 4 2 5 1 5 5 1 2 5 1 5 1 4
output
1 1 1 1 2
Note
Let's consider the first sample.
The figure above shows the first sample.
Vertex 1 and vertex 2 are connected by color 1 and 2.
Vertex 3 and vertex 4 are connected by color 3.
Vertex 1 and vertex 4 are not connected by any single color.
题意:
求有多少种颜色的路可以从ai,到bi 。
CODE:
#include<iostream> #include<cstdio> #include<cstring> #include<cmath> #include<string> #include<algorithm> #include<cstdlib> #include<set> #include<queue> #include<stack> #include<vector> #include<map> #define N 100010 #define Mod 10000007 #define lson l,mid,idx<<1 #define rson mid+1,r,idx<<1|1 #define lc idx<<1 #define rc idx<<1|1 const double EPS = 1e-11; const double PI = acos ( -1.0 ); const double E = 2.718281828; typedef long long ll; const int INF = 1000010; using namespace std; bool G[110][110][110]; bool vis[110][110][110]; int n,m,q; int s,e,ans; int flag; void dfs(int a,int x) { if(a==e) { ans+=1; flag=0; return ; } for(int i=1; i<=n; i++) { if(!flag) break; if(a==i) continue; if(G[a][i][x]&&!vis[a][i][x]&&flag) { vis[a][i][x]=vis[i][a][x]=1; dfs(i,x); } } } int main() { //freopen("in.txt","r",stdin); while(cin>>n>>m) { memset(vis,0,sizeof vis); memset(G,0,sizeof G); int mm=m; while(m--) { int a,b,c; scanf("%d%d%d",&a,&b,&c); G[a][b][c]=G[b][a][c]=1; } cin>>q; while(q--) { scanf("%d%d\n",&s,&e); memset(vis,0,sizeof vis); ans=0; for(int i=1; i<=mm; i++) { flag=1; dfs(s,i); } printf("%d\n",ans); } } return 0; }
相关文章推荐
- 【树链剖分】【dfs序】【LCA】【分类讨论】Codeforces Round #425 (Div. 2) D. Misha, Grisha and Underground
- Codeforces Round #200 (Div. 1) D Water Tree 树链剖分 or dfs序
- Codeforces Round #381 (Div. 2) D. Alyona and a tree dfs+二分+线段树延迟操作、树形化线性
- Codeforces Round #428 (Div. 2) C. Journey(dfs deep
- C. Journey(dfs求期望+Codeforces Round #428 (Div. 2))
- 【DFS——Codeforces Beta Round #14 (Div. 2)】D. Two Paths
- 【dfs找环】Codeforces Beta Round #80 (Div. 1 Only)——B. Cthulhu
- Codeforces Round #331 (Div. 2) .D - Wilbur and Trees, 枚举情况的DFS
- Codeforces Round #384 (Div. 2)D(树形dp,dfs)
- Codeforces Round #430 (Div. 2) C. Ilya And The Tree dfs+set
- Codeforces Round #461 (Div. 2) B. Magic Forest(DFS)
- Codeforces Round #256 (Div. 2)E(DFS暴搜)
- hdu 5423 Rikka with Tree(dfs)bestcoder #53 div2 1002
- 【 Codeforces Round #268 (Div. 1)】B.Two Set【dfs找增广路】
- Codeforces Round #321 (Div. 2) 580C Kefa and Park(dfs)
- Codeforces Round #403 (Div. 2)C Andryusha and Colored Balloons (dfs)
- Codeforces #245 (Div. 2)C. Xor-tree(DFS&&贪心
- DFS Codeforces Round #299 (Div. 2) B. Tavas and SaDDas
- Codeforces Round #308 (Div. 2) C. Vanya and Scales dfs
- Educational Codeforces Round 34 div2 Hungry Student Problem 简单dfs