NaCly_Fish @ 2019-01-07 19:04:18
rt
好像少算了一些,该输出是的地方很多输出否
而且莫名T了,不知道是不是重心找错了
#include<cstdio>
#include<cmath>
#include<iostream>
#include<cstring>
#include<algorithm>
#include<vector>
#include<queue>
#include<bitset>
#define N 10002
#define inf 0x3f3f3f3f
using namespace std;
struct edge{
int v,w;
edge(int v=0,int w=0):v(v),w(w){}
};
vector<edge> adj[N];
int ext[10000002]; //ext[i]表示长为i的路径数
int dis[N],size[N],son[N],node[N];//size是子树大小
bool vis[N];
int n,m,r,sum,cnt;
inline void read(int &x);
void get_root(int u,int fa);
void partition(int u);
void get_dist(int u,int fa,int len);
void solve(int u,int len,int w);
int main(){
int u,v,w,k;
read(n),read(m);
for(int i=1;i<n;++i){
read(u),read(v),read(w);
adj[u].push_back(edge(v,w));
adj[v].push_back(edge(u,w));
}
sum = son[r] = n;
get_root(1,0);
partition(r);
for(int i=1;i<=m;++i){
read(k);
printf(ext[k]>0?"AYE\n":"NAY\n");
}
return 0;
}
void solve(int u,int len,int w){
cnt = 0;
dis[u] = len;
get_dist(u,0,len);
for(int i=1;i<=cnt;++i){
for(int j=1;j<=cnt;++j){
if(i==j) continue;
ext[node[i]+node[j]] += w;
}
}
}
void get_dist(int u,int fa,int len){
int v,l = adj[u].size();
node[++cnt] = dis[u];
for(int i=0;i<l;++i){
v = adj[u][i].v;
if(v==fa||vis[v]) continue;
dis[v] = dis[u]+adj[u][i].w;
get_dist(v,u,dis[v]);
}
}
void partition(int u){
solve(u,0,1);
vis[u] = true;
int v,l = adj[u].size();
for(int i=0;i<l;++i){
v = adj[u][i].v;
if(vis[v]) continue;
solve(u,adj[u][i].w,-1);
sum = size[u];
r = 0;
son[r] = n;
get_root(v,u);
partition(r);
}
}
void get_root(int u,int fa){
size[u] = 1,son[u] = 0;
int v,l = adj[u].size();
for(int i=0;i<l;++i){
v = adj[u][i].v;
if(v==fa||vis[v]) continue;
get_root(v,u);
size[u] += size[v];
son[u] = max(son[u],size[v]);
}
son[u] = max(son[u],sum-size[u]);
if(son[u]<son[r]) r = u;
}
inline void read(int &x){
x = 0;
char c = getchar();
while(c<'0'||c>'9') c = getchar();
while(c>='0'&&c<='9'){
x = (x<<3)+(x<<1)+(c^48);
c = getchar();
}
}
by NaCly_Fish @ 2019-01-07 19:18:29
on test 2:
input:
12 3
1 2 16
1 3 17
3 4 19
4 5 8
5 6 7
1 7 19
1 8 2
7 9 18
5 10 0
7 11 11
5 12 7
16
13
29
output:
NAY
NAY
AYE
answer:
AYE
NAY
AYE
by NaCly_Fish @ 2019-01-07 19:27:06
A掉了。。只是因为solve的地方把v错写成u了。。然后又T又WA
by L_M_ @ 2019-02-18 14:51:01
%%%%dalao