QOJ.ac
QOJ
ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#638938 | #7177. Many Many Cycles | lichenyu_ac | WA | 0ms | 3972kb | C++14 | 1.8kb | 2024-10-13 17:22:33 | 2024-10-13 17:22:33 |
Judging History
answer
#include<bits/stdc++.h>
typedef long long ll;
using namespace std;
const int N=5e3+10,M=N*2;
int head[N],ver[M],nxt[M],tot=1;
ll edge[M];
void add(int x,int y,ll z){
ver[++tot]=y,edge[tot]=z,nxt[tot]=head[x],head[x]=tot;
}
tuple<int,int,ll>e[N],sta[N];
int fa[N],top;
int find(int x){
return fa[x]==x?x:fa[x]=find(fa[x]);
}
int n,m;
ll dis[N],dep[N],f[N][25],ans[N];
bool v[N];
void dfs(int x,int fa){
v[x]=1;
f[x][0]=fa;
for(int i=1;i<20;i++)
f[x][i]=f[f[x][i-1]][i-1];
for(int i=head[x];i;i=nxt[i]){
int y=ver[i];
if(y==fa)continue;
dep[y]=dep[x]+1,dis[y]=dis[x]+edge[i];
dfs(y,x);
}
}
int LCA(int x,int y){
if(dep[x]<dep[y])swap(x,y);
for(int i=19;~i;i--)
if(dep[f[x][i]]>=dep[y])
x=f[x][i];
if(x==y)return x;
for(int i=19;~i;i--)
if(f[x][i]!=f[y][i])
x=f[x][i],y=f[y][i];
return f[x][0];
}
ll dist(int x,int y){
return dis[x]+dis[y]-2*dis[LCA(x,y)];
}
ll gcd(ll a,ll b){
return b?gcd(b,a%b):a;
}
int main(){
scanf("%d%d",&n,&m);
for(int i=1;i<=m;i++){
int x,y,z;
scanf("%d%d%d",&x,&y,&z);
e[i]=make_tuple(x,y,z);
}
for(int i=1;i<=n;i++)fa[i]=i;
for(int i=1;i<=m;i++){
auto [x,y,z]=e[i];
if(find(x)==find(y)){
sta[++top]=e[i];
}else{
fa[find(y)]=find(x);
add(x,y,z),add(y,x,z);
// printf("%d %d %lld\n",x,y,z);
}
}
for(int i=1;i<=n;i++)
if(!v[i])dep[i]=1,dfs(i,0);
for(int i=1;i<=top;i++){
auto [x,y,z]=sta[i];
ans[i]=z+dist(x,y);
}
ll tmp=ans[1];
for(int i=2;i<=top;i++)
tmp=gcd(tmp,ans[i]);
printf("%lld\n",tmp);
return 0;
}
详细
Test #1:
score: 100
Accepted
time: 0ms
memory: 3948kb
input:
4 4 1 2 1 2 3 1 3 4 1 4 1 1
output:
4
result:
ok answer is '4'
Test #2:
score: 0
Accepted
time: 0ms
memory: 3924kb
input:
4 5 1 2 1 1 3 2 1 4 1 2 3 1 3 4 1
output:
4
result:
ok answer is '4'
Test #3:
score: 0
Accepted
time: 0ms
memory: 3812kb
input:
20 50 1 2 8 1 3 1 3 4 5 3 5 9 3 6 5 6 7 6 7 8 8 2 9 2 8 10 3 8 11 7 8 12 5 3 13 4 7 14 3 6 15 7 9 16 6 8 17 7 16 18 9 16 19 3 18 20 10 11 3 2 17 1 1 16 2 2 15 1 1 10 3 2 9 1 2 19 2 1 6 1 2 7 3 1 17 3 2 15 3 2 8 6 2 5 1 2 8 1 2 12 1 1 12 7 1 4 1 2 18 2 1 11 7 1 14 1 1 18 1 1 18 9 1 10 6 1 14 3 2 20 2...
output:
2
result:
ok answer is '2'
Test #4:
score: 0
Accepted
time: 0ms
memory: 3948kb
input:
20 50 1 2 18468 1 3 26501 3 4 15725 3 5 29359 3 6 24465 6 7 28146 7 8 16828 2 9 492 8 10 11943 8 11 5437 8 12 14605 3 13 154 7 14 12383 6 15 18717 9 16 19896 8 17 21727 16 18 11539 16 19 19913 18 20 26300 11 3 2 17 1 1 16 2 2 15 1 1 10 3 2 9 1 2 19 2 1 6 1 2 7 3 1 17 3 2 15 3 2 8 6 2 5 1 2 8 1 2 12 ...
output:
1
result:
ok answer is '1'
Test #5:
score: 0
Accepted
time: 0ms
memory: 3904kb
input:
100 150 1 2 184676335 1 3 191705725 1 4 293606963 1 5 57078146 2 6 168279962 6 7 29961943 5 8 54392392 5 9 39020154 5 10 123837422 7 11 197199896 3 12 217274772 7 13 18709913 6 14 263007036 11 15 287053812 3 16 303347674 9 17 151417712 17 18 68705548 15 19 326652758 12 20 128598724 2 21 275290779 11...
output:
3
result:
ok answer is '3'
Test #6:
score: 0
Accepted
time: 0ms
memory: 3972kb
input:
100 130 1 2 184676335 1 3 191705725 1 4 293606963 1 5 57078146 2 6 168279962 6 7 29961943 5 8 54392392 5 9 39020154 5 10 123837422 7 11 197199896 3 12 217274772 7 13 18709913 6 14 263007036 11 15 287053812 3 16 303347674 9 17 151417712 17 18 68705548 15 19 326652758 12 20 128598724 2 21 275290779 11...
output:
7
result:
ok answer is '7'
Test #7:
score: 0
Accepted
time: 0ms
memory: 3952kb
input:
100 200 1 2 184676335 1 3 191705725 1 4 293606963 1 5 57078146 2 6 168279962 6 7 29961943 5 8 54392392 5 9 39020154 5 10 123837422 7 11 197199896 3 12 217274772 7 13 18709913 6 14 263007036 11 15 287053812 3 16 303347674 9 17 151417712 17 18 68705548 15 19 326652758 12 20 128598724 2 21 275290779 11...
output:
4
result:
ok answer is '4'
Test #8:
score: -100
Wrong Answer
time: 0ms
memory: 3828kb
input:
100 190 1 2 184676335 1 3 191705725 1 4 293606963 1 5 57078146 2 6 168279962 6 7 29961943 5 8 54392392 5 9 39020154 5 10 123837422 7 11 197199896 3 12 217274772 7 13 18709913 6 14 263007036 11 15 287053812 3 16 303347674 9 17 151417712 17 18 68705548 15 19 326652758 12 20 128598724 2 21 275290779 11...
output:
4
result:
wrong answer expected '2', found '4'