#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
#define fastio ios::sync_with_stdio(false), cin.tie(0)
#define pb push_back
#define eb emplace_back
#define f first
#define s second
#define int long long
const int maxn = 5e5 + 5;
int n, m;
vector<pll> adj[maxn];
int ans[maxn], val[maxn], deg[maxn];
void dfs(int pos, int prev){
for(auto [x, id] : adj[pos]){
if(x == prev) continue;
dfs(x, pos);
ans[id] = val[x], val[pos] -= val[x];
}
}
signed main(void){
fastio;
cin>>n>>m;
for(int i = 0; i < n; i++) cin>>val[i];
for(int i = 0; i < m; i++){
int a, b;
cin>>a>>b;
a--, b--;
adj[a].eb(b, i);
adj[b].eb(a, i);
deg[a] ++, deg[b] ++;
}
if(m > n){
cout<<0<<"\n";
return 0;
}
queue<int> q;
for(int i = 0; i < n; i++) if(deg[i] == 1) q.push(i);
while(!q.empty()){
int pos = q.front(); q.pop();
deg[pos] = 0;
for(auto [x, id] : adj[pos]){
if(!deg[x]) continue;
ans[id] = val[pos], val[x] -= val[pos];
deg[x] --;
if(deg[x] == 1) q.push(x);
}
}
if(m == n - 1){
for(int i = 0; i < m; i++) cout<<ans[i] * 2<<"\n";
return 0;
}
int st = 0;
for(int i = 0; i < n; i++){
if(deg[i] == 2){
st = i;
break;
}
}
int len = 0;
vector<int> vis(n);
vector<int> cyc;
while(!vis[st]){
vis[st] = 1;
cyc.pb(st);
for(auto [x, id] : adj[st]){
if(!vis[x] && deg[x] == 2){
st = x;
break;
}
}
}
if(cyc.size() % 2 == 0){
cout<<0<<"\n";
return 0;
}
int ttl = 0;
for(int i = 1; i < cyc.size(); i++){
ttl += val[cyc[i]] * (i % 2 ? 1 : -1);
}
int a = (ttl + val[cyc[0]]) / 2;
for(int i = 0; i < cyc.size(); i++){
for(auto [x, id] : adj[cyc[i]]){
if(x != cyc[(i + 1) % cyc.size()]) continue;
ans[id] = a;
a = val[x] - a;
}
}
for(int i = 0; i < m; i++) cout<<ans[i] * 2<<"\n";
}
Compilation message
pipes.cpp: In function 'int main()':
pipes.cpp:81:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
81 | for(int i = 1; i < cyc.size(); i++){
| ~~^~~~~~~~~~~~
pipes.cpp:85:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
85 | for(int i = 0; i < cyc.size(); i++){
| ~~^~~~~~~~~~~~
pipes.cpp:63:9: warning: unused variable 'len' [-Wunused-variable]
63 | int len = 0;
| ^~~
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
3 ms |
17500 KB |
Output is correct |
2 |
Correct |
4 ms |
17500 KB |
Output is correct |
3 |
Correct |
4 ms |
17588 KB |
Output is correct |
4 |
Correct |
45 ms |
31292 KB |
Output is correct |
5 |
Correct |
3 ms |
17496 KB |
Output is correct |
6 |
Correct |
4 ms |
17500 KB |
Output is correct |
7 |
Correct |
4 ms |
17496 KB |
Output is correct |
8 |
Correct |
4 ms |
17500 KB |
Output is correct |
9 |
Correct |
4 ms |
17620 KB |
Output is correct |
10 |
Correct |
4 ms |
17500 KB |
Output is correct |
11 |
Correct |
5 ms |
17500 KB |
Output is correct |
12 |
Correct |
4 ms |
17500 KB |
Output is correct |
13 |
Correct |
35 ms |
29780 KB |
Output is correct |
14 |
Correct |
50 ms |
31324 KB |
Output is correct |
15 |
Correct |
44 ms |
31316 KB |
Output is correct |
16 |
Correct |
37 ms |
30292 KB |
Output is correct |
17 |
Correct |
45 ms |
31288 KB |
Output is correct |
18 |
Correct |
44 ms |
31312 KB |
Output is correct |
19 |
Correct |
44 ms |
31060 KB |
Output is correct |
20 |
Correct |
4 ms |
17496 KB |
Output is correct |
21 |
Correct |
4 ms |
17500 KB |
Output is correct |
22 |
Correct |
45 ms |
31408 KB |
Output is correct |
23 |
Correct |
35 ms |
29784 KB |
Output is correct |
24 |
Correct |
45 ms |
31312 KB |
Output is correct |
25 |
Correct |
37 ms |
30028 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
4 ms |
17500 KB |
Output is correct |
2 |
Correct |
4 ms |
17592 KB |
Output is correct |
3 |
Correct |
42 ms |
31704 KB |
Output is correct |
4 |
Correct |
33 ms |
26564 KB |
Output is correct |
5 |
Correct |
32 ms |
26192 KB |
Output is correct |
6 |
Correct |
128 ms |
51944 KB |
Output is correct |
7 |
Correct |
4 ms |
17500 KB |
Output is correct |
8 |
Correct |
4 ms |
17500 KB |
Output is correct |
9 |
Correct |
4 ms |
17496 KB |
Output is correct |
10 |
Correct |
4 ms |
15452 KB |
Output is correct |
11 |
Correct |
3 ms |
15448 KB |
Output is correct |
12 |
Correct |
3 ms |
15452 KB |
Output is correct |
13 |
Correct |
3 ms |
15452 KB |
Output is correct |
14 |
Correct |
4 ms |
17500 KB |
Output is correct |
15 |
Correct |
4 ms |
17548 KB |
Output is correct |
16 |
Correct |
4 ms |
17500 KB |
Output is correct |
17 |
Correct |
4 ms |
17600 KB |
Output is correct |
18 |
Correct |
3 ms |
15452 KB |
Output is correct |
19 |
Correct |
3 ms |
15540 KB |
Output is correct |
20 |
Correct |
3 ms |
15452 KB |
Output is correct |
21 |
Correct |
4 ms |
15708 KB |
Output is correct |
22 |
Correct |
4 ms |
17500 KB |
Output is correct |
23 |
Correct |
40 ms |
30932 KB |
Output is correct |
24 |
Correct |
47 ms |
32588 KB |
Output is correct |
25 |
Correct |
39 ms |
31696 KB |
Output is correct |
26 |
Correct |
34 ms |
26704 KB |
Output is correct |
27 |
Correct |
34 ms |
26448 KB |
Output is correct |
28 |
Correct |
43 ms |
26956 KB |
Output is correct |
29 |
Correct |
105 ms |
45388 KB |
Output is correct |
30 |
Correct |
47 ms |
31968 KB |
Output is correct |
31 |
Correct |
50 ms |
32524 KB |
Output is correct |
32 |
Correct |
47 ms |
32204 KB |
Output is correct |
33 |
Correct |
42 ms |
32208 KB |
Output is correct |
34 |
Correct |
37 ms |
26460 KB |
Output is correct |
35 |
Correct |
34 ms |
26512 KB |
Output is correct |
36 |
Correct |
33 ms |
26512 KB |
Output is correct |
37 |
Correct |
126 ms |
52000 KB |
Output is correct |
38 |
Correct |
48 ms |
32456 KB |
Output is correct |
39 |
Correct |
45 ms |
32080 KB |
Output is correct |
40 |
Correct |
47 ms |
32460 KB |
Output is correct |
41 |
Correct |
41 ms |
32456 KB |
Output is correct |
42 |
Correct |
34 ms |
26500 KB |
Output is correct |
43 |
Correct |
35 ms |
26452 KB |
Output is correct |
44 |
Correct |
38 ms |
26580 KB |
Output is correct |
45 |
Correct |
103 ms |
48844 KB |
Output is correct |
46 |
Correct |
47 ms |
32176 KB |
Output is correct |
47 |
Correct |
46 ms |
32460 KB |
Output is correct |
48 |
Correct |
50 ms |
32708 KB |
Output is correct |
49 |
Correct |
37 ms |
31312 KB |
Output is correct |
50 |
Correct |
33 ms |
26448 KB |
Output is correct |
51 |
Correct |
33 ms |
26452 KB |
Output is correct |
52 |
Correct |
33 ms |
26268 KB |
Output is correct |
53 |
Correct |
110 ms |
47996 KB |
Output is correct |
54 |
Correct |
54 ms |
32184 KB |
Output is correct |