#include <bits/stdc++.h>
using namespace std;
#define mp make_pair
#define pb push_back
#define fi first
#define se second
int n, m, cnt[100007], u, v, elim = 0, cur = 0;
long long c[100007], ans[500007], sum = 0;
vector < pair <int, int> > edge[100007];
void solve(){
queue <int> q;
memset(cnt, 0, sizeof(cnt));
for(int i = 1; i <= n; i++){
for(int j = 0; j < (int)edge[i].size(); j++){
if(edge[i][j].se == elim) continue;
cnt[i]++;
}
if(cnt[i] == 1) q.push(i);
}
while(!q.empty()){
int u = q.front();
cnt[u]--;
q.pop();
for(int i = 0; i < (int)edge[u].size(); i++){
int v = edge[u][i].fi, id = edge[u][i].se;
//cout << u << " " << v << " " << id << endl;
if(id == elim || cnt[v] <= 0) continue;
ans[id] = c[u] * 2LL;
c[u] -= ans[id] / 2LL, c[v] -= ans[id] / 2LL;
cnt[v]--;
if(cnt[v] == 1) q.push(v);
}
}
for(int i = 1; i <= n; i++){
if(c[i] != 0){
cout << 0;
exit(0);
}
}
for(int i = 1; i <= m; i++) cout << ans[i] << "\n";
exit(0);
}
void dfs(int u, int par){
cur++;
if(cur & 1) sum += c[u];
else sum -= c[u];
for(int i = 0; i < (int)edge[u].size(); i++){
int v = edge[u][i].fi, id = edge[u][i].se;
if(v == par) continue;
if(cur == u){
ans[id] = sum;
c[u] -= sum / 2LL;
c[v] -= sum / 2LL;
elim = id;
return;
}
dfs(v, u);
}
}
int main(){
ios_base::sync_with_stdio(0);
cin >> n >> m;
for(int i = 1; i <= n; i++){
cin >> c[i];
}
for(int i = 1; i <= m; i++){
cin >> u >> v;
edge[u].pb(mp(v, i));
edge[v].pb(mp(u, i));
}
if(m > n) return cout << 0, 0;
if(m == n - 1) solve();
if(n % 2 == 0) return cout << 0, 0;
dfs(1, 1);
solve();
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
4 ms |
3036 KB |
Output is correct |
| 2 |
Correct |
4 ms |
3200 KB |
Output is correct |
| 3 |
Correct |
5 ms |
3264 KB |
Output is correct |
| 4 |
Correct |
80 ms |
9772 KB |
Output is correct |
| 5 |
Correct |
4 ms |
9772 KB |
Output is correct |
| 6 |
Correct |
4 ms |
9772 KB |
Output is correct |
| 7 |
Correct |
4 ms |
9772 KB |
Output is correct |
| 8 |
Correct |
4 ms |
9772 KB |
Output is correct |
| 9 |
Correct |
5 ms |
9772 KB |
Output is correct |
| 10 |
Correct |
5 ms |
9772 KB |
Output is correct |
| 11 |
Correct |
5 ms |
9772 KB |
Output is correct |
| 12 |
Correct |
5 ms |
9772 KB |
Output is correct |
| 13 |
Correct |
100 ms |
9772 KB |
Output is correct |
| 14 |
Correct |
83 ms |
9772 KB |
Output is correct |
| 15 |
Correct |
82 ms |
9964 KB |
Output is correct |
| 16 |
Correct |
74 ms |
9964 KB |
Output is correct |
| 17 |
Correct |
82 ms |
9964 KB |
Output is correct |
| 18 |
Correct |
87 ms |
10340 KB |
Output is correct |
| 19 |
Correct |
89 ms |
10340 KB |
Output is correct |
| 20 |
Correct |
4 ms |
10340 KB |
Output is correct |
| 21 |
Correct |
5 ms |
10340 KB |
Output is correct |
| 22 |
Correct |
127 ms |
10340 KB |
Output is correct |
| 23 |
Correct |
68 ms |
10340 KB |
Output is correct |
| 24 |
Correct |
97 ms |
10456 KB |
Output is correct |
| 25 |
Correct |
71 ms |
10456 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
5 ms |
10456 KB |
Output isn't correct |
| 2 |
Incorrect |
4 ms |
10456 KB |
Output isn't correct |
| 3 |
Correct |
80 ms |
10456 KB |
Output is correct |
| 4 |
Correct |
96 ms |
10456 KB |
Output is correct |
| 5 |
Correct |
84 ms |
10456 KB |
Output is correct |
| 6 |
Correct |
289 ms |
18684 KB |
Output is correct |
| 7 |
Incorrect |
4 ms |
18684 KB |
Output isn't correct |
| 8 |
Incorrect |
4 ms |
18684 KB |
Output isn't correct |
| 9 |
Correct |
4 ms |
18684 KB |
Output is correct |
| 10 |
Correct |
5 ms |
18684 KB |
Output is correct |
| 11 |
Correct |
5 ms |
18684 KB |
Output is correct |
| 12 |
Correct |
4 ms |
18684 KB |
Output is correct |
| 13 |
Correct |
4 ms |
18684 KB |
Output is correct |
| 14 |
Incorrect |
4 ms |
18684 KB |
Output isn't correct |
| 15 |
Incorrect |
4 ms |
18684 KB |
Output isn't correct |
| 16 |
Incorrect |
5 ms |
18684 KB |
Output isn't correct |
| 17 |
Correct |
4 ms |
18684 KB |
Output is correct |
| 18 |
Correct |
4 ms |
18684 KB |
Output is correct |
| 19 |
Correct |
4 ms |
18684 KB |
Output is correct |
| 20 |
Correct |
4 ms |
18684 KB |
Output is correct |
| 21 |
Correct |
5 ms |
18684 KB |
Output is correct |
| 22 |
Incorrect |
5 ms |
18684 KB |
Output isn't correct |
| 23 |
Incorrect |
88 ms |
18684 KB |
Output isn't correct |
| 24 |
Incorrect |
64 ms |
18684 KB |
Output isn't correct |
| 25 |
Correct |
58 ms |
18684 KB |
Output is correct |
| 26 |
Correct |
69 ms |
18684 KB |
Output is correct |
| 27 |
Correct |
62 ms |
18684 KB |
Output is correct |
| 28 |
Correct |
66 ms |
18684 KB |
Output is correct |
| 29 |
Correct |
233 ms |
18684 KB |
Output is correct |
| 30 |
Incorrect |
67 ms |
18684 KB |
Output isn't correct |
| 31 |
Incorrect |
70 ms |
18684 KB |
Output isn't correct |
| 32 |
Incorrect |
141 ms |
18684 KB |
Output isn't correct |
| 33 |
Correct |
63 ms |
18684 KB |
Output is correct |
| 34 |
Correct |
64 ms |
18684 KB |
Output is correct |
| 35 |
Correct |
59 ms |
18684 KB |
Output is correct |
| 36 |
Correct |
79 ms |
18684 KB |
Output is correct |
| 37 |
Correct |
276 ms |
18772 KB |
Output is correct |
| 38 |
Incorrect |
60 ms |
18772 KB |
Output isn't correct |
| 39 |
Incorrect |
77 ms |
18772 KB |
Output isn't correct |
| 40 |
Incorrect |
63 ms |
18772 KB |
Output isn't correct |
| 41 |
Incorrect |
81 ms |
18772 KB |
Output isn't correct |
| 42 |
Correct |
64 ms |
18772 KB |
Output is correct |
| 43 |
Correct |
65 ms |
18772 KB |
Output is correct |
| 44 |
Correct |
59 ms |
18772 KB |
Output is correct |
| 45 |
Correct |
231 ms |
18772 KB |
Output is correct |
| 46 |
Incorrect |
59 ms |
18772 KB |
Output isn't correct |
| 47 |
Incorrect |
62 ms |
18772 KB |
Output isn't correct |
| 48 |
Incorrect |
71 ms |
18772 KB |
Output isn't correct |
| 49 |
Correct |
58 ms |
18772 KB |
Output is correct |
| 50 |
Correct |
64 ms |
18772 KB |
Output is correct |
| 51 |
Correct |
61 ms |
18772 KB |
Output is correct |
| 52 |
Correct |
58 ms |
18772 KB |
Output is correct |
| 53 |
Correct |
227 ms |
18772 KB |
Output is correct |
| 54 |
Incorrect |
60 ms |
18772 KB |
Output isn't correct |
