#include<bits/stdc++.h>
const int N = 1e5 + 5;
using namespace std;
typedef pair <int, int> ii;
vector <ii> adj[N];
int n, m, cnt[N], ans[5*N], a[N];
bool dead[N];
int main(){
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
cin >> n >> m;
for (int i = 1; i <= n; i++) cin >> a[i];
for (int i = 1; i <= m; i++){
int u, v;
cin >> u >> v;
adj[u].push_back(ii(v, i));
adj[v].push_back(ii(u, i));
cnt[u]++; cnt[v]++;
}
queue <int> mq;
for (int i = 1; i <= n; i++) if (cnt[i] <= 1) mq.push(i);
while (mq.size()){
int u = mq.front(); mq.pop();
dead[u] = true;
for (auto p : adj[u]){
int v = p.first, id = p.second;
cnt[v]--;
if (dead[v]) continue;
ans[id] = a[u];
a[v] -= a[u];
a[u] = 0;
if (cnt[v] == 1) mq.push(v);
}
if (a[u]) return cout << 0, 0;
}
for (int i = 1; i <= n; i++) if (cnt[i] >= 3) return cout << 0, 0;
for (int i = 1; i <= n; i++){
if (dead[i]) continue;
vector <ii> mv;
int u = i, cnt = 0, cur = 0;
while (!dead[u]){
dead[u] = true; cnt++;
for (auto p : adj[u]){
int v = p.first, id = p.second;
if (dead[v]) continue;
ans[id] = a[u] - cur; cur = ans[id];
u = v; mv.push_back(ii(u, id));
break;
}
}
if (cnt % 2 == 0 || ans[mv.back().second] % 2 == 1) return cout << 0, 0;
cur = ans[mv.back().second] / 2;
for (int i = 0; i < mv.size(); i++) ans[mv[i].second] -= cur, cur = -cur;
}
for (int i = 1; i <= m; i++) cout << ans[i] * 2 << "\n";
}
Compilation message
pipes.cpp: In function 'int main()':
pipes.cpp:55:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0; i < mv.size(); i++) ans[mv[i].second] -= cur, cur = -cur;
~~^~~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
4 ms |
2684 KB |
Output is correct |
| 2 |
Correct |
4 ms |
2828 KB |
Output is correct |
| 3 |
Correct |
4 ms |
2872 KB |
Output is correct |
| 4 |
Correct |
91 ms |
8532 KB |
Output is correct |
| 5 |
Correct |
4 ms |
8532 KB |
Output is correct |
| 6 |
Correct |
4 ms |
8532 KB |
Output is correct |
| 7 |
Correct |
5 ms |
8532 KB |
Output is correct |
| 8 |
Correct |
4 ms |
8532 KB |
Output is correct |
| 9 |
Correct |
4 ms |
8532 KB |
Output is correct |
| 10 |
Correct |
4 ms |
8532 KB |
Output is correct |
| 11 |
Correct |
5 ms |
8532 KB |
Output is correct |
| 12 |
Correct |
4 ms |
8532 KB |
Output is correct |
| 13 |
Correct |
61 ms |
8532 KB |
Output is correct |
| 14 |
Correct |
77 ms |
8532 KB |
Output is correct |
| 15 |
Correct |
84 ms |
8688 KB |
Output is correct |
| 16 |
Correct |
58 ms |
8688 KB |
Output is correct |
| 17 |
Correct |
87 ms |
8704 KB |
Output is correct |
| 18 |
Correct |
95 ms |
8704 KB |
Output is correct |
| 19 |
Correct |
78 ms |
8704 KB |
Output is correct |
| 20 |
Correct |
4 ms |
8704 KB |
Output is correct |
| 21 |
Correct |
4 ms |
8704 KB |
Output is correct |
| 22 |
Correct |
75 ms |
8704 KB |
Output is correct |
| 23 |
Correct |
57 ms |
8704 KB |
Output is correct |
| 24 |
Correct |
72 ms |
8704 KB |
Output is correct |
| 25 |
Correct |
62 ms |
8704 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
5 ms |
8704 KB |
Output isn't correct |
| 2 |
Incorrect |
4 ms |
8704 KB |
Output isn't correct |
| 3 |
Correct |
63 ms |
8704 KB |
Output is correct |
| 4 |
Correct |
61 ms |
8704 KB |
Output is correct |
| 5 |
Correct |
61 ms |
8704 KB |
Output is correct |
| 6 |
Correct |
235 ms |
17704 KB |
Output is correct |
| 7 |
Incorrect |
4 ms |
17704 KB |
Output isn't correct |
| 8 |
Incorrect |
4 ms |
17704 KB |
Output isn't correct |
| 9 |
Correct |
5 ms |
17704 KB |
Output is correct |
| 10 |
Correct |
4 ms |
17704 KB |
Output is correct |
| 11 |
Correct |
4 ms |
17704 KB |
Output is correct |
| 12 |
Correct |
4 ms |
17704 KB |
Output is correct |
| 13 |
Correct |
4 ms |
17704 KB |
Output is correct |
| 14 |
Incorrect |
4 ms |
17704 KB |
Output isn't correct |
| 15 |
Incorrect |
4 ms |
17704 KB |
Output isn't correct |
| 16 |
Incorrect |
6 ms |
17704 KB |
Output isn't correct |
| 17 |
Correct |
6 ms |
17704 KB |
Output is correct |
| 18 |
Correct |
4 ms |
17704 KB |
Output is correct |
| 19 |
Correct |
4 ms |
17704 KB |
Output is correct |
| 20 |
Correct |
5 ms |
17704 KB |
Output is correct |
| 21 |
Correct |
5 ms |
17704 KB |
Output is correct |
| 22 |
Incorrect |
4 ms |
17704 KB |
Output isn't correct |
| 23 |
Incorrect |
64 ms |
17704 KB |
Output isn't correct |
| 24 |
Incorrect |
71 ms |
17704 KB |
Output isn't correct |
| 25 |
Correct |
60 ms |
17704 KB |
Output is correct |
| 26 |
Correct |
64 ms |
17704 KB |
Output is correct |
| 27 |
Correct |
53 ms |
17704 KB |
Output is correct |
| 28 |
Correct |
67 ms |
17704 KB |
Output is correct |
| 29 |
Correct |
200 ms |
17704 KB |
Output is correct |
| 30 |
Incorrect |
87 ms |
17704 KB |
Output isn't correct |
| 31 |
Incorrect |
79 ms |
17704 KB |
Output isn't correct |
| 32 |
Incorrect |
76 ms |
17704 KB |
Output isn't correct |
| 33 |
Correct |
71 ms |
17704 KB |
Output is correct |
| 34 |
Correct |
75 ms |
17704 KB |
Output is correct |
| 35 |
Correct |
71 ms |
17704 KB |
Output is correct |
| 36 |
Correct |
61 ms |
17704 KB |
Output is correct |
| 37 |
Correct |
247 ms |
17704 KB |
Output is correct |
| 38 |
Incorrect |
86 ms |
17704 KB |
Output isn't correct |
| 39 |
Incorrect |
81 ms |
17704 KB |
Output isn't correct |
| 40 |
Incorrect |
78 ms |
17704 KB |
Output isn't correct |
| 41 |
Correct |
79 ms |
17704 KB |
Output is correct |
| 42 |
Correct |
53 ms |
17704 KB |
Output is correct |
| 43 |
Correct |
63 ms |
17704 KB |
Output is correct |
| 44 |
Correct |
62 ms |
17704 KB |
Output is correct |
| 45 |
Correct |
184 ms |
17704 KB |
Output is correct |
| 46 |
Incorrect |
65 ms |
17704 KB |
Output isn't correct |
| 47 |
Incorrect |
71 ms |
17704 KB |
Output isn't correct |
| 48 |
Incorrect |
74 ms |
17704 KB |
Output isn't correct |
| 49 |
Correct |
56 ms |
17704 KB |
Output is correct |
| 50 |
Correct |
58 ms |
17704 KB |
Output is correct |
| 51 |
Correct |
57 ms |
17704 KB |
Output is correct |
| 52 |
Correct |
54 ms |
17704 KB |
Output is correct |
| 53 |
Correct |
196 ms |
17704 KB |
Output is correct |
| 54 |
Incorrect |
61 ms |
17704 KB |
Output isn't correct |
