#include <bits/stdc++.h>
using namespace std;
#define int long long
const int MAXN = 1e5;
set<array<int, 2>> h[MAXN];
int c[MAXN], ans[MAXN+1], cnt = 0, suf[MAXN];
bitset<MAXN> vis;
signed main(){
cin.tie(0)->sync_with_stdio(0);
int n, m, x, y; cin >> n >> m;
for(int i=0; i<n; ++i) cin >> c[i];
for(int i=0; i<m; ++i){
cin >> x >> y; --x, --y;
h[x].insert({y, i});
h[y].insert({x, i});
}
if(m > n){
cout << 0;
return 0;
}
queue<int> q; set<int> s;
for(int i=0; i<n; ++i) if(h[i].size() < 2) q.push(i), vis[i] = 1;
while(!q.empty()){
int u = q.front(); q.pop();
++cnt;
array<int, 2> e = *h[u].begin();
ans[e[1]] += c[u];
c[e[0]] -= c[u];
h[e[0]].erase({u, e[1]});
if(h[e[0]].size() < 2 && !vis[e[0]]) q.push(e[0]), vis[e[0]] = 1;
}
if(cnt < n){
if(!((n-cnt) & 1)){
cout << 0;
return 0;
}
for(int i=0; i<n; ++i) if(!vis[i]) x = i;
int u = x;
vector<int> a, b;
while(u != x || a.empty()){
auto v = a.empty() || (*h[u].begin())[0] != a.back() ? *h[u].begin() : *h[u].rbegin();
a.push_back(u);
b.push_back(v[1]);
u = v[0];
}
n = a.size();
int pre = 0;
suf[n-1] = c[a[n-1]];
for(int i=n-2; i>=0; --i) suf[i] = c[a[i]] - suf[i+1];
for(int i=0; i<n; ++i){
pre = c[a[i]] - pre;
ans[b[i]] = (pre + (i+1 < n ? suf[i+1] : 0LL))/2LL;
}
}
for(int i=0; i<m; ++i) cout << 2*ans[i] << '\n';
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
4 ms |
4940 KB |
Output is correct |
| 2 |
Correct |
3 ms |
4940 KB |
Output is correct |
| 3 |
Correct |
5 ms |
5068 KB |
Output is correct |
| 4 |
Correct |
144 ms |
21416 KB |
Output is correct |
| 5 |
Correct |
4 ms |
5016 KB |
Output is correct |
| 6 |
Correct |
3 ms |
4940 KB |
Output is correct |
| 7 |
Correct |
3 ms |
4940 KB |
Output is correct |
| 8 |
Correct |
3 ms |
4940 KB |
Output is correct |
| 9 |
Correct |
4 ms |
5068 KB |
Output is correct |
| 10 |
Correct |
4 ms |
5152 KB |
Output is correct |
| 11 |
Correct |
4 ms |
5164 KB |
Output is correct |
| 12 |
Correct |
4 ms |
5068 KB |
Output is correct |
| 13 |
Correct |
106 ms |
18012 KB |
Output is correct |
| 14 |
Correct |
140 ms |
20532 KB |
Output is correct |
| 15 |
Correct |
171 ms |
21548 KB |
Output is correct |
| 16 |
Correct |
115 ms |
18968 KB |
Output is correct |
| 17 |
Correct |
147 ms |
21544 KB |
Output is correct |
| 18 |
Correct |
139 ms |
21504 KB |
Output is correct |
| 19 |
Correct |
121 ms |
21104 KB |
Output is correct |
| 20 |
Correct |
3 ms |
4940 KB |
Output is correct |
| 21 |
Correct |
4 ms |
5152 KB |
Output is correct |
| 22 |
Correct |
144 ms |
21476 KB |
Output is correct |
| 23 |
Correct |
122 ms |
18008 KB |
Output is correct |
| 24 |
Correct |
146 ms |
21500 KB |
Output is correct |
| 25 |
Correct |
115 ms |
18764 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
4940 KB |
Output is correct |
| 2 |
Correct |
4 ms |
5164 KB |
Output is correct |
| 3 |
Correct |
108 ms |
20016 KB |
Output is correct |
| 4 |
Correct |
91 ms |
19928 KB |
Output is correct |
| 5 |
Correct |
82 ms |
19460 KB |
Output is correct |
| 6 |
Correct |
568 ms |
74564 KB |
Output is correct |
| 7 |
Correct |
3 ms |
5012 KB |
Output is correct |
| 8 |
Correct |
3 ms |
5012 KB |
Output is correct |
| 9 |
Correct |
3 ms |
5036 KB |
Output is correct |
| 10 |
Correct |
3 ms |
4940 KB |
Output is correct |
| 11 |
Correct |
3 ms |
4940 KB |
Output is correct |
| 12 |
Correct |
4 ms |
4940 KB |
Output is correct |
| 13 |
Correct |
3 ms |
4940 KB |
Output is correct |
| 14 |
Correct |
3 ms |
4940 KB |
Output is correct |
| 15 |
Correct |
4 ms |
5196 KB |
Output is correct |
| 16 |
Correct |
4 ms |
5196 KB |
Output is correct |
| 17 |
Correct |
4 ms |
5068 KB |
Output is correct |
| 18 |
Correct |
5 ms |
5068 KB |
Output is correct |
| 19 |
Correct |
4 ms |
5068 KB |
Output is correct |
| 20 |
Correct |
4 ms |
5068 KB |
Output is correct |
| 21 |
Correct |
5 ms |
5324 KB |
Output is correct |
| 22 |
Correct |
4 ms |
5196 KB |
Output is correct |
| 23 |
Correct |
101 ms |
19152 KB |
Output is correct |
| 24 |
Correct |
138 ms |
22200 KB |
Output is correct |
| 25 |
Correct |
100 ms |
19892 KB |
Output is correct |
| 26 |
Correct |
82 ms |
19928 KB |
Output is correct |
| 27 |
Correct |
78 ms |
19752 KB |
Output is correct |
| 28 |
Correct |
95 ms |
20556 KB |
Output is correct |
| 29 |
Correct |
470 ms |
60984 KB |
Output is correct |
| 30 |
Correct |
131 ms |
21744 KB |
Output is correct |
| 31 |
Correct |
118 ms |
22904 KB |
Output is correct |
| 32 |
Correct |
138 ms |
21496 KB |
Output is correct |
| 33 |
Correct |
101 ms |
20764 KB |
Output is correct |
| 34 |
Correct |
80 ms |
19916 KB |
Output is correct |
| 35 |
Correct |
82 ms |
19840 KB |
Output is correct |
| 36 |
Correct |
84 ms |
19972 KB |
Output is correct |
| 37 |
Correct |
618 ms |
74636 KB |
Output is correct |
| 38 |
Correct |
122 ms |
21944 KB |
Output is correct |
| 39 |
Correct |
144 ms |
21456 KB |
Output is correct |
| 40 |
Correct |
131 ms |
22096 KB |
Output is correct |
| 41 |
Correct |
89 ms |
20620 KB |
Output is correct |
| 42 |
Correct |
80 ms |
19820 KB |
Output is correct |
| 43 |
Correct |
85 ms |
19908 KB |
Output is correct |
| 44 |
Correct |
77 ms |
19396 KB |
Output is correct |
| 45 |
Correct |
598 ms |
66208 KB |
Output is correct |
| 46 |
Correct |
120 ms |
21796 KB |
Output is correct |
| 47 |
Correct |
131 ms |
22140 KB |
Output is correct |
| 48 |
Correct |
119 ms |
22800 KB |
Output is correct |
| 49 |
Correct |
116 ms |
19996 KB |
Output is correct |
| 50 |
Correct |
81 ms |
19780 KB |
Output is correct |
| 51 |
Correct |
82 ms |
19872 KB |
Output is correct |
| 52 |
Correct |
83 ms |
19524 KB |
Output is correct |
| 53 |
Correct |
518 ms |
67524 KB |
Output is correct |
| 54 |
Correct |
121 ms |
21492 KB |
Output is correct |
