이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#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";
}
컴파일 시 표준 에러 (stderr) 메시지
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;
| ^~~
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