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;
long long U[100005], V[100005], W[100005], par[100005][20], depth[100005], sum[100005];
vector<pair<long long, long long> > adj[100005];
void dfs(long long u, long long p)
{
par[u][0]=p;
for (long long i=1; i<20; i++)
par[u][i]=par[par[u][i-1]][i-1];
for (long long i=0; i<adj[u].size(); i++)
{
long long v=adj[u][i].first, w=adj[u][i].second;
if (v==p)
continue;
depth[v]=depth[u]+1;
sum[v]=sum[u]+w;
dfs(v, u);
}
}
int main()
{
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
long long n, m, q, val;
cin >> n >> m >> q;
for (long long i=1; i<n; i++)
cin >> U[i] >> V[i];
for (long long i=1; i<=m; i++)
{
long long x, y;
cin >> x >> y;
W[x]++;
val=y;
}
for (long long i=1; i<n; i++)
{
adj[U[i]].push_back({V[i], W[i]});
adj[V[i]].push_back({U[i], W[i]});
}
dfs(1, 1);
for (long long i=1; i<=q; i++)
{
long long a, b, c, d, curA, curB;
cin >> a >> b >> c >> d;
if (depth[a]<depth[b])
swap(a, b);
curA=a, curB=b;
for (long long j=19; j>=0; j--)
if ((depth[a]-depth[b])&(1<<j))
curA=par[curA][j];
for (long long j=19; j>=0; j--)
{
if (par[curA][j]!=par[curB][j])
{
curA=par[curA][j];
curB=par[curB][j];
}
}
if (curA!=curB)
{
curA=par[curA][0];
curB=par[curB][0];
}
cout << max(-1LL, c-max(0LL, sum[a]+sum[b]-sum[curA]*2-d/val)) << '\n';
}
}
컴파일 시 표준 에러 (stderr) 메시지
currencies.cpp: In function 'void dfs(long long int, long long int)':
currencies.cpp:10:26: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
10 | for (long long i=0; i<adj[u].size(); i++)
| ~^~~~~~~~~~~~~~
currencies.cpp: In function 'int main()':
currencies.cpp:65:65: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized]
65 | cout << max(-1LL, c-max(0LL, sum[a]+sum[b]-sum[curA]*2-d/val)) << '\n';
| ~^~~~
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