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>
#define ll long long
#define se second
#define fi first
#define pll pair<ll,ll>
#define maxn 100005
using namespace std;
ll n,m,s,t,u,v,du[maxn],dv[maxn],ans;
vector<pll> g[maxn];
void djk1(ll st,ll d[]){
priority_queue<pll,vector<pll>,greater<pll>> q;
bool vs[maxn];
fill(vs,vs+maxn,false);
q.push({0,st});
while(!q.empty()){
ll node,w;
tie(w,node)=q.top();
q.pop();
if(!vs[node]){
vs[node]=true;
d[node]+=w;
for(pll it:g[node]) q.push({w+it.se,it.fi});
}
}
}
void djk2(ll st, ll ed){
priority_queue<pair<ll,pll>,vector<pair<ll,pll>>,greater<pair<ll,pll>>> q;
bool vs[maxn];
ll ds[maxn],dp[3][maxn];
fill(vs,vs+maxn,false);
fill(dp[0], dp[0] + 100001, LLONG_MAX / 2);
fill(dp[1], dp[1] + 100001, LLONG_MAX / 2);
dp[0][0]=dp[1][0]= LLONG_MAX/2;
q.push({0,{st,0}});
while(!q.empty()){
ll w,node,par;pll p;
tie(w,p)=q.top();
tie(node,par)=p;
q.pop();
if(!vs[node]){
vs[node]=true;
ds[node]+=w;
dp[0][node]=min(du[node],dp[0][par]);
dp[1][node]=min(dv[node],dp[1][par]);
for(pll it:g[node]) q.push({w+it.se,{it.fi,node}});
}
else if(w==ds[node] and min(dp[0][par],du[node])+min(dv[node],dp[1][par])<=dp[1][node]+dp[0][node]){
dp[0][node]=min(dp[0][par],du[node]);
dp[1][node]=min(dv[node],dp[1][par]);
}
}
ans=min(ans,dp[0][ed]+dp[1][ed]);
}
int main()
{
freopen("PathLib.Inp","r",stdin);
freopen("PathLib.Out","w",stdout);
cin>>n>>m>>s>>t>>u>>v;
for(long i=0;i<m;i++){
ll a,b,c;
cin>>a>>b>>c;
g[a].push_back({b,c});
g[b].push_back({a,c});
}
djk1(u,du); djk1(v,dv);
ans=du[v];
djk2(s,t); djk2(t,s);
cout<<ans;
return 0;
}
컴파일 시 표준 에러 (stderr) 메시지
commuter_pass.cpp: In function 'int main()':
commuter_pass.cpp:60:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
60 | freopen("PathLib.Inp","r",stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
commuter_pass.cpp:61:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
61 | freopen("PathLib.Out","w",stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
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