Submission #934020

#	Time	Username	Problem	Language	Result	Execution time	Memory
934020		PieArmy	Commuter Pass (JOI18_commuter_pass)	C++17	100 / 100	378 ms	31172 KiB

commuter_pass

typedef long long ll;
ll pie(ll army){return (1ll<<army);}
#include <bits/stdc++.h>
#define fr first
#define sc second
#define pb push_back
#define endl '\n';
#define mid ((left+right)>>1)
const ll inf=2000000000000000005;
const int sonsuz=2000000005;
using namespace std;
ll fpow(ll x,ll y,ll m=0){if(y<0){cout<<"powError";return -1;}if(m)x%=m;ll res=1;while(y>0){if(y&1)res*=x;x*=x;if(m){x%=m;res%=m;}y>>=1;}return res;}

void code(){
    int n,m,s,t,u,v;cin>>n>>m>>s>>t>>u>>v;
    vector<int>komsu[n+1];
    vector<ll>cos[n+1];
    for(int i=0;i<m;i++){
        int x,y,c;cin>>x>>y>>c;
        komsu[x].pb(y);
        komsu[y].pb(x);
        cos[x].pb(c);
        cos[y].pb(c);
    }
    ll a[n+1],b[n+1];
    for(ll &x:a)
        x=inf;
    for(ll &x:b)
        x=inf;
    priority_queue<pair<ll,int>>q;
    q.push({0,u});
    while(q.size()){
        ll dis=q.top().fr;
        int pos=q.top().sc;
        q.pop();
        if(a[pos]!=inf)
            continue;
        a[pos]=-dis;
        for(int i=0;i<komsu[pos].size();i++){
            if(a[komsu[pos][i]]!=inf)continue;
            q.push({dis-cos[pos][i],komsu[pos][i]});
        }
    }
    q.push({0,v});
    while(q.size()){
        ll dis=q.top().fr;
        int pos=q.top().sc;
        q.pop();
        if(b[pos]!=inf)
            continue;
        b[pos]=-dis;
        for(int i=0;i<komsu[pos].size();i++){
            if(b[komsu[pos][i]]!=inf)continue;
            q.push({dis-cos[pos][i],komsu[pos][i]});
        }
    }
    priority_queue<vector<ll>>pq;
    pq.push({0,-a[s]-b[s],a[s],b[s],s});
    ll ans=a[v];
    bool vis[n+1];for(bool &x:vis)x=false;
    while(pq.size()){
        int pos=pq.top()[4];
        ll dis=pq.top()[0],dis1=pq.top()[2],dis2=pq.top()[3];
        if(pos==t){
            ans=min(ans,-pq.top()[1]);
            break;
        }
        pq.pop();
        if(vis[pos])continue;
        vis[pos]=true;
        for(int i=0;i<komsu[pos].size();i++){
            if(vis[komsu[pos][i]])continue;
            ll x=min(dis1,a[komsu[pos][i]]),y=min(dis2,b[komsu[pos][i]]);
            pq.push({dis-cos[pos][i],-x-y,x,y,komsu[pos][i]});
        }
    }
    cout<<ans;
}

int main(){
    ios_base::sync_with_stdio(false);cin.tie(NULL);
    bool usaco=0;if(usaco){freopen(".in","r",stdin);freopen(".out","w",stdout);}
    int t=1;
    if(!t)cin>>t;
    while(t--){code();cout<<endl;}
    return 0;
}

Compilation message (stderr)

commuter_pass.cpp: In function 'void code()':
commuter_pass.cpp:39:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |         for(int i=0;i<komsu[pos].size();i++){
      |                     ~^~~~~~~~~~~~~~~~~~
commuter_pass.cpp:52:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |         for(int i=0;i<komsu[pos].size();i++){
      |                     ~^~~~~~~~~~~~~~~~~~
commuter_pass.cpp:71:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   71 |         for(int i=0;i<komsu[pos].size();i++){
      |                     ~^~~~~~~~~~~~~~~~~~
commuter_pass.cpp: In function 'int main()':
commuter_pass.cpp:82:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   82 |     bool usaco=0;if(usaco){freopen(".in","r",stdin);freopen(".out","w",stdout);}
      |                            ~~~~~~~^~~~~~~~~~~~~~~~~
commuter_pass.cpp:82:60: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   82 |     bool usaco=0;if(usaco){freopen(".in","r",stdin);freopen(".out","w",stdout);}
      |                                                     ~~~~~~~^~~~~~~~~~~~~~~~~~~

• Subtask 1: 16 / 16
• Subtask 2: 15 / 15
• Subtask 3: 24 / 24
• Subtask 4: 45 / 45