Submission #1102635

#	Time	Username	Problem	Language	Result	Execution time	Memory
1102635		asli_bg	Crocodile's Underground City (IOI11_crocodile)	C++11	0 / 100	2 ms	10576 KiB

crocodile

#pragma GCC optimize("O3,unroll-loops")
#include "crocodile.h"

#include<bits/stdc++.h>
using namespace std;
 
#define fi first
#define se second
#define all(x) x.begin(),x.end()
#define FOR(i,a) for(int i=0;i<(a);i++)
#define FORE(i,a,b) for(int i=(a);i<(b);i++)
 
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<bool> vb;
typedef vector<pii> vii;
 
#define cont(x) for(auto el:x) {cout<<el<<' ';} cout<<endl;
#define endl '\n'
#define contp(x) for(auto el:x) {cout<<el.fi<<'-'<<el.se<<' ';} cout<<endl;
#define pb push_back
 
#define sp <<' '<<
 
#define DEBUG(x) {cout<<(#x) sp x<<endl;}
 
const int MAXN=1e5+5;
const int INF=1e9;
 
int n,m,k;
vii adj[MAXN];
//her node için min 3 yolu tut, nereden geldiğiyle birlikte
//yol[i]={j,k} --> k'dan i'ye shortest path=j
multiset<pii> yol[MAXN];

bool vis[MAXN];
bool cikis[MAXN];
int dist[MAXN];
int p[MAXN];
int cev;

void gez(){
    set<pii> s;
    FORE(i,2,n+1) dist[i]=INF;
    dist[1]=0;
    s.insert({0,1});

    while(!s.empty()){
        auto el=*s.begin();
        s.erase(*s.begin());
        
        int dd=el.fi;
        int nd=el.se;

        //cout<<endl;
        //cout<<"node" sp nd<<endl;
        //cout<<"mesafe" sp dd<<endl;

        vis[nd]=true;

        int mn=yol[nd].begin()->fi;
        int ind=yol[nd].begin()->se;

        

        if(ind==p[nd]){
            auto it=yol[nd].begin();
            it++;
            mn=it->fi;
            ind=it->se;
        }

        //DEBUG(mn);
        //DEBUG(ind);

        for(auto ell:adj[nd]){
            int kom=ell.fi;
            int cost=ell.se;
            if(kom==ind) continue;
            if(kom==p[nd]) continue;
            if(vis[kom]) continue;
            p[kom]=nd;
            dist[kom]=dd+cost;
            s.insert({dist[kom],kom});
        }
    }
}

void dij(int bas){
    yol[bas].clear();
    yol[bas].insert({0,bas});
    yol[bas].insert({0,bas});
    yol[bas].insert({0,bas});

    multiset<pii> s;
    s.insert({0,bas});

    while(!s.empty()){
        auto el=*s.begin();
        s.erase(*s.begin());
        
        int dd=el.fi;
        int nd=el.se;

        for(auto ell:adj[nd]){
            int kom=ell.fi;
            int cost=ell.se;

            yol[kom].insert({dd+cost,nd});
            s.insert({dd+cost,kom});
            if(yol[kom].size()>2){
                pii son=*yol[kom].rbegin();
                yol[kom].erase(yol[kom].find(son));
                if(s.find({son.fi,kom})!=s.end()) s.erase(s.find({son.fi,kom}));
            }
        }
    }
}

int travel_plan(int N, int M, int R[][2], int L[], int K, int P[]){
    n=N;
    m=M;
    k=K;
    FOR(i,m){
        int bir=R[i][0];
        int iki=R[i][1];
        bir++;iki++;
        adj[bir].pb({iki,L[i]});
        adj[iki].pb({bir,L[i]});
    }
 
    FOR(i,k){
        P[i]++;
        cikis[P[i]]=true;
    }

    FORE(i,1,n+1){
        if(!cikis[i]){
            yol[i].insert({INF,INF});
            yol[i].insert({INF,INF});
        }
    }
 
    FORE(i,1,n+1){
        if(cikis[i]){
            dij(i);
        }
    }

    gez();
    cev=INF;
    //cout<<endl;
    FORE(i,1,n+1){
        //cout<<"i" sp i sp dist[i]<<endl;
        if(cikis[i]){
            cev=min(dist[i],cev);
        }
    }
 
    return cev;
}

Compilation message (stderr)

crocodile.cpp: In function 'void gez()':
crocodile.cpp:61:13: warning: variable 'mn' set but not used [-Wunused-but-set-variable]
   61 |         int mn=yol[nd].begin()->fi;
      |             ^~

• Subtask 1: 0 / 46
• Subtask 2: 0 / 43
• Subtask 3: 0 / 11