Submission #308571

#	Time	Username	Problem	Language	Result	Execution time	Memory
308571		kylych03	Crocodile's Underground City (IOI11_crocodile)	C++14	100 / 100	914 ms	48632 KiB

crocodile

#include "crocodile.h"
#include <bits/stdc++.h>
//#include "grader.cpp"
using namespace std;
vector <pair <int, int > > g[100002];
int inf =1e9+7;
pair <int, int> a[100001];
int travel_plan(int N, int M, int R[][2], int L[], int K, int P[])
{
    for(int i = 0; i <= N; i++){
        a[i].first=inf;
        a[i].second=inf;
    }

    set <pair <int, int> > st;
    set <pair <int, int> > ::iterator it;

    for(int i  = 0 ; i < M ;i++){
        g[R[i][0]].push_back(make_pair (R[i][1], L[i]) );
        g[R[i][1]].push_back( make_pair (R[i][0], L[i]));
    }
    for(int i = 0; i < K; i++){


        st.insert(make_pair(0,P[i]));
        a[P[i]].first=0;
        a[P[i]].second=0;

    }
    while(!st.empty()){
         it  = st.begin();
        int len = it->first;
        int v = it -> second;
        st.erase(it);

         if( len > a[v].second)
            continue;
        for(int i= 0 ; i< g[v].size() ; i++ ){
            int to = g[v][i].first;
            int dis = g[v][i].second;
            if(a[to].second > len + dis){

                a[to].second = len + dis;
                if(a[to].first > a[to].second)
                    swap(a[to].first, a[to].second);
                if(a[to].second < inf)
                st.insert(make_pair( a[to].second, to));
            }
        }

    }

    return a[0].second;
}
/*

5 4 3
0 1 2
0 2 3
3 2 1
2 4 4
1 3 4
*/

Compilation message (stderr)

crocodile.cpp: In function 'int travel_plan(int, int, int (*)[2], int*, int, int*)':
crocodile.cpp:38:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |         for(int i= 0 ; i< g[v].size() ; i++ ){
      |                        ~^~~~~~~~~~~~~

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