Submission #1065482

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1065482	2024-08-19 08:16:09	boyliguanhan	Longest Trip (IOI23_longesttrip)	C++17	100 / 100	15 ms	852 KiB

longesttrip

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#include "longesttrip.h"
#include<bits/stdc++.h>
using namespace std;
int findit(vector<int>v,vector<int>vf){
    if(v.size()==1)return v[0];
    vector<int>v1,v2;
    for(auto i:v)
        v1.push_back(i),
        swap(v1,v2);
    if(are_connected(v1,vf))
        return findit(v1,vf);
    return findit(v2,vf);
}
mt19937 rng(0);
vector<int> longest_trip(int N, int D){
    vector<int>path1,path2,v(N);
    iota(v.begin(),v.end(),0);
    shuffle(v.begin(),v.end(),rng);
    path1={v[0]},path2={v[1]};
    for(int i=1;i*2+1<N;i++){
        int U=v[i*2],V=v[i*2+1];
        int a=are_connected({U},{path1.back()});
        if(are_connected({U},{V})){
            int b=are_connected({U},{path2.back()});
            if(a) path1.push_back(U),
                path1.push_back(V);
            else if(b)
                path2.push_back(U),
                path2.push_back(V);
            else{ reverse(path2.begin(),path2.end());
 
 
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Compilation message (stderr)

longesttrip.cpp: In function 'std::vector<int> longest_trip(int, int)':
longesttrip.cpp:65:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   65 |         for(int i=0;i<A.size();i++)
      |                     ~^~~~~~~~~
longesttrip.cpp:66:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   66 |             for(int j=0;j<B.size();j++)
      |                         ~^~~~~~~~~

• Subtask 0: 0 / 0
• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 25 / 25
• Subtask 4: 60 / 60