Submission #840673

#	Time	Username	Problem	Language	Result	Execution time	Memory
840673		de_sousa	Longest Trip (IOI23_longesttrip)	C++17	15 / 100	17 ms	428 KiB

longesttrip

#include "longesttrip.h"
#include <bits/stdc++.h>
using namespace std;

std::vector<int> longest_trip(int N, int D)
{
    vector<int> S1;
    vector<int> S2;
    S1.push_back(0);
    S2.push_back(1);
    for(int i=2;i<N;i++){
	if(are_connected({S1.back()},{i})){
	    S1.push_back(i);
	}
	else if(are_connected({S2.back()},{i})){
	    S2.push_back(i);
	}
	else{
	    while(S2.size()){
		S1.push_back(S2.back());
		S2.pop_back();
	    }
	    S2.push_back(i);
	}
    }
    
    if(S1.size()<S2.size())swap(S1,S2);
    
    if(!are_connected(S1,S2))
	return S1;

    if(!are_connected({S1[0]},{S1.back()})){
	while(S2.size()){
	    S1.push_back(S2.back());
	    S2.pop_back();
	}
	return S1;
    }

    if(S2.size()!=1&&!are_connected({S2[0]},{S2.back()})){
	while(S1.size()){
	    S2.push_back(S1.back());
	    S1.pop_back();
	}
	return S2;
    }


    vector<int> cand1=S1;
    vector<int> cand2=S2;

    while(cand1.size()!=1){
	vector<int> tmp1=cand1;
	vector<int> tmp2;
	int target=tmp1.size()/2;
	while(tmp1.size()!=target){
	    tmp2.push_back(tmp1.back());
	    tmp1.pop_back();
	}
	if(are_connected(tmp1,cand2))cand1=tmp1;
	else cand1=tmp2;	
    }
    swap(cand1,cand2);
    
    while(cand1.size()!=1){
	vector<int> tmp1=cand1;
	vector<int> tmp2;
	int target=tmp1.size()/2;
	while(tmp1.size()!=target){
	    tmp2.push_back(tmp1.back());
	    tmp1.pop_back();
	}
	if(are_connected(tmp1,cand2))cand1=tmp1;
	else cand1=tmp2;	
    }
    swap(cand1,cand2);

    int pos1=0;
    for(int i=0;i<S1.size();i++){
	if(S1[i]==cand1[0])pos1=i;
    }

    int pos2=0;
    for(int i=0;i<S2.size();i++){
	if(S2[i]==cand2[0])pos2=i;
    }

    vector<int> S3;
    S3.push_back(S1[pos1]);
    for(int i=(pos1+1)%S1.size();i!=pos1;i=(i+1)%S1.size())S3.push_back(S1[i]);
    reverse(S3.begin(),S3.end());
    S3.push_back(S2[pos2]);
    for(int i=(pos2+1)%S2.size();i!=pos2;i=(i+1)%S2.size())S3.push_back(S2[i]);
    return S3;
    
    
}

Compilation message (stderr)

longesttrip.cpp: In function 'std::vector<int> longest_trip(int, int)':
longesttrip.cpp:56:19: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   56 |  while(tmp1.size()!=target){
      |        ~~~~~~~~~~~^~~~~~~~
longesttrip.cpp:69:19: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   69 |  while(tmp1.size()!=target){
      |        ~~~~~~~~~~~^~~~~~~~
longesttrip.cpp:79:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   79 |     for(int i=0;i<S1.size();i++){
      |                 ~^~~~~~~~~~
longesttrip.cpp:84:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   84 |     for(int i=0;i<S2.size();i++){
      |                 ~^~~~~~~~~~

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