Submission #1007257

#	Time	Username	Problem	Language	Result	Execution time	Memory
1007257		edogawa_something	Longest Trip (IOI23_longesttrip)	C++17	70 / 100	34 ms	600 KiB

longesttrip

#include "longesttrip.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<ll> vii;
typedef pair<ll,ll> pii;
#define pb push_back
#define F first 
#define S second 
#define all(v) v.begin(),v.end()
const int M=1010;
const ll inf=1e18;
void cyclic_shift(vector<int> &v){
    vector<int> vv;
    for(int i=1;i<v.size();i++)
    vv.pb(v[i]);
    vv.pb(v.front());
    swap(vv,v);
}
bool cc(int x,int y){
    return are_connected({x},{y});
}
std::vector<int> longest_trip(int N, int D)
{
    vector<int>v1,v2;
    for(int i=0;i<N;i++){
        if(v1.empty()){
        v1.pb(i);
        continue;
        }
        if(are_connected({i},{v1.back()})){
            v1.pb(i);
            continue;
        }
        if(v2.empty()){
            v2.pb(i);
            continue;
        }
        if(are_connected({i},{v2.back()})){
            v2.pb(i);
            continue;
        }
        reverse(all(v2));
        for(auto it:v2)
        v1.pb(it);
        v2.clear();
        v2.pb(i);
    }
    if(v2.empty()||!are_connected(v1,v2)){
        if(v1.size()>v2.size())
        swap(v1,v2);
        return v2;
    }
    while(!are_connected({v1.back()},v2)&&!are_connected({v1.front()},v2))
    cyclic_shift(v1);
    while(!are_connected({v1.front()},{v2.front()})&&!are_connected({v1.back()},{v2.back()})&&!are_connected({v1.front()},{v2.back()})&&!are_connected({v1.back()},{v2.front()}))
    cyclic_shift(v2);
    if(cc(v1.back(),v2.back()))
    reverse(all(v2));
    if(cc(v1.front(),v2.front()))
    reverse(all(v1));
    if(cc(v1.front(),v2.back()))
    swap(v1,v2);
    for(auto it:v2)
    v1.pb(it);
    return v1;
}

Compilation message (stderr)

longesttrip.cpp: In function 'void cyclic_shift(std::vector<int>&)':
longesttrip.cpp:16:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |     for(int i=1;i<v.size();i++)
      |                 ~^~~~~~~~~

• Subtask 0: 0 / 0
• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 25 / 25
• Subtask 4: 30 / 60