Submission #1038349

#	Time	Username	Problem	Language	Result	Execution time	Memory
1038349		Andrey	Longest Trip (IOI23_longesttrip)	C++17	100 / 100	13 ms	600 KiB

longesttrip

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

int n;

int dude(vector<int>& wow, vector<int>& wut, int y) {
    vector<int> a(0);
    vector<int> b(0);
    if(y == -1) {
        for(int i = 0; i < wut.size(); i++) {
            b.push_back(wut[i]);
        }
    }
    else {
        b.push_back(wut[y]);
    }
    int l = 0,r = wow.size()-1;
    while(l < r) {
        int m = (l+r)/2;
        a.clear();
        for(int i = l; i <= m; i++) {
            a.push_back(wow[i]);
        }
        if(are_connected(a,b)) {
            r = m;
        }
        else {
            l = m+1;
        }
    }
    return l;
}
 
std::vector<int> longest_trip(int N, int D)
{
    n = N;
    vector<int> wow(0);
    vector<int> wut(0);
    wow.push_back(0);
    wut.push_back(1);
    for(int i = 2; i < n; i+=2) {
        bool a = are_connected({i},{wow[wow.size()-1]});
        if(a) {
            wow.push_back(i);
            i--;
            continue;
        }
        bool b = are_connected({i},{wut[wut.size()-1]});
        if(i == n-1) {
            if(b) {
                wut.push_back(i);
            }
            else {
                for(int j = wut.size()-1; j >= 0; j--) {
                    wow.push_back(wut[j]);
                }
                wut.clear();
                wut.push_back(i);
            }
        }
        else {
            bool c = are_connected({i},{i+1});
            if(b&c) {
                wut.push_back(i);
                wut.push_back(i+1);
            }
            else if((!b)&c) {
                for(int j = wut.size()-1; j >= 0; j--) {
                    wow.push_back(wut[j]);
                }
                wut.clear();
                wut.push_back(i);
                wut.push_back(i+1);
            }
            else if(b&(!c)) {
                wut.push_back(i);
                wow.push_back(i+1);
            }
            else {
                wow.push_back(i+1);
                for(int j = wut.size()-1; j >= 0; j--) {
                    wow.push_back(wut[j]);
                }
                wut.clear();
                wut.push_back(i);
            }
        }
    }
    vector<int> ans(0);
    if(are_connected({wow[0]},{wut[0]})) {
        for(int i = wow.size()-1; i >= 0; i--) {
            ans.push_back(wow[i]);
        }
        for(int i = 0; i < wut.size(); i++) {
            ans.push_back(wut[i]);
        }
        return ans;
    }
    if(are_connected({wow[wow.size()-1]},{wut[0]})) {
        for(int i = 0; i < wow.size(); i++) {
            ans.push_back(wow[i]);
        }
        for(int i = 0; i < wut.size(); i++) {
            ans.push_back(wut[i]);
        }
        return ans;
    }
    if(are_connected({wow[0]},{wut[wut.size()-1]})) {
        for(int i = wow.size()-1; i >= 0; i--) {
            ans.push_back(wow[i]);
        }
        for(int i = wut.size()-1; i >= 0; i--) {
            ans.push_back(wut[i]);
        }
        return ans;
    }
    vector<int> a(0);
    vector<int> b(0);
    for(int i = 0; i < wow.size(); i++) {
        a.push_back(wow[i]);
    }
    for(int i = 0; i < wut.size(); i++) {
        b.push_back(wut[i]);
    }
    if(!are_connected(a,b)) {
        if(a.size() > b.size()) {
            return a;
        }
        else {
            return b;
        }
    }
    int x1 = dude(wow,wut,-1);
    int x2 = dude(wut,wow,x1);
    for(int i = x1+1; i < wow.size(); i++) {
        ans.push_back(wow[i]);
    }
    for(int i = 0; i <= x1; i++) {
        ans.push_back(wow[i]);
    }
    for(int i = x2; i < wut.size(); i++) {
        ans.push_back(wut[i]);
    }
    for(int i = 0; i < x2; i++) {
        ans.push_back(wut[i]);
    }
    return ans;
}

Compilation message (stderr)

longesttrip.cpp: In function 'int dude(std::vector<int>&, std::vector<int>&, int)':
longesttrip.cpp:11:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   11 |         for(int i = 0; i < wut.size(); i++) {
      |                        ~~^~~~~~~~~~~~
longesttrip.cpp: In function 'std::vector<int> longest_trip(int, int)':
longesttrip.cpp:95:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   95 |         for(int i = 0; i < wut.size(); i++) {
      |                        ~~^~~~~~~~~~~~
longesttrip.cpp:101:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  101 |         for(int i = 0; i < wow.size(); i++) {
      |                        ~~^~~~~~~~~~~~
longesttrip.cpp:104:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  104 |         for(int i = 0; i < wut.size(); i++) {
      |                        ~~^~~~~~~~~~~~
longesttrip.cpp:120:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  120 |     for(int i = 0; i < wow.size(); i++) {
      |                    ~~^~~~~~~~~~~~
longesttrip.cpp:123:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  123 |     for(int i = 0; i < wut.size(); i++) {
      |                    ~~^~~~~~~~~~~~
longesttrip.cpp:136:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  136 |     for(int i = x1+1; i < wow.size(); i++) {
      |                       ~~^~~~~~~~~~~~
longesttrip.cpp:142:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  142 |     for(int i = x2; i < wut.size(); i++) {
      |                     ~~^~~~~~~~~~~~

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