Submission #845777

#	Time	Username	Problem	Language	Result	Execution time	Memory
845777		leinad2	Longest Trip (IOI23_longesttrip)	C++17	15 / 100	12 ms	600 KiB

longesttrip

#include "longesttrip.h"

#include<bits/stdc++.h>
using namespace std;
int i, j, k, a, b, A[260][260], B[260];
vector<int> longest_trip(int N, int D)
{
    vector<int>v1, v2;
    v1.push_back(0);
    v2.push_back(1);
    bool flag=false;
    for(i=2;i<N;i++)
    {
        vector<int>X, Y, Z;
        X.push_back(v1.back());Y.push_back(i);Z.push_back(v2.back());
        if(are_connected(X, Y))v1.push_back(i);
        else if(flag)v2.push_back(i);
        else if(are_connected(Z, Y))
        {
            flag=true;
            v2.push_back(i);
        }
        else
        {
            while(v2.size())
            {
                v1.push_back(v2.back());
                v2.pop_back();
            }
            v2.push_back(i);
        }
    }
    for(i=0;i+1<v1.size();i++)assert(are_connected({v1[i]}, {v1[i+1]}));
    for(i=0;i+1<v2.size();i++)assert(are_connected({v2[i]}, {v2[i+1]}));
    if(are_connected(v1, v2)==0)
    {
        if(v1.size()<v2.size())swap(v1, v2);
        return v1;
    }
    vector<int>X, Y, Z, W;
    X.push_back(v1.back());
    Z.push_back(v2[0]);W.push_back(v2.back());
    if(are_connected(X, Z))
    {
        for(auto p:v2)v1.push_back(p);
        return v1;
    }
    if(are_connected(X, W))
    {
        while(v2.size())
        {
            v1.push_back(v2.back());
            v2.pop_back();
        }
        return v1;
    }
    if(are_connected(X, v2))
    {
        int s=0, e=v2.size()-1;
        while(s<e)
        {
            int m=s+e>>1;
            vector<int>V;
            for(i=0;i<=m;i++)V.push_back(v2[i]);
            if(are_connected(X, V))e=m;
            else s=m+1;
        }
        for(i=s;i<v2.size();i++)v1.push_back(v2[i]);
        for(i=0;i<s;i++)v1.push_back(v2[i]);
        return v1;
    }
    Y.push_back(v1[0]);
    if(are_connected(Y, v2))
    {
        int s=0, e=v2.size()-1;
        while(s<e)
        {
            int m=s+e>>1;
            vector<int>V;
            for(i=0;i<=m;i++)V.push_back(v2[i]);
            if(are_connected(Y, V))e=m;
            else s=m+1;
        }
        reverse(v1.begin(), v1.end());
        for(i=s;i<v2.size();i++)v1.push_back(v2[i]);
        for(i=0;i<s;i++)v1.push_back(v2[i]);
        return v1;
    }
    int s=0, e=v1.size()-1;
    while(s<e)
    {
        int m=s+e>>1;
        vector<int>V;
        for(i=0;i<=m;i++)V.push_back(v1[i]);
        if(are_connected(V, v2))e=m;
        else s=m+1;
    }
    int ss=s;
    s=0, e=v2.size()-1;
    X[0]=v1[s];
    while(s<e)
    {
        int m=s+e>>1;
        vector<int>V;
        for(i=0;i<=m;i++)V.push_back(v2[i]);
        if(are_connected(X, V))e=m;
        else s=m+1;
    }
    vector<int>ans;
    for(i=ss-1;i>=0;i--)ans.push_back(v1[i]);
    for(i=v1.size()-1;i>=ss;i--)ans.push_back(v1[i]);
    for(i=s;i<v2.size();i++)ans.push_back(v2[i]);
    for(i=0;i<s;i++)ans.push_back(v2[i]);
    v1=v2;
    return v2;
}

Compilation message (stderr)

longesttrip.cpp: In function 'std::vector<int> longest_trip(int, int)':
longesttrip.cpp:33:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |     for(i=0;i+1<v1.size();i++)assert(are_connected({v1[i]}, {v1[i+1]}));
      |             ~~~^~~~~~~~~~
longesttrip.cpp:34:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |     for(i=0;i+1<v2.size();i++)assert(are_connected({v2[i]}, {v2[i+1]}));
      |             ~~~^~~~~~~~~~
longesttrip.cpp:62:20: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   62 |             int m=s+e>>1;
      |                   ~^~
longesttrip.cpp:68:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   68 |         for(i=s;i<v2.size();i++)v1.push_back(v2[i]);
      |                 ~^~~~~~~~~~
longesttrip.cpp:78:20: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   78 |             int m=s+e>>1;
      |                   ~^~
longesttrip.cpp:85:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   85 |         for(i=s;i<v2.size();i++)v1.push_back(v2[i]);
      |                 ~^~~~~~~~~~
longesttrip.cpp:92:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   92 |         int m=s+e>>1;
      |               ~^~
longesttrip.cpp:103:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  103 |         int m=s+e>>1;
      |               ~^~
longesttrip.cpp:112:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  112 |     for(i=s;i<v2.size();i++)ans.push_back(v2[i]);
      |             ~^~~~~~~~~~

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