Submission #847592

#	Time	Username	Problem	Language	Result	Execution time	Memory
847592		ibm2006	Longest Trip (IOI23_longesttrip)	C++17	85 / 100	18 ms	860 KiB

longesttrip

#include "longesttrip.h"
#include<bits/stdc++.h>
using namespace std;
typedef int ll;
ll n,i,j,k,s,t,x,y,z,w;
deque<ll> dq1,dq2;
vector<ll>v;
pair<ll,ll> p;
pair<ll,ll> inv(pair<ll,ll> p)
{
    return {p.second,p.first};
}
pair<ll,ll> adj(vector<ll> a,vector<ll> b)
{
    ll k=0;
    if(a.size()<b.size())
        {swap(a,b);  k=1;}
    if(a.size()==1&&b.size()==1)
    return {a[0],b[0]};
    vector<ll>c;
    for(i=0;i<a.size()/2;i++)
        c.push_back(a[i]);
    if(are_connected(c,b))
    {
        if(k==1)
        {
            return inv(adj(c,b));
        }
        else
            return adj(c,b);
    }
    else
    {
        c.clear();
        for(i=a.size()/2;i<a.size();i++)
            c.push_back(a[i]);
        if(k==1)
        {
            return inv(adj(c,b));
        }
        else
            return adj(c,b);
    }
}
vector<ll> vectorize(deque<ll> d)
{
    ll i;
    vector<ll> v;
    for(i=0;i<d.size();i++)
        v.push_back(d[i]);
    return v;
}
void combine()
{
    for(auto x:dq2)
        dq1.push_front(x);
    dq2.clear();
}
void answer()
{
    ll i;
    v.clear();
    for(i=0;i<dq1.size();i++)
    {
        v.push_back(dq1[i]);
    }
}
void init()
{
    dq1.clear();
    dq2.clear();
    v.clear();
    s=0;
    t=0;
}
vector<ll> longest_trip(ll N, ll D)
{
    init();
    n=N;
    dq1.push_back(0);
    dq2.push_back(1);
    for(i=2;i<n;i++)
    {
        if(are_connected({dq1[0]},{dq2[0]}))
        {
        combine();
        dq2.push_back(i);
        continue;
        }
        if(are_connected({dq1[0]},{i}))
            {
                dq1.push_front(i);
                continue;
            }
            dq2.push_front(i);
    }
    if(dq1.size()<dq2.size())
        swap(dq1,dq2);
        if(!are_connected(vectorize(dq1),vectorize(dq2)))
        {
            answer();
            return v;
        }
        /*for(ll x:dq1)
            printf("%d ",x);
        printf("\n");
        for(ll x:dq2)
            printf("%d ",x);
        printf("\n");*/
    if(dq2.size()==1)
    {
        if(are_connected({dq1[0]},{dq2[0]}))
        {
            dq1.push_front(dq2[0]);
        }
        else if(are_connected({dq1[dq1.size()-1]},{dq2[0]}))
            {
                dq1.push_back(dq2[0]);
            }
            else
            {
                for(i=0;i<dq1.size();i++)
                {
                    v.push_back(dq1[i]);
                }
                x=adj(vectorize(dq1),vectorize(dq2)).first;
                v.clear();
                v.push_back(dq2[0]);
                for(i=0;i<dq1.size();i++)
                {
                    if(dq1[i]==x)
                    {
                        t=1;
                    }
                    if(t==1)
                        v.push_back(dq1[i]);
                }
                for(i=0;i<dq1.size();i++)
                {
                    if(dq1[i]==x)
                        t=0;
                    if(t==1)
                        v.push_back(dq1[i]);
                }
                return v;
            }
        answer();
        return v;
    }
    if(are_connected({dq1[0]},{dq2[0]}))
        {
            for(auto x:dq2)
                dq1.push_front(x);
            answer();
            return v;
        }
        else if(are_connected({dq1[0]},{dq2[dq2.size()-1]}))
            {
                for(i=dq2.size()-1;i>=0;i--)
                {
                    dq1.push_front(dq2[i]);
                }
                answer();
               return v;
            }
    else if(are_connected({dq1[dq1.size()-1]},{dq2[0]}))
        {
            for(auto x:dq2)
                dq1.push_back(x);
            answer();
            return v;
        }
    else if(are_connected({dq1[dq1.size()-1]},{dq2[dq2.size()-1]}))
        {
            for(i=dq2.size()-1;i>=0;i--)
                {
                    dq1.push_back(dq2[i]);
                }
                answer();
               return v;
        }
    else
    {
        p=adj(vectorize(dq1),vectorize(dq2));
        x=p.first;
        y=p.second;
        //printf("%d %d\n",x,y);
        t=0;
        for(i=0;i<dq1.size();i++)
        {
            if(t==1)
            {
                v.push_back(dq1[i]);
            }
            if(dq1[i]==x)
                t=1;
        }
        for(i=0;i<dq1.size();i++)
        {
            if(t==1)
                v.push_back(dq1[i]);
            if(dq1[i]==x)
                t=0;
        }
        for(i=0;i<dq2.size();i++)
        {
            if(dq2[i]==y)
                t=1;
            if(t==1)
            {
                v.push_back(dq2[i]);
            }
        }
        for(i=0;i<dq2.size();i++)
        {
            if(dq2[i]==y)
                t=0;
                if(t==1)
                    v.push_back(dq2[i]);
        }
        return v;
    }
}

Compilation message (stderr)

longesttrip.cpp: In function 'std::pair<int, int> adj(std::vector<int>, std::vector<int>)':
longesttrip.cpp:21:14: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |     for(i=0;i<a.size()/2;i++)
      |             ~^~~~~~~~~~~
longesttrip.cpp:35:27: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |         for(i=a.size()/2;i<a.size();i++)
      |                          ~^~~~~~~~~
longesttrip.cpp: In function 'std::vector<int> vectorize(std::deque<int>)':
longesttrip.cpp:49:14: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::deque<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |     for(i=0;i<d.size();i++)
      |             ~^~~~~~~~~
longesttrip.cpp: In function 'void answer()':
longesttrip.cpp:63:14: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::deque<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |     for(i=0;i<dq1.size();i++)
      |             ~^~~~~~~~~~~
longesttrip.cpp: In function 'std::vector<int> longest_trip(ll, ll)':
longesttrip.cpp:97:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   97 |     if(dq1.size()<dq2.size())
      |     ^~
longesttrip.cpp:99:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   99 |         if(!are_connected(vectorize(dq1),vectorize(dq2)))
      |         ^~
longesttrip.cpp:122:26: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::deque<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  122 |                 for(i=0;i<dq1.size();i++)
      |                         ~^~~~~~~~~~~
longesttrip.cpp:129:26: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::deque<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  129 |                 for(i=0;i<dq1.size();i++)
      |                         ~^~~~~~~~~~~
longesttrip.cpp:138:26: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::deque<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  138 |                 for(i=0;i<dq1.size();i++)
      |                         ~^~~~~~~~~~~
longesttrip.cpp:189:18: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::deque<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  189 |         for(i=0;i<dq1.size();i++)
      |                 ~^~~~~~~~~~~
longesttrip.cpp:198:18: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::deque<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  198 |         for(i=0;i<dq1.size();i++)
      |                 ~^~~~~~~~~~~
longesttrip.cpp:205:18: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::deque<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  205 |         for(i=0;i<dq2.size();i++)
      |                 ~^~~~~~~~~~~
longesttrip.cpp:214:18: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::deque<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  214 |         for(i=0;i<dq2.size();i++)
      |                 ~^~~~~~~~~~~
longesttrip.cpp:216:13: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  216 |             if(dq2[i]==y)
      |             ^~
longesttrip.cpp:218:17: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
  218 |                 if(t==1)
      |                 ^~

• Subtask 0: 0 / 0
• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 25 / 25
• Subtask 4: 45 / 60