Submission #813065

#	Time	Username	Problem	Language	Result	Execution time	Memory
813065		andrei_boaca	수천개의 섬 (IOI22_islands)	C++17	0 / 100	13 ms	15724 KiB

islands

#include "islands.h"

#include <variant>
#include <vector>
#include <algorithm>
#include <assert.h>
#include <map>
//#include <bits/stdc++.h>
//#include "grader.cpp"
using namespace std;
int n,m;
map<int,vector<int>> c[100005];
vector<int> muchii[100005];
vector<int> sol;
void n2(int x,int y)
{
    int A=c[1][0][0];
    int B=c[0][1][0];
    int C=c[0][1][1];
    vector<int> aux={B,A,C,B,A,C};
    for(int i:aux)
        sol.push_back(i);
}
bool use[100005];
vector<int> lant;
bool good;
bool inst[100005];
int from[100005];
int who;
void s1(int nod)
{
    if(good)
        return;
    use[nod]=1;
    inst[nod]=1;
    for(int i:muchii[nod])
    {
        if(!inst[i])
        {
            if(c[nod][i].size()>=2&&c[i][nod].size()>=1)
            {
                who=i;
                good=1;
                int x=nod;
                while(true)
                {
                    lant.push_back(x);
                    if(x==0)
                        break;
                    x=from[x];
                }
                return;
            }
            if(!use[i])
                s1(i);
        }
    }
}
std::variant<bool, std::vector<int>> find_journey(int N, int M, std::vector<int> U, std::vector<int> V)
{
    n=N;
    m=M;
    for(int i=0;i<m;i++)
    {
        int a=U[i],b=V[i];
        c[a][b].push_back(i);
        if(c[a][b].size()==1)
            muchii[a].push_back(b);
    }
    s1(0);
    if(good)
    {
        reverse(lant.begin(),lant.end());
        for(int i=1;i<lant.size();i++)
            sol.push_back(c[lant[i-1]][lant[i]][0]);
        n2(lant.back(),who);
        reverse(lant.begin(),lant.end());
        for(int i=1;i<lant.size();i++)
            sol.push_back(c[lant[i]][lant[i-1]][0]);
        return sol;
    }
}

Compilation message (stderr)

islands.cpp: In function 'std::variant<bool, std::vector<int, std::allocator<int> > > find_journey(int, int, std::vector<int>, std::vector<int>)':
islands.cpp:74:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   74 |         for(int i=1;i<lant.size();i++)
      |                     ~^~~~~~~~~~~~
islands.cpp:78:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   78 |         for(int i=1;i<lant.size();i++)
      |                     ~^~~~~~~~~~~~
islands.cpp:82:1: warning: control reaches end of non-void function [-Wreturn-type]
   82 | }
      | ^

• Subtask 1: 0 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 21
• Subtask 4: 0 / 24
• Subtask 5: 0 / 45