Submission #1062031

#TimeUsernameProblemLanguageResultExecution timeMemory
1062031jamjanekThousands Islands (IOI22_islands)C++17
0 / 100
1093 ms11988 KiB
#include "islands.h" #include<bits/stdc++.h> using namespace std; int stopien_wyjscia[100010]; vector<pair<int, int>>graf[100010], graf1[100010]; bool usuniete[100010]; variant<bool, std::vector<int>> find_journey(int n, int m, std::vector<int> U, std::vector<int> V) { int i; for(i=0;i<m;i++){ graf[U[i]].push_back({V[i], i}); graf1[V[i]].push_back({U[i], i}); stopien_wyjscia[U[i]]++; //graf[V[i]].push_back({U[i], i+1}); } int start = 0; queue<int>kolejka; //for(i=0;i<n;i++) // if(stopien_wyjscia[i]==0) // kolejka.push(i); while(true){ if(stopien_wyjscia[start]==0)return false; if(stopien_wyjscia[start]==1){ //for(auto j: graf1[start]) // if(--stopien_wyjscia[j.first]==0) // kolejka.push(j.first); usuniete[start] = 1; for(auto j: graf[start]) if(!usuniete[j.first]){ start = j.first; break; } continue; } if(!kolejka.size())break; auto x = kolejka.front(); kolejka.pop(); usuniete[x] = 1; for(auto j: graf1[x]) if(--stopien_wyjscia[j.first]==0) kolejka.push(j.first); } return stopien_wyjscia[start]>=2; }
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