Submission #637465

#TimeUsernameProblemLanguageResultExecution timeMemory
637465Ozy수천개의 섬 (IOI22_islands)C++17
26 / 100
33 ms7504 KiB
#include "islands.h" #include <bits/stdc++.h> using namespace std; #define rep(i,a,b) for (int i = (a); i <= (b); i++) #define repa(i,a,b) for (int i = (a); i >= (b); i--) #define debug(a) cout << #a << " = " << a << endl #define debugsl(a) cout << #a << " = " << a << ", " #define lli long long int #define MAX 100000 #define des first #define id second int n,m; vector<pair<int,int> > hijos[MAX]; vector<int> res; bool solve(int pos,int padre) { lli cont = 0; pair<int,int> obj[2],regreso[2]; for (auto h : hijos[pos]){ if (h.des == padre) continue; obj[cont] = h; cont++; if (cont == 2) break; } //tomar en cuenta que puede ser la misma balsa y estar usada if (cont == 0) return false; if (cont == 1) { //caso en el cual sigues avanzando por ahi res.push_back(obj[0].id); if (solve(obj[0].des,pos)) { res.push_back(obj[0].id); return true; } else { res.pop_back(); return false; } } //caso en el que tu empiezas a ser true for (auto h : hijos[obj[0].des]) { if (h.des == pos) { regreso[0] = {pos,h.id}; break; } } for (auto h : hijos[obj[1].des]) { if (h.des == pos && h != regreso[0]) { regreso[1] = {pos,h.id}; break; } } //pon la secuencia int a = obj[0].id; int b = regreso[0].id; int c = obj[1].id; int d = regreso[1].id; res.push_back(a); res.push_back(b); res.push_back(c); res.push_back(d); res.push_back(b); res.push_back(a); res.push_back(d); res.push_back(c); return true; } std::variant<bool, std::vector<int>> find_journey(int N, int M, std::vector<int> U, std::vector<int> V) { n = N; m = M; rep(i,0,m-1) hijos[U[i]].push_back({V[i],i}); if (solve(0,-1)) return res; else return false; }
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