Submission #110178

#TimeUsernameProblemLanguageResultExecution timeMemory
110178ArturgoDreaming (IOI13_dreaming)C++14
0 / 100
63 ms15896 KiB
#include "dreaming.h" #include <vector> #include <algorithm> #include <iostream> using namespace std; vector<pair<int, int>> voisins[100 * 1000]; bool estPasse[100 * 1000]; int diamDeb, diamFin, diamTaille = 0; pair<int, int> calcDiam(int noeud, int parent = -1) { estPasse[noeud] = true; pair<int, int> melFeuille = {noeud, 0}; for(pair<int, int> voisin : voisins[noeud]) { if(voisin.first == parent) continue; pair<int, int> resFeuille = calcDiam(voisin.first, noeud); resFeuille.second += voisin.second; if(resFeuille.second + melFeuille.second >= diamTaille) { diamTaille = resFeuille.second + melFeuille.second; diamDeb = resFeuille.first; diamFin = melFeuille.first; } if(resFeuille.second > melFeuille.second) { melFeuille = resFeuille; } } return melFeuille; } bool calcChemin(int deb, int fin, vector<int>& chemin, int parent = -1) { if(deb == fin) return true; for(pair<int, int> voisin : voisins[deb]) { if(voisin.first == parent) continue; if(calcChemin(voisin.first, fin, chemin, deb)) { chemin.push_back(voisin.second); return true; } } return false; } int travelTime(int nbVilles, int nbRoutes, int nouvTaille, int debs[], int fins[], int temps[]) { for(int iRoute = 0;iRoute < nbRoutes;iRoute++) { voisins[debs[iRoute]].push_back({fins[iRoute], temps[iRoute]}); voisins[fins[iRoute]].push_back({debs[iRoute], temps[iRoute]}); } vector<int> rayons; for(int iVille = 0;iVille < nbVilles;iVille++) { if(estPasse[iVille]) continue; diamTaille = 0; diamDeb = diamFin = iVille; calcDiam(iVille); vector<int> chemin; calcChemin(diamDeb, diamFin, chemin); int somme = 0; int rayon = 1000 * 1000 * 1000; for(int val : chemin) { somme += val; rayon = min(rayon, max(somme, diamTaille - somme)); } rayons.push_back(-rayon); } sort(rayons.begin(), rayons.end()); if(rayons.size() == 1) return -rayons[0]; if(rayons.size() == 2) { return nouvTaille - rayons[0] - rayons[1]; } return max(nouvTaille - rayons[0] - rayons[1], 2 * nouvTaille - rayons[1] - rayons[2]); }
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