Submission #424772

#TimeUsernameProblemLanguageResultExecution timeMemory
424772vanicRail (IOI14_rail)C++14
100 / 100
129 ms640 KiB
#include "rail.h" #include <vector> #include <cmath> #include <algorithm> #include <iostream> #include <cassert> using namespace std; const int maxn=5e3+5; pair < int, int > dist[maxn]; vector < int > desne; vector < int > lijeve; vector < int > pot; void findLocation(int n, int pos, int sol1[], int sol2[]){ for(int i=1; i<n; i++){ dist[i-1]={getDistance(0, i), i}; } sol1[0]=pos; sol2[0]=1; sort(dist, dist+n-1); int l=0; lijeve.push_back(l); int d=dist[0].second; int x; sol1[d]=pos+dist[0].first; sol2[d]=2; desne.push_back(d); int q1, q2; bool p; for(int i=1; i<n-1; i++){ x=dist[i].second; // cout << "na " << x << endl; q1=getDistance(l, x); q2=getDistance(d, x); for(int j=0; j<(int)desne.size(); j++){ if(sol1[desne[j]]-sol1[l]<q1 && (!j || sol1[desne[j]]*2-q1-sol1[l]>sol1[desne[j-1]])){ pot.push_back(sol1[desne[j]]*2-q1-sol1[l]); } } p=0; for(int j=0; j<(int)pot.size(); j++){ if(sol1[d]-pot[j]==q2){ assert(!p); assert(pot[j]>=0); p=1; sol1[x]=pot[j]; sol2[x]=1; lijeve.push_back(x); int poz=lijeve.size()-1; while(poz>0 && sol1[lijeve[poz]]<sol1[lijeve[poz-1]]){ swap(lijeve[poz], lijeve[poz-1]); poz--; } l=lijeve[0]; } } pot.clear(); if(p){ continue; } for(int j=0; j<(int)lijeve.size(); j++){ if(sol1[d]-sol1[lijeve[j]]<q2 && (j==(int)lijeve.size()-1 || sol1[lijeve[j]]*2+q2-sol1[d]<sol1[lijeve[j+1]])){ pot.push_back(sol1[lijeve[j]]*2+q2-sol1[d]); } } for(int j=0; j<(int)pot.size(); j++){ if(pot[j]-sol1[l]==q1){ assert(!p); p=1; sol1[x]=pot[j]; sol2[x]=2; desne.push_back(x); int poz=desne.size()-1; while(poz>0 && sol1[desne[poz]]<sol1[desne[poz-1]]){ swap(desne[poz], desne[poz-1]); poz--; } d=desne.back(); } } pot.clear(); if(p){ continue; } if(q1-dist[i].first==sol1[0]-sol1[l]){ sol1[x]=sol1[l]+q1; sol2[x]=2; desne.push_back(x); int poz=desne.size()-1; while(poz>0 && sol1[desne[poz]]<sol1[desne[poz-1]]){ swap(desne[poz], desne[poz-1]); poz--; } d=desne.back(); } else{ sol1[x]=sol1[d]-q2; sol2[x]=1; lijeve.push_back(x); int poz=lijeve.size()-1; while(poz>0 && sol1[lijeve[poz]]<sol1[lijeve[poz-1]]){ swap(lijeve[poz], lijeve[poz-1]); poz--; } l=lijeve[0]; } // cout << l << ' ' << d << endl; } /* cout << "kraj--------" << endl; for(int i=0; i<n; i++){ cout << sol2[i] << ' ' << sol1[i] << endl; }*/ }
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