Submission #116940

#	Time	Username	Problem	Language	Result	Execution time	Memory
116940		dragonslayerit	Robots (IOI13_robots)	C++14	90 / 100	3024 ms	14072 KiB

robots

#include "robots.h"
#include <map>
#include <vector>
#include <algorithm>
#include <array>

const int INF=2e9+7;

std::array<int,3> objects[1100005];
int objects_cnt=0;

int putaway(int A, int B, int T, int X[], int Y[], int W[], int S[]) {
  int low=0,high=T+1;
  while(high-low>1){
    int mid=(low+high)/2;
    objects_cnt=0;
    for(int i=0;i<A;i++){
      objects[objects_cnt++]={X[i]-1,INF,mid};
    }
    for(int i=0;i<B;i++){
      objects[objects_cnt++]={INF,Y[i]-1,mid};
    }
    for(int i=0;i<T;i++){
      objects[objects_cnt++]={W[i],S[i],-1};
    }
    std::sort(objects,objects+A+B+T);
    std::reverse(objects,objects+A+B+T);
    std::map<int,int> active;
    bool bad=false;
    for(int i=0;i<A+B+T;i++){
      auto obj=objects[i];
      if(obj[2]>0){
	active[obj[1]]+=obj[2];
      }else{
	auto it=active.lower_bound(obj[1]);
	if(it==active.end()){
	  bad=true;
	  break;
	}else{
	  //printf("(%d,%d) matches with (?,%d)\n",obj[0],obj[1],it->first);
	  if(--it->second==0){
	    active.erase(it);
	  }
	}
      }
    }
    if(bad){
      low=mid;
    }else{
      high=mid;
    }
  }
  return (high<=T)?high:-1;
}

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 25 / 25
• Subtask 4: 37 / 37
• Subtask 5: 0 / 10