Submission #73185

#	Time	Username	Problem	Language	Result	Execution time	Memory
73185		Kmcode	Shortcut (IOI16_shortcut)	C++14	0 / 100	2 ms	248 KiB

shortcut

#include<bits/stdc++.h>
using namespace std;

//#include "shortcut.h"


vector<int> l;
vector<int> d;

#define MAX 1000002

long long int pref[MAX];
long long int bc[MAX];
long long int c;
int n;

long long int dp[MAX];

void init(){
	for(int i=0;i<d.size();i++){
		if(i)pref[i]=pref[i-1]+l[i-1];
		pref[i]=max(pref[i],(long long int)d[i]);
	}
	for(int i=d.size()-1;i>=0;i--){
		if(i!=d.size()-1){
			bc[i]=bc[i+1]+l[i];
		}
		bc[i]=max(bc[i],(long long int)d[i]);
	}
}

int pref_id(long long int z){
	return lower_bound(pref,pref+n,z)-pref;
}
int bc_id(long long int z){
	return lower_bound(bc,bc+n,z,greater<long long int>() )-bc;
}
bool ok(long long int cost){
	for(int i=0;i<n;i++){
		if(pref[i]>cost)break;
		for(int j=n-1;j>=i;j--){
			if(bc[i]>cost)break;
			if(max(i,pref_id(cost-pref[i]))>=min(j+1,bc_id(cost-pref[i]-c))-1){
				if(max(i-1,pref_id(cost-pref[i]-c))+1>=min(i+1,bc_id(cost-pref[i]))){
					return true;
				}
			}
		}
	}
	return false;
}


long long find_shortcut(int n2, std::vector<int> l2, std::vector<int> d2, int c2)
{
	n=d2.size();
	c=c2;
	l=l2;
	d=d2;
	n=d2.size();
	init();
	long long int mint=0;
	long long int maxt=111111111111LL;
	while(mint+1LL<maxt){
		long long int mid=(mint+maxt)/2LL;
		if(ok(mid)){
			maxt=mid;
		}
		else{
			mint=mid;
		}
	}
	if(ok(mint))return mint;
    return maxt;
}

Compilation message (stderr)

shortcut.cpp: In function 'void init()':
shortcut.cpp:20:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<d.size();i++){
              ~^~~~~~~~~
shortcut.cpp:25:7: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(i!=d.size()-1){
      ~^~~~~~~~~~~~

• Subtask 1: 0 / 9
• Subtask 2: 0 / 14
• Subtask 3: 0 / 8
• Subtask 4: 0 / 7
• Subtask 5: 0 / 33
• Subtask 6: 0 / 22
• Subtask 7: 0 / 4
• Subtask 8: 0 / 3