Submission #428459

#	Time	Username	Problem	Language	Result	Execution time	Memory
428459		kshitij_sodani	Shortcut (IOI16_shortcut)	C++14	71 / 100	2057 ms	1868 KiB

shortcut

#include <bits/stdc++.h>
using namespace std;
typedef long long llo;
#define a first
#define b second
#define pb push_back


#include "shortcut.h"
llo pre[1000001];
int n;
llo it[1000001];
llo ind[1000001];
llo ind2[1000001];
llo ind3[1000001];
llo ind4[1000001];

llo ss;
llo ma[2][2];
bool check(llo mid){

	llo ma=-1e18;
	llo ma2=-1e18;
	llo ma3=-1e18;
	llo ma4=-1e18;
	llo st=1;
	for(int i=0;i<n;i++){
		for(int j=i+1;j<n;j++){
			/*if(i==1 and j==3){
				cout<<pre[j]-pre[i]+it[i]+it[j]<<":"<<endl;
			}*/
			if(pre[j]-pre[i]+it[i]+it[j]>mid){
				st=0;
				ma=max(ma,pre[i]+pre[j]+it[i]+it[j]);
				ma2=max(ma2,pre[i]-pre[j]+it[i]+it[j]);
				ma3=max(ma3,-pre[i]-pre[j]+it[i]+it[j]);
				ma4=max(ma4,-pre[i]+pre[j]+it[i]+it[j]);
			}
		}
	}
	if(st==1){
		return true;
	}
	//return false;
	ma=mid-ma-ss;
	ma=-ma;
	ma2=mid-ma2-ss;
	ma2=-ma2;
	ma3=mid-ma3-ss;
	ma4=mid-ma4-ss;
	//-pre[i]-pre[j]<=ma
	//pre[i]+pre[j]>=ma
	//pre[i]+pre[j]<=ma3

	//-pre[i]+pre[j]<=ma2
	//pre[i]-pre[j]>=ma2
	//pre[i]-pre[j]<=ma4

/*	llo ind=0;
	llo ind3=0;
	llo ind2=0;
	llo ind4=0;*/
	if(pre[n-1]+pre[n-2]<ma){
		return false;
	}
	if(ma>ma3 or ma2>ma4){
		return false;
	}
	llo cur=0;
	for(int i=n-1;i>=0;i--){
		while(cur<i){
			if(pre[cur]+pre[i]<ma){
				cur++;
			}
			else{
				break;
			}
		}
		ind[i]=cur;
	}
	cur=0;
	for(int i=n-1;i>=0;i--){
		//cur=0;
		while(cur<i){
			if(pre[cur+1]+pre[i]<=ma3){
				cur++;
			}
			else{
				break;
			}
		}
		ind3[i]=cur;
	}
	cur=0;
	for(int i=0;i<n;i++){
		while(cur<i){
			if(pre[cur]-pre[i]<ma2){
				cur++;
			}
			else{
				break;
			}
		}
		ind2[i]=cur;
	}
	cur=0;
	for(int i=0;i<n;i++){
		while(cur<i){
			if(pre[cur+1]-pre[i]<=ma4){
				cur++;
			}
			else{
				break;
			}
		}
		ind4[i]=cur;
	}

	for(int i=1;i<n;i++){
		/*while(ind<i){
			if(pre[i]+pre[ind]<ma){
				ind++;

			}
			else{
				break;
			}
		}
		while(ind3<i){
			if(pre[i]+pre[ind3+1]<=ma3){
				ind3++;
			}
			else{
				break;
			}
		}*/
		/*while(ind2+1<i){
			if(pre[i]-pre[ind2]>ma4){
				ind2--;
			}
		}
		if(pre[])
*/

		for(int j=0;j<i;j++){
			if(j>=ind[i]){//pre[i]+pre[j]>=ma){
				if(j<=ind3[i]){//pre[i]+pre[j]<=ma3){
					//if(j>=ind){//} and j<=ind3 and pre[ind3]+pre[i]<=ma3){
						if(ind2[i]<=j){//pre[j]-pre[i]>=ma2){
							if(j<=ind4[i]){//pre[j]-pre[i]<=ma4){
								return true;
							}
						}
					//}
				}
			}
		}
	}
	

	//ma to ma3 range





	return false;



}
long long find_shortcut(int nn, std::vector<int> l, std::vector<int> d, int c)
{
	n=nn;
	pre[0]=0;
	ss=c;
	for(int i=1;i<n;i++){
		pre[i]=pre[i-1]+l[i-1];
	}

	for(int i=0;i<n;i++){
		it[i]=d[i];
	}

	llo low=-1;
	for(int i=52;i>=0;i--){
		if(check(low+(1LL<<i))==false){
			low+=(1LL<<i);
		}
	}



    return low+1;
}

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