Submission #531846

#	Time	Username	Problem	Language	Result	Execution time	Memory
531846		mosiashvililuka	Aliens (IOI16_aliens)	C++14	0 / 100	2 ms	332 KiB

aliens

#include<bits/stdc++.h>
#include "aliens.h"
using namespace std;
long long a,b,c,d,e,i,j,ii,jj,zx,xc,M,k,pi,pr[1000009],pas,K,B,X,lef,rig,mid,LEF1,LEF2,RIG1,RIG2;
long long bofx[1000009];
pair <long long, long long> p[1000009],pp[1000009];
//vector <vector <long long> > dp,dp2;
vector <long long> dp,dp2;
deque <pair <pair <long long, long long> , long long> > de;
pair <long long, long long> P;
pair <long long, long long> DO(long long cost){
	for(i=0; i<=a+1; i++){
		dp[i]=a*a+3;
	}
	dp[0]=0;dp2[0]=0;
	de.clear();
	for(i=1; i<=a; i++){
		ii=i-1;
		K=(-2LL)*ii;B=dp[pr[ii]]+ii*ii;
		if(pr[ii]>ii) B-=(pr[ii]-ii)*(pr[ii]-ii);
		K=-K;B=-B;
		while(de.size()&&de.back().first.second<=B) de.pop_back();
		while(de.size()>=2){
			zx=(de[de.size()-1].first.second-B)*(K-de[de.size()-2].first.first);
			xc=(de[de.size()-2].first.second-B)*(K-de[de.size()-1].first.first);
			if(zx<=xc){
				de.pop_back();
			}else{
				break;
			}
		}
		de.push_back({{K,B},dp2[pr[ii]]});
		X=i;
		while(de.size()>=2){
			if(de[0].first.first*X+de[0].first.second<=de[1].first.first*X+de[1].first.second) de.pop_front(); else break;
		}
		if(bofx[i]==0){
			dp[i]=dp[i-1];dp2[i]=dp2[i-1];
			continue;
		}
		K=de[0].first.first;B=de[0].first.second;
		X=i;
		dp[i]=i*i-(K*X+B)+cost;dp2[i]=de[0].second+1;
	}
	//
	return {dp[a],dp2[a]};
}
long long take_photos(int Nn, int Mm, int Kk, std::vector<int> Rr, std::vector<int> Cc) {
	M=Nn;a=Mm;k=Kk;
	dp.resize(a+3);dp2.resize(a+3);
	/*for(i=0; i<a+3; i++){
		dp[i].resize(min(k,a)+3);
		dp2[i].resize(min(k,a)+3);
	}*/
	for(i=1; i<=M; i++){
		if(Rr[i-1]>Cc[i-1]) swap(Rr[i-1],Cc[i-1]);
		pp[i]={Rr[i-1]+1,-Cc[i-1]-1};
	}
	sort(pp+1,pp+M+1);
	for(i=1; i<=M; i++) pp[i].second=-pp[i].second;
	for(i=1; i<=M; i++){
		if(pi!=0&&p[pi].second>=pp[i].second){
			
		}else{
			pi++;p[pi]=pp[i];
		}
	}
	/*cout<<"rewrew "<<pi<<"\n";
	for(i=1; i<=pi; i++) cout<<p[i].first<<" "<<p[i].second<<"\n";*/
	for(i=1; i<=pi; i++){
		pr[p[i].first]=p[i].second;
		bofx[p[i].second]=p[i].first;
	}
	for(i=1; i<=a; i++){
		pr[i]=max(pr[i],pr[i-1]);
	}
	P=DO(0);LEF1=P.first;LEF2=P.second;
	//cout<<"0 0 0      "<<P.first<<" "<<P.second<<"\n\n";
	if(P.second<=k){
		return P.first;
	}
	lef=0;rig=a*a+1;
	while(1){
		if(lef+1>=rig) break;
		mid=(lef+rig)/2;
		P=DO(mid);
		//cout<<lef<<" "<<rig<<" "<<mid<<"      "<<P.first<<" "<<P.second<<"\n";
		if(P.second<=k){
			rig=mid;RIG1=P.first;RIG2=P.second;
		}else{
			lef=mid;LEF1=P.first;LEF2=P.second;
		}
	}
	//
	if(RIG2==k){
		pas=RIG1-RIG2*rig;
	}else{
		pas=RIG1-k*rig;
	}
	return pas;
}

• Subtask 1: 0 / 4
• Subtask 2: 0 / 12
• Subtask 3: 0 / 9
• Subtask 4: 0 / 16
• Subtask 5: 0 / 19
• Subtask 6: 0 / 40