Submission #613803

#	Time	Username	Problem	Language	Result	Execution time	Memory
613803		Koosha_mv	Comparing Plants (IOI20_plants)	C++14	25 / 100	475 ms	8688 KiB

plants

#include "plants.h"
#include <bits/stdc++.h>
using namespace std;
#define dbgv(v) cout<<#v<<" = "; f(i,0,int(v.size())) cout<<v[i]<<" "; cout<<endl
#define dbga(a,x,y) cout<<#a<<" = "; f(i,x,y) cout<<a[i]<<" "; cout<<endl
#define erorp(x) cout<<#x<<"={"<<x.F<<" , "<<x.S<<"}"<<endl
#define eror(x) cout<<#x<<'='<<(x)<<endl
#define f_(i,a,b) for(int i=a;i>=b;i--)
#define f(i,a,b) for(int i=a;i<b;i++)
#define nb(x) __builtin_popcount(x)
#define all(v) v.begin(),v.end()
#define bit(n,k) (((n)>>(k))&1)
#define Add(x,y) x=(x+y)%mod
#define maxm(a,b) a=max(a,b)
#define minm(a,b) a=min(a,b)
#define lst(x) x[x.size()-1]
#define sz(x) int(x.size())
#define mp make_pair
#define ll long long
#define pb push_back
#define S second
#define F first

const int N=5050,lg=20;

int n,k,p[N],a[N],pos[N],vis[N][N];
pair<int,int> A[lg][N],B[lg][N];

void builda(){
	int last=0;
	f_(T,n-1,0){
		f(i,0,2*n){
			if(p[i%n]==0){
				if(i>=n && i-last>=k){
					a[i-n]=T;
					f(j,0,k){
						p[(i-j)%n]--;
					}
					break ;
				}
				last=i;
			}
		}
	}
	f(i,0,n) pos[a[i]]=i;
	//dbga(a,0,n);
}
void AB(){
	set<int> s;
	f(i,0,k-1) s.insert(a[i]);
	f_(i,n-1,0){
		int ida=-1,idb=-1;
		if(*s.begin()<a[i]){
			ida=pos[*prev(s.lower_bound(a[i]))];
		}
		if(*s.rbegin()>a[i]){
			idb=pos[*s.lower_bound(a[i])];
		}
		s.insert(a[i]);
		s.erase(a[(i+k-1)%n]);
		if(ida==-1){
			A[0][i]={i,0};
		}
		else{
			A[0][i]={ida,(ida-i+n)%n};
		}
		if(idb==-1){
			B[0][i]={i,0};
		}
		else{
			B[0][i]={idb,(idb-i+n)%n};
		}
	}
	f(l,1,lg){
		f(i,0,n){
			A[l][i]={A[l-1][A[l-1][i].F].F,A[l-1][i].S+A[l-1][A[l-1][i].F].S};
			B[l][i]={B[l-1][B[l-1][i].F].F,B[l-1][i].S+B[l-1][B[l-1][i].F].S};
		}
	}
}
bool checkA(int u,int v){
	int len=(v-u+n)%n;
	f_(l,lg-1,0){
		if(A[l][u].S<=len){
			len-=A[l][u].S;
			u=A[l][u].F;
		}
	}
	if((v-u+n)%n<k && a[u]>=a[v]) return 1;
	return 0;
}
bool checkB(int u,int v){
	int len=(v-u+n)%n;
	f_(l,lg-1,0){
		if(B[l][u].S<=len){
			//cout<<l<<" "<<u<<" -> "<<B[l][u].F<<" "<<B[l][u].S<<endl;
			len-=B[l][u].S;
			u=B[l][u].F;
		}
	}
	//eror(u);
	if((v-u+n)%n<k && a[u]<=a[v]) return 1;
	return 0;
}
void init(int _k,vector<int> _p) {
	n=_p.size(),k=_k;
	f(i,0,n) p[i]=_p[i];
	builda();
	AB();
	//cout<<checkB(1,2)<<"!"<<endl;
}

int compare_plants(int x, int y) {
	if(checkA(x,y) || checkB(y,x)) return 1;
	if(checkB(x,y) || checkA(y,x)) return -1;
	return 0;
}

• Subtask 1: 0 / 5
• Subtask 2: 14 / 14
• Subtask 3: 0 / 13
• Subtask 4: 0 / 17
• Subtask 5: 11 / 11
• Subtask 6: 0 / 15
• Subtask 7: 0 / 25