Submission #134825

#	Time	Username	Problem	Language	Result	Execution time	Memory
134825		Boxworld	Seats (IOI18_seats)	C++14	0 / 100	4098 ms	56756 KiB

seats

#include "seats.h"
#include <bits/stdc++.h>
using namespace std;
const int maxN=1000100;
int h,w,Hi,Hx,Wi,Wx;
struct point{int x,y;}P[maxN];
struct node{int hi,hx,wi,wx;}A[maxN*4];
inline int ls(int p){return p*2+1;}
inline int rs(int p){return p*2+2;}
void push_up(int p){
	A[p].wi=min(A[ls(p)].wi,A[rs(p)].wi);
	A[p].wx=max(A[ls(p)].wx,A[rs(p)].wx);
}
void build(int p,int l,int r){
	if (l==r){
		A[p].wi=A[p].wx=P[l].y;
		return;
	}
	int m=(l+r)/2;
	if (l<=m)build(ls(p),l,m);
	if (m<r)build(rs(p),m+1,r);
	push_up(p);
}
void update(int p,int l,int r,int ta){
	if (l==ta&&ta==r){
		A[p].wi=A[p].wx=P[l].y;
		return;
	}
	int m=(l+r)/2;
	if (l<=ta&&ta<=m)update(ls(p),l,m,ta);
	if (m+1<=ta&&ta<=r)update(rs(p),m+1,r,ta);
	push_up(p);
}
void query(int p,int l,int r,int tl,int tr){
	if (tl<=l&&r<=tr){
		Wi=min(Wi,A[p].wi);
		Wx=max(Wx,A[p].wx);
		return;
	}
	int m=(l+r)/2;
	if (tl<=m)query(ls(p),l,m,tl,tr);
	if (m<tr)query(rs(p),m+1,r,tl,tr);
}
void give_initial_chart(int H, int W, std::vector<int> R, std::vector<int> C) {
	h=H;w=W;
	for (int i=0;i<H*W;i++){P[i].x=R[i];P[i].y=C[i];}
	build(0,0,h*w-1);
}

int swap_seats(int a, int b){
	int t=a,ans=0;
	swap(P[a],P[b]);
	update(0,0,h*w-1,a);
	update(0,0,h*w-1,b);
	for (int i=0;i<h*w;){
		Wi=P[0].y,Wx=P[0].y;
		query(0,0,h*w-1,0,i);
		if (Wx-Wi+1==i){ans++;i++;}
		else i=Wx-Wi;
	}
	return ans;
}

Compilation message (stderr)

seats.cpp: In function 'int swap_seats(int, int)':
seats.cpp:51:6: warning: unused variable 't' [-Wunused-variable]
  int t=a,ans=0;
      ^

• Subtask 1: 0 / 5
• Subtask 2: 0 / 6
• Subtask 3: 0 / 20
• Subtask 4: 0 / 6
• Subtask 5: 0 / 33
• Subtask 6: 0 / 30