Submission #831487

#	Time	Username	Problem	Language	Result	Execution time	Memory
831487		tolbi	Seats (IOI18_seats)	C++17	0 / 100	4017 ms	28948 KiB

seats

#include <bits/stdc++.h>
using namespace std;
#include "seats.h"
#define tol(bi) (1LL<<((int)(bi)))
struct BIT{
	BIT(){}
	vector<vector<int>> arr;
	void init(int n, int m){
		arr.resize(n,vector<int>(m,0));
	}
	void update(int x, int y, int val){
		arr[x][y]=val;
	}
	int minq(int xl, int xr, int yl, int yr){
		int rval = 23232323;
		//cout<<xl<<" "<<xr<<" "<<yl<<" "<<yr<<endl;
		//cout<<arr.size()<<" "<<arr[0].size()<<endl;
		for (int i = xl; i <= xr; i++){
			for (int j = yl; j <= yr; j++){
				rval=min(rval,arr[i][j]);
			}
		}
		return rval;
	}
	int maxq(int xl, int xr, int yl, int yr){
		int rval = 0;
		//cout<<xl<<" "<<xr<<" "<<yl<<" "<<yr<<endl;
		//cout<<arr.size()<<" "<<arr[0].size()<<endl;
		for (int i = xl; i <= xr; i++){
			for (int j = yl; j <= yr; j++){
				rval=max(rval,arr[i][j]);
			}
		}
		return rval;
	}
};
vector<int> R,C;
BIT fenwik;
int H,W;
void give_initial_chart(int _H, int _W, std::vector<int> _R, std::vector<int> _C) {
	R=_R,C=_C;
	H=_H,W=_W;
	fenwik.init(H,W);
	for (int i = 0; i < R.size(); ++i)
	{
		fenwik.update(R[i],C[i],i);
	}
}
int swap_seats(int a, int b) {
	swap(R[a],R[b]);
	swap(C[a],C[b]);
	fenwik.update(R[a],C[a],a);
	fenwik.update(R[b],C[b],b);
	int n = R.size();
	int crmax = 0;
	int ans = 1;
	int xl=R[0],xr=R[0];
	int yl=C[0],yr=C[0];
	while (crmax<R.size()-1){
		int minel = 23232323;
		//cout<<crmax<<endl;
		//cout<<"ISTE GELDIK"<<endl;
		if (xl>0) minel=min(minel,fenwik.minq(0,xl-1,0,W-1));
		//cout<<"GIDIYORUZ"<<endl;
		if (xr+1<H) minel=min(minel,fenwik.minq(xr+1,H-1,0,W-1));
		//cout<<"BILINMEZ BIR"<<endl;
		if (yl>0) minel=min(minel,fenwik.minq(xl,xr,0,yl-1));
		//cout<<"DIYARA"<<endl;
		if (yr+1<W) minel=min(minel,fenwik.minq(xl,xr,yr+1,W-1));
		//cout<<"ESKIDEN KARPUR IDIK"<<endl;
		//cout<<xl<<" "<<xr<<" "<<yl<<" "<<yr<<endl;
		//cout<<crmax<<endl;
		//cout<<minel<<endl;
		xr=max(xr,R[minel]);
		xl=min(xl,R[minel]);
		yr=max(yr,C[minel]);
		yl=min(yl,C[minel]);
		crmax=fenwik.maxq(xl,xr,yl,yr);
		crmax=max(crmax,minel);
		if ((xr-xl+1)*(yr-yl+1)==crmax+1) ans++;
	}
	return ans;
}

Compilation message (stderr)

seats.cpp: In function 'void give_initial_chart(int, int, std::vector<int>, std::vector<int>)':
seats.cpp:44:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |  for (int i = 0; i < R.size(); ++i)
      |                  ~~^~~~~~~~~~
seats.cpp: In function 'int swap_seats(int, int)':
seats.cpp:59:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |  while (crmax<R.size()-1){
      |         ~~~~~^~~~~~~~~~~
seats.cpp:54:6: warning: unused variable 'n' [-Wunused-variable]
   54 |  int n = R.size();
      |      ^

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