Submission #1196481

#	Time	Username	Problem	Language	Result	Execution time	Memory
1196481		tkm_algorithms	Seats (IOI18_seats)	C++17	17 / 100	4094 ms	43908 KiB

seats

/**
*    In the name of Allah
*    We are nothing and you're everything
**/
#include <bits/stdc++.h>
//#include "seats.h"
using namespace std;
using ll = long long;

#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()
//#define int ll

const char nl = '\n';

const int N = 1e6+10;

vector<int> r, c;
vector<int> R_mins, R_maxs;
vector<int> C_mins, C_maxs; 
int h, w, p[N];
int ans;

void upd(int i) {
	R_mins[i] = r[i];
	R_maxs[i] = r[i];
	C_mins[i] = c[i];
	C_maxs[i] = c[i];
	
	if (i > 0) {
		R_mins[i] = min(R_mins[i], R_mins[i-1]);
		R_maxs[i] = max(R_maxs[i], R_maxs[i-1]);
		C_mins[i] = min(C_mins[i], C_mins[i-1]);
		C_maxs[i] = max(C_maxs[i], C_maxs[i-1]);
	}
	
	int calc = (R_maxs[i]-R_mins[i]+1)*(C_maxs[i]-C_mins[i]+1);
	if (calc == i+1) {
		if (p[i] == 0)ans += 1, p[i] = 1;
	} else {
		if (p[i] == 1)ans -= 1, p[i] = 0;
	}
}

void give_initial_chart(int H, int W, std::vector<int> R, std::vector<int> C) {
  r = R, c = C;
  h = H, w = W;
  R_mins.assign(h*w, h*w);
  C_mins.assign(h*w, h*w);
  R_maxs.assign(h*w, 0);
  C_maxs.assign(h*w, 0);
  memset(p, 0, sizeof p);
  
  for (int i = 0; i < h*w; ++i)
	upd(i);
}

int swap_seats(int a, int b) {
	swap(r[a], r[b]);
	swap(c[a], c[b]);
	
	if (a > b)swap(a, b);
	for (int i = a; i <= b; ++i)
		upd(i);
	return ans;
}


//void solve() {
	//int H, W, Q;
	//cin >> H >> W >> Q;
	
	//vector<int> R, C;
	//R.resize(H*W); C.resize(H*W);
	//for (int i = 0; i < H*W; ++i)cin >> R[i] >> C[i];
	
	//give_initial_chart(H, W, R, C);
	
	//while (Q--) {
		//int a, b; cin >> a >> b;
		//cout << swap_seats(a, b) << nl;
	//}
//}

//int32_t main() {
    //ios::sync_with_stdio(0);
    //cin.tie(0);
    //int t = 1;
    //for (int _ = 0; _ < t; ++_) {
        //solve();
    //}
    //return 0;
//}

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