Submission #1224422

#	Time	Username	Problem	Language	Result	Execution time	Memory
1224422		ByeWorld	Finding Routers (IOI20_routers)	C++20	0 / 100	0 ms	320 KiB

routers

#include "routers.h"
#include <bits/stdc++.h>
#define ll long long
#define se second
#define fi first
#define pb push_back
#define lf (id<<1)
#define rg ((id<<1)|1)
#define md ((l+r)>>1)
using namespace std;

int n, ma;
int a[1010];
void solve(int le, int ri){
	if(le > ri) return;
	int i = (le+ri)>>1;

	int l = 0, r = ma;
	for(int j=i-1; j>=1; j--){
		if(a[j] != -1){ l = a[j]; break; }
	}
	for(int j=i+1; j<=n-1; j++){
		if(a[j] != -1){ r = a[j]; break; }
	}
	l++; 
	int p = l, q = r;
	int mid=0, LE=0;
	while(l<=r){
		mid = md;
		if(use_detector(mid) == i) r = mid-1, LE = mid;
		else l = mid+1;
	}
	l = p; r = q; int RI = 0;
	while(l<=r){
		mid = md;
		if(use_detector(mid) == i) l = mid+1, RI = mid;
		else r = mid-1;
	}
	// cout << cnt << " cnt\n";
	LE++;
	a[i] = (LE+RI)/2;
	solve(le, i-1); solve(i+1, ri);
}
std::vector<int> find_routers(int MA, int N, int q) {
	n = N; ma = MA;
	for(int i=1; i<=n-1; i++) a[i] = -1;
	solve(1, n-1);
	vector<int> ans; ans.pb(0);
	for(int i=1; i<=n-1; i++) ans.pb(a[i]);
	// for(auto in : ans) cout << in << " in\n";
	return ans;
}

• Subtask 1: 0 / 16
• Subtask 2: 0 / 21
• Subtask 3: 0 / 23
• Subtask 4: 0 / 40