Submission #1108805

#	Time	Username	Problem	Language	Result	Execution time	Memory
1108805		hgmhc	Coreputer (IOI23_coreputer)	C++17	90 / 100	2 ms	508 KiB

coreputer

#include <bits/stdc++.h>
#include "coreputer.h"
using namespace std;
using ll = long long;

ll qcnt;

ll ask(ll x) {
	static int ready[16]{}, cache[16]{};
	
	if (ready[x]) return cache[x];
	ready[x] = true;
	
	vector<int> v;
	for(ll i=0; i<=x; ++i) {
		v.push_back(i);
	}
	++qcnt;
	return cache[x] = run_diagnostic(v);
}

ll ASK(vector<int> v) {
	vector<int> r;
	
	for(ll i=0; i<16; ++i) {
		if (v[i])
			r.push_back(i);
	}
	++qcnt;
	return run_diagnostic(r);
}

vector<int> malfunctioning_cores(int n) {
	ll a=0, b=n-1, z;
	while (a<=b) {
		z=(a+b)/2;
		if (ask(z)<0) a=z+1;
		else b=z-1;
	}
	assert(b<n-1);
	// cerr<<qcnt<<endl;
	// ask(b)<0
	// ask(b+1)>=0
	// ask(b+1)은 0일 수도, 1일 수도 있음
	ll c = 0;
	if (c == b+1) c++;
	
	vector<int> answer(n);
	if (ask(b+1) == 0)
	{
		vector<int> v(16);
		fill(begin(v),begin(v)+b+2,1);
		
		//   b+1  b+2
		// [....][....]
		//    n    n
		answer[b+1] = 1;
		
		for(ll i=0; i<n; ++i) if (i!=b+1 && i!=c) {
			v[i]^=1;
			
			ll r=ASK(v);
			if (r==1) {
				if (i>b+1) answer[i]=1;
				else assert(0);
			}
			else if (r==-1) {
				if (i<=b+1) answer[i]=1;
				else assert(0);
			}
			else {
				answer[i]=0;
			}
			
			v[i]^=1;
		}
		
		if (accumulate(begin(answer),end(answer),0ll)%2 == 1) {
			answer[c] = 1;
		}
	}
	else if (ask(b+1) == 1)
	{
		answer[b+1] = 1;
		
		vector<int> v(16);
		fill(begin(v),begin(v)+b+2,1);
		
		for(ll i=0; i<=b; ++i) if (i!=c) {
			v[i]^=1;
			
			ll r = ASK(v);
			if (r==1) answer[i]=0;
			else if (r==-1) answer[i]=1;
			else assert(0);
			
			v[i]^=1;
		}
		
		if (b+2<n) {
			//     b b+1 b+2
			// [....][1][....]
			//    n       n
			fill(begin(v),begin(v)+b+1,0);
			fill(begin(v)+b+1,begin(v)+n,1);
			
			for(ll i=b+2; i<n; ++i) if (i!=c) {
				v[i]^=1;
				
				ll r = ASK(v);
				if (r==1) answer[i]=0;
				else if (r==-1) answer[i]=1;
				else assert(0);
				
				v[i]^=1;
			}
		}
		
		if (accumulate(begin(answer),end(answer),0ll)%2 == 0) {
			answer[c] = 1;
		}
	} else {
		assert(0);
	}
	
	return answer;
}

• Subtask 1: 20 / 20
• Subtask 2: 40 / 40
• Subtask 3: 30 / 40