Submission #102699

#	Time	Username	Problem	Language	Result	Execution time	Memory
102699		bert30702	Mechanical Doll (IOI18_doll)	C++17	100 / 100	168 ms	10640 KiB

doll

#include <bits/stdc++.h>
#include "doll.h"
using namespace std;
const int MX = 4e5 + 100;
int c[MX], x[MX], y[MX];
bool GG[MX];
int ptr;
int build(vector<int> v) {
	if(*max_element(v.begin(), v.end()) == 
	   *min_element(v.begin(), v.end())) return v[0];
	vector<int> a, b;
	int p = --ptr;
	for(int i = 0; i < v.size(); i ++) {
		if(i & 1) b.push_back(v[i]);
		else      a.push_back(v[i]);
	}
	x[-p] = build(a);
	y[-p] = build(b);
	return p;
}
void create_circuit(int	n, vector<int> v) {
	int ttt = v.size();
	c[0] = v[0];
	int k = 1 << __lg(v.size() * 2 - 1);
	int need = k - v.size();
	auto f = [&](int v) {
		int pp = 0;
		for(int j = 0; j < __lg(k); j ++) {
			if(v & (1 << j)) pp += 1 << (__lg(k) - j - 1);
		}
		return pp;
	};
	vector<int> tmp(k, 0);
	v.push_back(0);
	for(int i = 0; i < need; i ++) tmp[f(i)] = -1;
	for(int i = k - 1; i >= 0; i --) {
		if(!tmp[i]) tmp[i] = v.back(), v.pop_back();
	}
	int t = build(tmp);
	for(int i = 1; i <= n; i ++) c[i] = -1;
	for(int i = 1; i <= -ptr + 1; i ++) {
		if(x[i] == -1) x[i] = t;
		if(y[i] == -1) y[i] = t; 
	}
	for(int i = 0; i <= n; i ++) {
		if(c[i] == -1) c[i] = t;
	}
	answer(
		vector<int>(c, c + 1 + n),
		vector<int>(x + 1, x + 1 -ptr),
		vector<int>(y + 1, y + 1 -ptr)
	);
}

Compilation message (stderr)

doll.cpp: In function 'int build(std::vector<int>)':
doll.cpp:13:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |  for(int i = 0; i < v.size(); i ++) {
      |                 ~~^~~~~~~~~~
doll.cpp: In function 'void create_circuit(int, std::vector<int>)':
doll.cpp:22:6: warning: unused variable 'ttt' [-Wunused-variable]
   22 |  int ttt = v.size();
      |      ^~~

• Subtask 1: 2 / 2
• Subtask 2: 4 / 4
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 18 / 18
• Subtask 6: 56 / 56