Submission #300966

#	Time	Username	Problem	Language	Result	Execution time	Memory
300966		TMJN	Mechanical Doll (IOI18_doll)	C++17	0 / 100	275 ms	262148 KiB

doll

#include "doll.h"
#include <bits/stdc++.h>
using namespace std;

static int c;
static vector<int>K;
static vector<int>X,Y,C;

int dfs(int num,int dep){
	if(num+(1<<dep)>=K.size()){
		return K[num];
	}
	else{
		int t=c;
		c++;
		X[t]=dfs(num,dep+1);
		Y[t]=dfs(num+(1<<dep),dep+1);
		return -t-1;
	}
}

void create_circuit(int M,vector<int>A){
	c=0;
	K=A;
	X=Y=vector<int>(400000,0);
	C=vector<int>(M+1,0);
	for(int i=0;;i++){
		if(K.size()<(1<<i)){
			while(K.size()<(1<<i)){
				K.push_back(-c-1);
				c++;
			}
			c--;
			K.back()=0;
		}
	}
	int cc=c;
	int tt=dfs(0,0);
	C=vector<int>(M+1,tt);
	for(int i=0;i<=cc;i++){
		X[i]=-i-1;
		Y[i]=tt;
	}
	vector<bool>B(400000,false);
	int p=0;
	vector<int>T;
	do{
		if(p>=0){
			if(p)T.push_back(p);
			p=C[p];
		}
		else{
			if(B[-p-1]){
				p=Y[-p-1];
			}
			else{
				p=X[-p-1];
			}
			B[-p-1]=!B[-p-1];
		}
	}while(p);
	assert(A==T);
	bool f=false;
	for(int i=0;i<400000;i++){
		f|=B[i];
	}
	assert(!f);
	answer(C,X,Y);
}

Compilation message (stderr)

doll.cpp: In function 'int dfs(int, int)':
doll.cpp:10:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |  if(num+(1<<dep)>=K.size()){
      |     ~~~~~~~~~~~~^~~~~~~~~~
doll.cpp: In function 'void create_circuit(int, std::vector<int>)':
doll.cpp:28:14: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   28 |   if(K.size()<(1<<i)){
      |      ~~~~~~~~^~~~~~~
doll.cpp:29:18: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   29 |    while(K.size()<(1<<i)){
      |          ~~~~~~~~^~~~~~~

• Subtask 1: 0 / 2
• Subtask 2: 0 / 4
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 18
• Subtask 6: 0 / 56