Submission #739421

#	Time	Username	Problem	Language	Result	Execution time	Memory
739421		onebit1024	Data Transfer (IOI19_transfer)	C++17	60 / 100	3069 ms	2448 KiB

transfer

#include "transfer.h"
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
 
 
 
void __print(int x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");} 
 
template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifndef ONLINE_JUDGE
#define dbg(x...) cerr << "LINE(" << __LINE__ << ") -> " <<"[" << #x << "] = ["; _print(x)
#else
#define dbg(x...)
#endif
 
string bin(int x){
	string res;
	for(int i = 30;i>=0;--i){
		if(x&(1ll<<i))res+='1';
		else res+='0';
	}
	while(!res.empty() && res[0]=='0')res.erase(res.begin());
	return res;
}
int power(int x){
	// is x a power of 2
	while((x%2)==0)x/=2;
	if(x==1)return 1;
	return 0;
}
 
 
std::vector<int> get_attachment(std::vector<int> source) {
	int v = 3;
	int x = 0;
	for(int i = 0;i<source.size();++i){
		while(power(v))v++;
		if(source[i])x^=v;
		v++;
	}
	string s= bin(x);
	vector<int>ret;
	for(auto w : s)ret.pb(w-'0');
	return ret;
}
/*
1
1 110101100
*/
std::vector<int> retrieve(std::vector<int> data) {
	int N = 63;
	if(data.size()>100)N = 255;
 
	int bits = data.size()-N;
	vector<int>ret;

	int v = 3, X = 0, Y = 0;
	for(int i = 0;i<N;++i){
		while(power(v))v++;
		if(data[i])X^=v;
		v++;
	}
	
	int pos = 0;
	for(int i = data.size()-1;i>=N;--i){
		if(data[i])Y+=(1ll<<pos);
		pos++;
	}
	if(X==Y){
		for(int i = 0;i<N;++i)ret.pb(data[i]);
		return ret;
	}
	for(int i = 0;i<N;++i){
 
		int nsum = 0;
		data[i] = 1-data[i];
		v = 3;
		for(int j = 0;j<N;++j){
			while(power(v))v++;

			if(data[j])nsum^=v;
			v++;
		}
		data[i] = 1-data[i];
		if(nsum==Y){
			for(int j = 0;j<i;++j)ret.pb(data[j]);
			ret.pb((data[i]?0:1));
			for(int j = i+1;j<N;++j)ret.pb(data[j]);
			return ret;
		}
		v++;
	}
	for(int i = 0;i<N;++i)ret.pb(data[i]);
	return ret;
}

Compilation message (stderr)

transfer.cpp: In function 'std::vector<int> get_attachment(std::vector<int>)':
transfer.cpp:54:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |  for(int i = 0;i<source.size();++i){
      |                ~^~~~~~~~~~~~~~
transfer.cpp: In function 'std::vector<int> retrieve(std::vector<int>)':
transfer.cpp:72:6: warning: unused variable 'bits' [-Wunused-variable]
   72 |  int bits = data.size()-N;
      |      ^~~~

• Subtask 1: 60 / 60
• Subtask 2: 0 / 40