Submission #206684

#	Time	Username	Problem	Language	Result	Execution time	Memory
206684		bash	"The Lyuboyn" code (IZhO19_lyuboyn)	C++17	100 / 100	97 ms	44636 KiB

lyuboyn

#include <bits/stdc++.h>
 
#define ll long long
 
using namespace std;          
 
int n, k, t;
vector <int> tran;
 
int val(string &s) {
	int res = 0;
	for (int i = 0; i < s.size(); i++) {
		res += ((s[i] - '0') << i);
	}
	return res;
}
 
string rev(int x) {
	string res;
	for (int i = 0; i < n; i++) {
		res += (x % 2 + '0');
		x /= 2;
	}
	return res;
}
 
int used[1 << 18];
int cnt = 0;
vector <int> vec;
 
int com(string a, string b) {
	int res = 0;
	for (int i = 0; i < a.size(); i++) {
		res += (a[i] != b[i]);
	}
	return res;
}
 
void go(int x) {
	used[x] = 1;
	cnt++;
	vec.push_back(x);
	if (cnt == (1 << n)) {
		if (t == 0 || (com(rev(vec[0]), rev(vec.back())) == k)) {
			cout << vec.size() << endl;
			for (int to : vec) {
				cout << rev(to) << '\n';
			}
			exit(0);
		}
	} else {
		for (int to : tran) {
			if (!used[x ^ to]) {
				go(x ^ to);
			}
		}
	}
	vec.pop_back();
	used[x] = 0;
}
 
main() {
	scanf("%d %d %d", &n, &k, &t);
	if (k % 2 == 0) {
		puts("-1");
		return 0;
	}
	for (int i = 0; i < (1 << n); i++) {
		if (__builtin_popcount(i) == k) {
			tran.push_back(i);
		}
	}
	string s; cin >> s;
	int x = val(s);
	go(x);
}

Compilation message (stderr)

lyuboyn.cpp: In function 'int val(std::__cxx11::string&)':
lyuboyn.cpp:12:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < s.size(); i++) {
                  ~~^~~~~~~~~~
lyuboyn.cpp: In function 'int com(std::__cxx11::string, std::__cxx11::string)':
lyuboyn.cpp:33:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < a.size(); i++) {
                  ~~^~~~~~~~~~
lyuboyn.cpp: At global scope:
lyuboyn.cpp:62:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main() {
      ^
lyuboyn.cpp: In function 'int main()':
lyuboyn.cpp:63:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %d", &n, &k, &t);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 0
• Subtask 2: 5 / 5
• Subtask 3: 3 / 3
• Subtask 4: 11 / 11
• Subtask 5: 15 / 15
• Subtask 6: 18 / 18
• Subtask 7: 31 / 31
• Subtask 8: 17 / 17