Submission #497290

#	Time	Username	Problem	Language	Result	Execution time	Memory
497290		MilosMilutinovic	Martian DNA (IOI16_dna)	C++14	100 / 100	12 ms	396 KiB

dna

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

using ll = long long;
using ld = long double;

bool make_test(string s);

string analyse(int n, int t){
	if(!make_test("0"))return string(n, '1');
	string ans = "";
	int l = 1, r = n, len;
	while(l <= r){
		int mid = (l+r)/2;
		if(make_test(string(mid, '0'))){
			len = mid;
			l = mid + 1;
		} else r = mid - 1;
	}
	ans = string(len, '0');
	int cnt = 0;
	while(ans.size()<n && cnt<=len){
		if(make_test(ans + '1')){
			ans += '1';
			cnt = 0;
		}
		else {
			ans += '0';
			cnt++;
		}
	}
	l = 1, r = ans.size();
	string ns;
	while(l <= r){
		int mid = (l+r)/2;
		string q = "";
		for(int i=0; i<mid; i++)q += ans[i];
		if(make_test(q)){
			l = mid + 1;
			ns = q;
		}
		else r = mid - 1;
	}
	ans = ns;
	while(ans.size()<n){
		if(make_test('0' + ans))ans = '0' + ans;
		else ans = '1' + ans;
	}
	return ans;
}

Compilation message (stderr)

dna.cpp: In function 'std::string analyse(int, int)':
dna.cpp:22:18: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   22 |  while(ans.size()<n && cnt<=len){
      |        ~~~~~~~~~~^~
dna.cpp:45:18: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   45 |  while(ans.size()<n){
      |        ~~~~~~~~~~^~
dna.cpp:22:21: warning: 'len' may be used uninitialized in this function [-Wmaybe-uninitialized]
   22 |  while(ans.size()<n && cnt<=len){
      |        ~~~~~~~~~~~~~^~~~~~~~~~~
grader.cpp: In function 'bool make_test(std::string)':
grader.cpp:14:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |  for (int i = 0; i < p.size(); i++) {
      |                  ~~^~~~~~~~~~
grader.cpp:23:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |  for (int i = 1; i <= ss.size(); i++) {
      |                  ~~^~~~~~~~~~~~
grader.cpp:28:13: warning: comparison of integer expressions of different signedness: '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'} and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |   if (pr[i] == p.size()) {

• Subtask 1: 11 / 11
• Subtask 2: 25 / 25
• Subtask 3: 64 / 64