Submission #800955

#	Time	Username	Problem	Language	Result	Execution time	Memory
800955		LIF	Martian DNA (IOI16_dna)	C++14	0 / 100	10 ms	396 KiB

dna

#include "dna.h"
#include<bits/stdc++.h>
#include <cstdlib>
using namespace std;
std::string analyse(int n, int t) {
    int l = 1;
    int r = n;
    int len = 0;
    while(l<=r)
    {
    	int mid = (l+r)>>1;
    	string temp;
    	for(int i=1;i<=mid;i++)temp += "0";
    	if(make_test(temp) == true)
    	{
    		l = mid+1;
    		len = mid;
		}
		else r = mid-1;
	}
	string ans;
	for(int i=1;i<=len;i++)ans += "0";
	int now = 0;
	while(now <= len && ans.size() < n)
	{
		ans += "1";
		if(make_test(ans) == true)
		{
			now = 0;
		}
		else
		{
			now++;
			ans.erase(ans.size()-1);
			ans += "0";
		}
	}
	if(make_test(ans) == true)return ans;
	while(now--)ans.erase(ans.size()-1);
//	cout<<ans<<endl;
	while(ans.size() < n)
	{
		ans = "1" + ans;
		if(make_test(ans) == false)
		{
			ans.erase(0,1);
			ans = "0" + ans;
		}
		//cout<<ans<<endl;
	}
    return ans;
}                       

Compilation message (stderr)

dna.cpp: In function 'std::string analyse(int, int)':
dna.cpp:24:33: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   24 |  while(now <= len && ans.size() < n)
      |                      ~~~~~~~~~~~^~~
dna.cpp:41:19: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   41 |  while(ans.size() < n)
      |        ~~~~~~~~~~~^~~
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: 0 / 11
• Subtask 2: 0 / 25
• Subtask 3: 0 / 64