Submission #593273

#	Time	Username	Problem	Language	Result	Execution time	Memory
593273		ignaciocanta	Martian DNA (IOI16_dna)	C++14	100 / 100	13 ms	388 KiB

dna

#include "dna.h"

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

#define SZ(v) int((v).size())
#define F0R(i, a) for(int i = (0); i < int(a); ++i)

string analyse(int n, int t) {
	int low = 0, high = n+1;
	while(high - low > 1) {
		int mid = low + (high - low) / 2;
		if(make_test(string(mid, '0'))) low = mid;
		else high = mid;
	}
	int maxZeros = low;
	if(maxZeros == 0) {
		return string(n, '1');
	}
	string curRet = string(maxZeros, '0');
	int curZeroLen = 0;
	while(SZ(curRet) < n && curZeroLen <= maxZeros){
		if(make_test(curRet + string(curZeroLen, '0') + '1')) {
			curRet += string(curZeroLen, '0') + '1';
			curZeroLen = 0;
		} else {
			++curZeroLen;
		}
	}
	low = 0, high = min(n - SZ(curRet), curZeroLen) + 1;
	while(high - low > 1) {
		int mid = low + (high - low) / 2;
		if(make_test(curRet + string(mid, '0'))) low = mid;
		else high = mid;
	}
	curRet += string(low, '0');
	int len = SZ(curRet);
	F0R(i, n - len){
		if(make_test('1' + curRet)) curRet = '1' + curRet;
		else curRet = '0' + curRet;
	}
	return curRet;
}      

Compilation message (stderr)

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