Submission #561908

#	Time	Username	Problem	Language	Result	Execution time	Memory
561908		tj14	Martian DNA (IOI16_dna)	C++14	0 / 100	15 ms	396 KiB

dna

#include "dna.h"

#include <bits/stdc++.h>

using namespace std;

string get_repeat_char(string x, int rep) {
  string s = "";
  for (int i = 0; i < rep; i++)
    s += x;
  return s;
}

string analyse(int n, int t) {
  int l = 1, r = n;
  while (l <= r) {
    int m = (l + r) / 2;
    if (make_test(get_repeat_char("0", m)))
      l = m + 1;
    else
      r = m - 1;
  }
  int longest_zeros = r;
  int c = 0;
  string primer = get_repeat_char("0", longest_zeros);
  string almost_suffix;
  while (c < longest_zeros) {
    if (make_test(primer + "1")) {
      primer += "1";
      almost_suffix = primer;
      c = 0;
    } else {
      primer += "0";
      c++;
    }
  }
  l = 1, r = c;
  while (l <= r) {
    int m = (l + r) / 2;
    if (make_test(almost_suffix + get_repeat_char("0", m)))
      l = m + 1;
    else
      r = m - 1;
  }
  string suffix = almost_suffix + get_repeat_char("0", r);
  while (suffix.length() <= n) {
    if (make_test("1" + suffix))
      suffix = "1" + suffix;
    else
      suffix = "0" + suffix;
  }
  return suffix;
}

Compilation message (stderr)

dna.cpp: In function 'std::string analyse(int, int)':
dna.cpp:46:26: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   46 |   while (suffix.length() <= 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