Submission #742810

#	Time	Username	Problem	Language	Result	Execution time	Memory
742810		nguyentunglam	Martian DNA (IOI16_dna)	C++17	100 / 100	12 ms	468 KiB

dna

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

std::string analyse(int n, int t) {
    string cur;
    int l = 1, r = n, len = 0;
    while (l <= r) {
        int mid = l + r >> 1;
        string ask;
        for(int i = 1; i <= mid; i++) ask.push_back('0');
        if (make_test(ask)) {
            len = mid;
            l = mid + 1;
        }
        else r = mid - 1;
    }
    for(int i = 1; i <= len; i++) cur.push_back('0');
    int wrong = 0;
    while (cur.size() < n && wrong <= len) {
        if (make_test(cur + '1')) {
            wrong = 0;
            cur = cur + '1';
        }
        else {
            wrong++;
            cur = cur + '0';
        }
    }
    while (wrong--) cur.pop_back();
    while (make_test(cur + '0')) cur = cur + '0';
    while (cur.size() < n) {
        if (make_test('1' + cur)) cur = '1' + cur;
        else cur = '0' + cur;
    }
    return cur;
}

Compilation message (stderr)

dna.cpp: In function 'std::string analyse(int, int)':
dna.cpp:10:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   10 |         int mid = l + r >> 1;
      |                   ~~^~~
dna.cpp:21:23: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   21 |     while (cur.size() < n && wrong <= len) {
      |            ~~~~~~~~~~~^~~
dna.cpp:33:23: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   33 |     while (cur.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: 11 / 11
• Subtask 2: 25 / 25
• Subtask 3: 64 / 64