Submission #557816

#	Time	Username	Problem	Language	Result	Execution time	Memory
557816		Jomnoi	Martian DNA (IOI16_dna)	C++17	100 / 100	31 ms	384 KiB

dna

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

int l, r, mid, len;
string str;

string analyse(int n, int t) {
    if(make_test("0") == false) {
        while(n--) {
            str += '1';
        }
        return str;
    }
    
    for(int i = 0; i < n; i++) {
        str += '0';
    }

    l = 1, r = n;
    while(l <= r) {
        mid = (l + r) / 2;

        if(make_test(str.substr(0, mid)) == true) {
            l = mid + 1;
            len = mid;
        }
        else {
            r = mid - 1;
        }
    }

    str = str.substr(0, len);
    for(int i = 0; i <= len;) {
        if(make_test(str + '1') == true) {
            str += '1';
            i = 0;
        }
        else {
            str += '0';
            i++;
        }
    }

    l = 1, r = str.length();
    while(l <= r) {
        mid = (l + r) / 2;

        if(make_test(str.substr(0, mid)) == true) {
            l = mid + 1;
            len = mid;
        }
        else {
            r = mid - 1;
        }
    }

    str = str.substr(0, len);
    while(str.size() < n) {
        if(make_test('1' + str)) {
            str = '1' + str;
        }
        else {
            str = '0' + str;
        }
    }
    return str;
}                       

Compilation message (stderr)

dna.cpp: In function 'std::string analyse(int, int)':
dna.cpp:59:22: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   59 |     while(str.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