Submission #794855

#	Time	Username	Problem	Language	Result	Execution time	Memory
794855		bane	Martian DNA (IOI16_dna)	C++17	100 / 100	10 ms	372 KiB

dna

        #include <bits/stdc++.h>
        #include "dna.h"
        using namespace std;
         
       
        string analyse(int n, int t) {
             mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
            string ans = "";
            int resp = 0;
            while(ans.size() < n){
                if (19 < resp){
                    break;
                }
                ans += '0' + uniform_int_distribution<int>(0,1)(rng);
                if (make_test(ans)){
                    resp = 0;
                    continue;
                }
                if (ans.back() == '1')ans.back() = '0';
                else ans.back() = '1';

                ++resp;
            }
            int r = ans.size() - 1, l = ans.size() - resp;
            while(l<=r){
                int mid = (l+r) / 2;
                if (make_test(ans.substr(0,mid+1))){
                    l = mid + 1;
                }else{
                    r = mid - 1;
                }
            }
            //iame desna strana
            ans = ans.substr(0,l);
            while(ans.size() != n){
                
                if (make_test('1' + ans))ans = '1' + ans;
                else ans = '0' + ans;
            }
            return ans;
        }                       

Compilation message (stderr)

dna.cpp: In function 'std::string analyse(int, int)':
dna.cpp:10:30: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   10 |             while(ans.size() < n){
      |                   ~~~~~~~~~~~^~~
dna.cpp:35:30: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   35 |             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: 11 / 11
• Subtask 2: 25 / 25
• Subtask 3: 64 / 64