Submission #433421

#	Time	Username	Problem	Language	Result	Execution time	Memory
433421		Kanaifu	Martian DNA (IOI16_dna)	C++14	100 / 100	12 ms	392 KiB

dna

#include <bits/stdc++.h>
#include "dna.h"
#include <cstdlib>
//#include "grader.cpp"

using namespace std;

mt19937 randseed(time(nullptr));

std::string analyse(int n, int t)
{
    bool suff = false;
    int last = 0;
    string sub = "";
    string las = "";
    int calls = 0;
    while ((int)las.size()<n)
    {
        //cout<<las<<" "<<sub<<"\n";
        if (suff)
        {
            sub = "0" + sub;
            if (!make_test(sub))
            {
                sub[0] = '1';
            }
            las = sub;
            continue;
        }
        int koristi =  randseed() % 2;
        if (koristi)
        {
            sub += "1";
            if (make_test(sub))
            {
                las = sub;
                last = 0;
            }
            else
            {
                sub.back()= '0';
                last++;
                if (last>6)
                {
                    int ind = las.size();
                    if (make_test(las+sub[ind]))
                    {
                        las+=sub[ind];
                        last--;
                        continue;
                    }
                    suff=true;
                    sub = las;
                    continue;
                }
            }
        }
        else
        {
            sub += "0";
            if (make_test(sub))
            {
                las = sub;
                last = 0;
            }
            else
            {
                sub.back() = '1';
                last++;
                if (last>6)
                {
                    int ind = las.size();
                    if (make_test(las+sub[ind]))
                    {
                        las+=sub[ind];
                        last--;
                        continue;
                    }
                    suff=true;
                    sub = las;
                    continue;
                }
            }
        }
        //cout<<las<<" ";
    }
    return las;
}

Compilation message (stderr)

dna.cpp: In function 'std::string analyse(int, int)':
dna.cpp:16:9: warning: unused variable 'calls' [-Wunused-variable]
   16 |     int calls = 0;
      |         ^~~~~
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