Submission #965569

#	Time	Username	Problem	Language	Result	Execution time	Memory
965569		AdamGS	Martian DNA (IOI16_dna)	C++17	100 / 100	9 ms	600 KiB

dna

#include "dna.h"
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(a, b) for(int a = 0; a < (b); ++a)
#define st first
#define nd second
#define pb push_back
#define all(a) a.begin(), a.end()
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
int los(int a, int b) {
  return rng()%(b-a+1)+a;
}
string analyse(int n, int t) {
  string ans="";
  int akt=0;
  while(true) {
    char a=los('0', '1');
    ++akt;
    if(make_test(ans+a)) {
      ans+=a;
      akt=0;
    } else {
      if(a=='0') ans+="1"; else ans+="0";
    }
    if(akt<16) continue;
    if(make_test(ans)) {
      akt=0;
      continue;
    }
    int po=1, ko=16;
    while(po<ko) {
      int sr=(po+ko)/2;
      string s=ans;
      rep(i, sr) s.pop_back();
      if(make_test(s)) ko=sr; else po=sr+1;
    }
    rep(i, po) ans.pop_back();
    break;
  }
  while(ans.size()<n) {
    if(make_test("0"+ans)) ans="0"+ans; else ans="1"+ans;
  }
  return ans;
}

Compilation message (stderr)

dna.cpp: In function 'std::string analyse(int, int)':
dna.cpp:41:19: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   41 |   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