Submission #335531

#	Time	Username	Problem	Language	Result	Execution time	Memory
335531		ainta	Martian DNA (IOI16_dna)	C++17	100 / 100	16 ms	492 KiB

dna

#include "dna.h"

#include <cstdlib>
#include <string>
using namespace std;

std::string analyse(int n, int t) {
    int b = 1, e = n, r = 0;
    int i, j;
    while(b<=e){
        int mid = (b+e)>>1;
        string s = "";
        for(i=0;i<mid;i++)s+='0';
        if(make_test(s)){
            r=mid;
            b=mid+1;
        }
        else e=mid-1;
    }
    string s = "";
    for(i=0;i<r;i++)s+='0';
    int ck=0;
    for(i=0;;i++){
        s+='1';
        if(make_test(s))ck=0;
        else{
            s.pop_back();
            s+='0';
            ck++;
        }
        if(ck>r){
            for(j=0;j<ck;j++)s.pop_back();
            for(j=0;j<ck;j++){
                s+='0';
                if(!make_test(s)){
                    s.pop_back();
                    break;
                }
            }
            break;
        }
    }
    while(s.size()<n){
        string t1 = "0"+s;
        if(make_test(t1))s = t1;
        else s = "1"+s;
    }
    return s;
}

Compilation message (stderr)

dna.cpp: In function 'std::string analyse(int, int)':
dna.cpp:43:19: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   43 |     while(s.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