Submission #521399

#	Time	Username	Problem	Language	Result	Execution time	Memory
521399		krit3379	Martian DNA (IOI16_dna)	C++14	0 / 100	12 ms	380 KiB

dna

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

string analyse(int n, int t){
    int i,len,l,r,mid,cnt;
    string s;
    if(!make_test("0")){
        for(i=0;i<n;i++)s.push_back('1');
        return s;
    }
    for(i=0;i<n;i++)s.push_back('0');
    l=1,r=n;
    while(l<=r){
        mid=(l+r)/2;
        if(make_test(s.substr(0,mid)))len=mid,l=mid+1;
        else r=mid-1;
    }
    s=s.substr(0,len);
    for(cnt=0;cnt<=len;cnt++){
        if(make_test(s+"1")){
            s.push_back('1');
            cnt=0;
        }
        else{
            s.push_back('0');
            cnt++;
        }
    }
    l=1,r=s.length();
    while(l<=r){
        mid=(l+r)/2;
        if(make_test(s.substr(0,mid)))len=mid,l=mid+1;
        else r=mid-1;
    }
    while(s.length()<n){
        if(make_test("1"+s))s="1"+s;
        else s="0"+s;
    }
    return s;
}

Compilation message (stderr)

dna.cpp: In function 'std::string analyse(int, int)':
dna.cpp:36:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   36 |     while(s.length()<n){
      |           ~~~~~~~~~~^~
dna.cpp:20:18: warning: 'len' may be used uninitialized in this function [-Wmaybe-uninitialized]
   20 |     for(cnt=0;cnt<=len;cnt++){
      |               ~~~^~~~~
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: 0 / 11
• Subtask 2: 0 / 25
• Subtask 3: 0 / 64