Submission #1120201

#	Time	Username	Problem	Language	Result	Execution time	Memory
1120201		vjudge1	Palindrome-Free Numbers (BOI13_numbers)	C++17	31.67 / 100	1086 ms	512 KiB

numbers

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

#define int long long
#define ld double


const int INF = 1e18;
const int mod = 12345;
const int sz = 1e5 + 5;

bool pal(string z)
{
    string s = z;
    reverse(s.begin() , s.end());
    return z == s;
}

bool f(int x)
{
    string s;
    s = to_string(x);
    for(int i = 0;i < s.size() - 1;i++)
    {
        string c = "";
        c += s[i];
        for(int j = i + 1;j < s.size();j++)
        {
            c += s[j];
            if(c[0] == c[c.size() - 1]){
                    if(pal(c)) return true;
            }
        }
    }
    return false;
}

signed main()
{
   ios_base::sync_with_stdio(0);cin.tie(0);
   int a , b;
   cin >> a >> b;
   int ans = 0;
   for(int i = a;i <= b;i++)
   {
       if(f(i))
       {
           ans++;
       }
   }
   cout << b - a + 1 - ans << endl;
}

Compilation message (stderr)

numbers.cpp: In function 'bool f(long long int)':
numbers.cpp:23:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |     for(int i = 0;i < s.size() - 1;i++)
      |                   ~~^~~~~~~~~~~~~~
numbers.cpp:27:29: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |         for(int j = i + 1;j < s.size();j++)
      |                           ~~^~~~~~~~~~

• Subtask 1: 25 / 25
• Subtask 2: 6.666666666666667 / 75