Submission #1120223

#	Time	Username	Problem	Language	Result	Execution time	Memory
1120223		vjudge1	Palindrome-Free Numbers (BOI13_numbers)	C++17	20 / 100	1100 ms	788 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)
{
    int x = stoi(z);
    int xc = x;
    int cur = 1;
    int res = 0;
    while(xc > 0)
    {
        res += (cur * (xc % 10));
        cur *= 10;
        xc /= 10;
    }
    return res == x;
}

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] && c[1] == c[c.size() - 2]){
                    if(pal(c)) return false;
            }
        }
    }
    return true;
}

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 << ans  << endl;
}

Compilation message (stderr)

numbers.cpp: In function 'bool f(long long int)':
numbers.cpp:31:21: 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]
   31 |     for(int i = 0;i < s.size() - 1;i++)
      |                   ~~^~~~~~~~~~~~~~
numbers.cpp:35:29: 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]
   35 |         for(int j = i + 1;j < s.size();j++)
      |                           ~~^~~~~~~~~~

• Subtask 1: 20 / 25
• Subtask 2: 0 / 75