Submission #1120551

#	Time	Username	Problem	Language	Result	Execution time	Memory
1120551		vjudge1	Palindrome-Free Numbers (BOI13_numbers)	C++17	15 / 100	1096 ms	131072 KiB

numbers

#include <bits/stdc++.h>
using namespace std;
unordered_set<int> st;
int lf,rf;
bool da(int a){
    vector<int> sira;
    while(a){
        sira.push_back(a % 10);
        a /= 10;
    }
    int l=0,r=sira.size() - 1;
    while(l < r){
        if(sira[l] != sira[r])return 0;
        l++;
        r--;
    }
    return 1;
}

void qur(int a,int cnt){
    if(a > rf)return;
    if(lf <= a)st.insert(a);
    for(int i=0;i<=9;++i){
        qur(a * 10 + i,cnt+1);
        if(i){
            qur(i * pow(10,cnt) + a,cnt+1);
        }
    }
}


bool check(int a){
    vector<int> sira;
    while(a){
        sira.push_back(a % 10);
        a /= 10;
    }
    for(int i=0;i<sira.size();++i){
        vector<int> temp;
        temp.push_back(sira[i]);
        for(int j=i+1;j<sira.size();++j){
            bool nuhuh = 0;
            temp.push_back(sira[j]);
            int l=0,r= temp.size() - 1;
            while(l <= r){
                if(temp[l] != temp[r]){
                    nuhuh = 1;
                    break;
                }
                l++;
                r--;
            }
            if(nuhuh)continue;
            return 0;
        }
    }
    return 1;
}

signed main(){
    int a,b;
    cin >> a >> b;
    lf = a;
    rf = b;
    int cnt=2;
    for(int i=11;i<=999;++i){
        if(i >= 100)cnt = 3;
        if(da(i) || i % 100 == 0){
            qur(i,cnt);
        }
    }
    cout << rf - lf  + 1 - st.size();

}

Compilation message (stderr)

numbers.cpp: In function 'bool check(int)':
numbers.cpp:38:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |     for(int i=0;i<sira.size();++i){
      |                 ~^~~~~~~~~~~~
numbers.cpp:41:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |         for(int j=i+1;j<sira.size();++j){
      |                       ~^~~~~~~~~~~~

• Subtask 1: 15 / 25
• Subtask 2: 0 / 75