제출 #406592

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
406592		iulia13	Palindrome-Free Numbers (BOI13_numbers)	C++14	93.75 / 100	2 ms	352 KiB

numbers

#include <bits/stdc++.h>

using namespace std;
#define ll long long
ll dp[10][10][20][2]; ///cifrele i, j; lungime k; am voie sau nu cifra
string s;
ll calc(int fst, int sec, int n, int da)
{
    int i, j;
    if (n >= s.size())
        return 1;
    if (dp[fst][sec][n][da] != -1)
        return dp[fst][sec][n][da];
    ll rez = 0;
    if (da)
    {
        for (i = 0; i < 10; i++)
            if (i != fst && i != sec)
                rez += calc(sec, i, n + 1, 1);
    }
    else
    {
        for (i = 0; i < s[n] - '0'; i++)
            if (i != fst && i != sec)
                rez += calc(sec, i, n + 1, 1);
        if (s[n] - '0' != fst && s[n] - '0' != sec)
            rez += calc(sec, s[n] - '0', n + 1, 0);
    }
    dp[fst][sec][n][da] = rez;
    return rez;
}
ll ans(ll nr)
{
    int i,j;
    s.clear();
    if (nr < 0)
        return 0;
    if (nr == 0)
        return 1;
    memset(dp, -1, sizeof(dp));
    while (nr)
    {
        s = s + char('0' + nr % 10);
        nr /= 10;
    }
    reverse(s.begin(), s.end());
    ll a = 0;
    for (i = 1; i < s[0] - '0'; i++)
        a += calc(i, i, 1, 1);
    a += calc(s[0] - '0', s[0] - '0', 1, 0);
    for (i = 2; i <= s.size(); i++)
        for (j = 1; j <= 9; j++)
            a += calc(j, j, i, 1);
    return a;
}
int main()
{
    ll a, b;
    cin >> a >> b;
    cout << ans(b) - ans(a - 1);
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

numbers.cpp: In function 'long long int calc(int, int, int, int)':
numbers.cpp:10:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |     if (n >= s.size())
      |         ~~^~~~~~~~~~~
numbers.cpp:9:12: warning: unused variable 'j' [-Wunused-variable]
    9 |     int i, j;
      |            ^
numbers.cpp: In function 'long long int ans(long long int)':
numbers.cpp:51:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |     for (i = 2; i <= s.size(); i++)
      |                 ~~^~~~~~~~~~~

• Subtask 1: 18.75 / 25
• Subtask 2: 75 / 75