Submission #528327

#	Time	Username	Problem	Language	Result	Execution time	Memory
528327		CherryMagic	Palindrome-Free Numbers (BOI13_numbers)	C++14	0 / 100	1099 ms	2404 KiB

numbers

#include <iostream>
#include <vector>
#include <algorithm>
#include <cstring>

using namespace std;

long a,b;
long dp[25][10][10][2][2][25];
vector<int> num;

long call(int pos, int dig1, int dig2, int notpal, int f, int nz){
    if (pos == num.size()){
        if (notpal) return 1;
        return 0;
    }
    if (dp[pos][dig1][dig2][notpal][f][nz] != -1)
        return dp[pos][dig1][dig2][notpal][f][nz];
    long res = 0;
    int lmt;
    if (f == 0){
        lmt = num[pos];
    }
    else lmt = 9;
    for (int dgt=0;dgt<=lmt;dgt++){
        int ndig1, ndig2, nnotpal=notpal, nf=f, nnz=nz;
        if (f == 0 && dgt < lmt ) nf=1;
        if (nz<=pos) nnz = nz;
        else{
            if (dgt != 0) nnz = pos+1;
            else nnz = 23;
        }
        if ((pos>=3 && dgt==dig2 && pos>=nz)||
            (pos>=4 && dgt==dig1 && pos>=nz+1)) nnotpal=0;
        ndig1 = dig2;
        ndig2 = dgt;

        if (nnotpal) res+= call(pos+1, ndig1, ndig2, nnotpal, nf, nnz);
    }
    return dp[pos][dig1][dig2][notpal][f][nz]= res;
}

long solve(int a){
    num.clear();
    while (a > 0){
        num.push_back(a%10);
        a/=10;
    }
    num.push_back(0);
    num.push_back(0);
    reverse(num.begin(), num.end());
    memset(dp, -1, sizeof(dp));
    return call(2, 0, 0, 1, 0, 23);
}

int main()
{
    int t;
    cin >> t;
    while (t--){
        cin >> a >> b;
        if (a == 0) cout<<solve(b)<<endl;
        else cout << solve(b) - solve(a-1);
    }
    return 0;
}

Compilation message (stderr)

numbers.cpp: In function 'long int call(int, int, int, int, int, int)':
numbers.cpp:13:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |     if (pos == num.size()){
      |         ~~~~^~~~~~~~~~~~~

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