Submission #810658

#	Time	Username	Problem	Language	Result	Execution time	Memory
810658		CESxRhino	Palindrome-Free Numbers (BOI13_numbers)	C++14	12.08 / 100	1 ms	340 KiB

numbers

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

#define ll long long
#define ull unsigned long long
#define ld long double
#define pb push_back
#define setpre(i) setprecision(i)<<fixed
#define foru(i, a, b) for(int i=a;i<=b;++i)
#define ford(i, a, b) for(int i=a;i>=b;--i)
#define mp make_pair
#define moo cout<<"moo "
#define fi first
#define se second

ll lmod = 1e9 + 7;
typedef vector<int> vi;
typedef vector< vector<int> > vvi;
typedef pair<int, int> ii;
typedef pair<double, double> dd;

ll dp[20][2][2][11][11];
string num;

ll solve(int pos, bool under, bool started, int dig1, int dig2){
    ll &ans = dp[pos][under][started][dig1][dig2];
    if(pos == num.size()){
        if(!started) return 0;
        else return 1;
    }
    if(ans != -1) return ans;
    ans = 0;
    foru(i, 0, 9){
        if(!under and i > num[pos] - '0') break;
        if(i == dig1 or i == dig2) continue;
        if(i) ans += solve(pos + 1, under or i < num[pos] - '0', 1, dig2, i);
        else ans += solve(pos + 1, under or i < num[pos] - '0', started, dig2, -1);
    }
    return ans;
}

ll cnt(int x, int y){
    num = to_string(y);
    memset(dp, -1, sizeof dp);
    ll temp1 = solve(0, 0, 0, 10, 10);
    // cout << temp1 << endl;
    num = to_string(x - 1);
    memset(dp, -1, sizeof dp);
    ll temp2 = solve(0, 0, 0, 10, 10);
    // cout << temp2 << endl;
    return temp1 - temp2;
    
}

int main(){
//    freopen("input.inp", "r", stdin);
//    freopen("output.out", "w", stdout);
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    // cout << cnt(1, 10);
    ll a, b; cin >> a >> b;
    cout << cnt(a, b) << endl;

//    fclose(stdout);
}

Compilation message (stderr)

numbers.cpp: In function 'long long int solve(int, bool, bool, int, int)':
numbers.cpp:27:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |     if(pos == num.size()){
      |        ~~~~^~~~~~~~~~~~~

• Subtask 1: 3.75 / 25
• Subtask 2: 8.333333333333334 / 75