Submission #1126028

#	Time	Username	Problem	Language	Result	Execution time	Memory
1126028		KasymK	Palindrome-Free Numbers (BOI13_numbers)	C++20	100 / 100	1 ms	328 KiB

numbers

#include "bits/stdc++.h"
using namespace std;
#define ff first
#define ss second
#define all(v) v.begin(), v.end()
#define ll long long
#define pb push_back
#define pii pair<int, int>
#define pli pair<ll, int>
#define pll pair<ll, ll>
#define tr(i, c) for(auto i = c.begin(); i != c.end(); ++i)
#define wr puts("----------------")
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}

ll dp[19][2][10][10][3];
vector<int> dig;

ll f(int x, int ok, int ld, int pld, int ds){
    if(x==19)
        return 1;
    ll &mal = dp[x][ok][ld][pld][ds];
    if(~mal)
        return mal;
    ll answer = 0;
    for(int i = 0; i < 10; ++i){
        if(!ok and i>dig[x])
            continue;
        if(ds>=1 and i==ld)
            continue;
        if(ds==2 and i==pld)
            continue;
        answer += f(x+1, ok|(i<dig[x]), i, ld, min(2, ds+(ds|(i!=0))));
    }
    return mal=answer;
}

ll plz(ll x){
    if(x<0)
        return 0;
    dig.clear();
    while(x)
        dig.pb(x%10), x/=10;
    while((int)dig.size()!=19)
        dig.pb(0);
    reverse(all(dig));
    memset(dp, -1, sizeof dp);
    return f(0, 0, 0, 0, 0);
}

int main(){
    ll l, r;
    scanf("%lld %lld", &l, &r);
    ll answer = plz(r)-plz(l-1);
    printf("%lld\n", answer);
    return 0;
}

Compilation message (stderr)

numbers.cpp: In function 'int main()':
numbers.cpp:53:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   53 |     scanf("%lld %lld", &l, &r);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~

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