Submission #1198718

#	Time	Username	Problem	Language	Result	Execution time	Memory
1198718		nvc2k8	Palindrome-Free Numbers (BOI13_numbers)	C++20	100 / 100	0 ms	328 KiB

numbers

#include <bits/stdc++.h>
#define TASK "numbers"
#define INT_LIM (int) 2147483647
#define LL_LIM (long long) 9223372036854775807
#define endl '\n'
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define BIT(i,x) (((i)>>(x))&1)
#define FOR(i,a,b) for(int i = (a); i<=(b); i++)
#define FORD(i,a,b) for(int i = (a); i>=(b); i--)
#define ll long long
#define pii pair<int,int>
using namespace std;
///------------------------------------------///
string a,b;

void inp()
{
    cin >> a >> b;
    while(a.size()<19) a = '0'+a;
    while(b.size()<19) b = '0'+b;
}

ll dp[19][2][2][11][11];

void add(ll &x, const ll &y)
{
    x+=y;
}

ll calc(int i, int okl, int okr, int la1, int la2)
{
    if (i==19) return 1;
    ll &ret = dp[i][okl][okr][la1][la2];
    if (ret!=-1) return ret;

    ret = 0;
    int dl = ((okl)?0:a[i]-'0');
    int dh = ((okr)?9:b[i]-'0');

    FOR(d, dl, dh) if (d!=la1 && d!=la2)
    {
        int nd = d;
        if (la1==10 && la2==10 && d==0) nd = 10;
        add(ret, calc(i+1, okl|(d>a[i]-'0'), okr|(d<b[i]-'0'), nd, la1));
    }

    return ret;
}

void solve()
{
    memset(dp, -1, sizeof dp);
    cout << calc(0, 0, 0, 10, 10);
}

signed main()
{
    ///--------------------------///
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    if (fopen(TASK".INP","r")!=NULL)
    {
        freopen(TASK".INP","r",stdin);
        freopen(TASK".OUT","w",stdout);
    }
    ///--------------------------///

    int NTEST = 1;
    //cin >> NTEST;

    while (NTEST--)
    {
        inp();
        solve();
    }

    return 0;
}

///------------------------------------------///

Compilation message (stderr)

numbers.cpp: In function 'int main()':
numbers.cpp:65:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |         freopen(TASK".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
numbers.cpp:66:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |         freopen(TASK".OUT","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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