Submission #1192137

#	Time	Username	Problem	Language	Result	Execution time	Memory
1192137		27augain	Palindrome-Free Numbers (BOI13_numbers)	C++20	72.50 / 100	1 ms	400 KiB

numbers

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

#define MASK(i) (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1LL)

using ll = long long;

const int mxn = 9 + 1e6;
const int inf = 0x3f3f3f3f;
const ll lnf = 0x3f3f3f3f3f3f3f3f;

string s;
ll dp[18][11][11][2];

ll DP(int id, int lst1, int lst2, bool f) {
  if (id == (int) (s.size())) {
    return true;
  }
  if (lst1 != 10 && lst2 != 10 && dp[id][lst1][lst2][f] != -1) {
    return dp[id][lst1][lst2][f];
  }
  ll res = 0;
  for (int c = 0; c <= (f ? s[id] - '0' : 9); ++c) {
    bool nwf = false;
    if (f && c == s[id] - '0') {
      nwf = true;
    }
    if (c != lst1 && c != lst2) {
      res += DP(id + 1, c, lst1, nwf);
    }
  }
  return dp[id][lst1][lst2][f] = res;
}

ll solve(ll x) {
  s = to_string(x);
  memset(dp, -1, sizeof(dp));
  return DP(0, 10, 10, true);
}

void _27augain(void) {
  ll l, r;
  cin >> l >> r;
  cout << solve(r) - solve(l - 1) << "\n";
}

int32_t main(void) {
#define task "27augain"
  cin.tie(0)->sync_with_stdio(0);
  for (string iext : {"in", "inp"}) {
    if (fopen((task "." + iext).c_str(), "r")) {
      freopen((task "." + iext).c_str(), "r", stdin);
      freopen(task ".out", "w", stdout);
    }
  }
  int testcase = 1;
  // cin >> testcase;
  while (testcase--) {
    _27augain();
  }
  return 0;
}

Compilation message (stderr)

numbers.cpp: In function 'int32_t main()':
numbers.cpp:53:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   53 |       freopen((task "." + iext).c_str(), "r", stdin);
      |       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
numbers.cpp:54:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   54 |       freopen(task ".out", "w", stdout);
      |       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 12.5 / 25
• Subtask 2: 60 / 75