Submission #474772

#TimeUsernameProblemLanguageResultExecution timeMemory
474772Duy_ePalindrome-Free Numbers (BOI13_numbers)C++14
0 / 100
3 ms460 KiB
#include <bits/stdc++.h> #define ll long long #define ull unsigned long long #define pii pair<long long, long long> #define st first #define nd second #define file "test" using namespace std; const long long oo = 1e18; const long long N = 2e5 + 5; ll dp[20][11][11][2][2]; vector <int> num; ll cal(int pos, int pre, int cur, bool f, bool lz){ if (pos == num.size()) return 1; ll &ans = dp[pos][pre][cur][f][lz]; if (ans != - 1) return ans; ans = 0; ll lmt = num[pos]; if (f) lmt = 9; for (int i = 0; i <= lmt; i ++) if (i != pre && i != cur){ bool new_f = f, new_lz = lz & (i == 0); int new_pre, new_cur; if (f == 0 && i < lmt) new_f = 1; if (new_lz) new_pre = new_cur = 10; else { new_cur = i; if (lz) new_pre = 10; else new_pre = cur; } ans += cal(pos + 1, new_pre, new_cur, new_f, new_lz); } return ans; } ll solve(ll n){ memset(dp, -1, sizeof dp); if (n <= 0) return 0; num.clear(); while (n > 0) num.push_back(n%10), n/=10; reverse(num.begin(), num.end()); return cal(0, 10, 10, 0, 1); } int main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); #ifndef ONLINE_JUDGE freopen(file".inp","r",stdin); freopen(file".out","w",stdout); #endif ll A, B; cin >> A >> B; cout << solve(B) - solve(A - 1); return 0; } /** /\_/\ * (= ._.) * / >0 \>1 **/

Compilation message (stderr)

numbers.cpp: In function 'long long int cal(int, int, int, bool, bool)':
numbers.cpp:17:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |     if (pos == num.size()) return 1;
      |         ~~~~^~~~~~~~~~~~~
numbers.cpp: In function 'int main()':
numbers.cpp:57:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   57 |         freopen(file".inp","r",stdin); freopen(file".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
numbers.cpp:57:47: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   57 |         freopen(file".inp","r",stdin); freopen(file".out","w",stdout);
      |                                        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
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