Submission #35792

#	Time	Username	Problem	Language	Result	Execution time	Memory
35792		funcsr	Palindrome-Free Numbers (BOI13_numbers)	C++14	100 / 100	0 ms	2268 KiB

numbers

#include <cstdio>
#include <iostream>
#include <algorithm>
#include <string>
#include <cstring>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <cmath>
#include <iomanip>
#include <cassert>
#include <bitset>
using namespace std;

typedef pair<int, int> P;
#define rep(i, n) for (int i=0; i<(n); i++)
#define all(c) (c).begin(), (c).end()
#define uniq(c) c.erase(unique(all(c)), (c).end())
#define index(xs, x) (int)(lower_bound(all(xs), x) - xs.begin())
#define _1 first
#define _2 second
#define pb push_back
#define INF 1145141919
#define MOD 1000000007

long long A, B;
long long dp[20][10][10][3][2];
long long solve(string X) {
  rep(i, X.size()+1) rep(j, 10) rep(k, 10) rep(l, 3) rep(r, 2) dp[i][j][k][l][r] = 0;
  dp[0][0][0][0][0] = 1;
  rep(i, X.size()) {
    int ud = X[i]-'0';
    rep(j, 10) {
      rep(k, 10) {
        rep(s, 3) {
          rep(r, 2) {
            if (dp[i][j][k][s][r] == 0) continue;
            rep(next, 10) {
              if (s == 1 && k == next) continue;
              if (s == 2 && (k == next || j == next)) continue;
              if (r == 0 && next > ud) continue;
              int ns = s;
              if (ns == 0) {
                if (next) ns++;
              }
              else if (ns == 1) ns++;
              dp[i+1][k][next][ns][r|(next<ud)] += dp[i][j][k][s][r];
            }
          }
        }
      }
    }
  }
  long long s = 0;
  rep(i, 10) rep(j, 10) rep(k, 3) rep(r, 2) s += dp[X.size()][i][j][k][r];
  return s;
}

signed main() {
  ios::sync_with_stdio(false); cin.tie(0);
  cin >> A >> B;
  long long s = solve(to_string(B));
  if (A > 0) s -= solve(to_string(A-1));
  cout << s << "\n";
  return 0;
}

Compilation message (stderr)

numbers.cpp: In function 'long long int solve(std::__cxx11::string)':
numbers.cpp:17:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 #define rep(i, n) for (int i=0; i<(n); i++)
                                  ^
numbers.cpp:30:3: note: in expansion of macro 'rep'
   rep(i, X.size()+1) rep(j, 10) rep(k, 10) rep(l, 3) rep(r, 2) dp[i][j][k][l][r] = 0;
   ^
numbers.cpp:17:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 #define rep(i, n) for (int i=0; i<(n); i++)
                                  ^
numbers.cpp:32:3: note: in expansion of macro 'rep'
   rep(i, X.size()) {
   ^

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