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Submission #637456

# Submission time Handle Problem Language Result Execution time Memory
637456 2022-09-01T20:28:05 Z glome Palindrome-Free Numbers (BOI13_numbers) C++17
100 / 100
 1 ms 388 KB 
#include <bits/stdc++.h>
 
using namespace std;

long long dp[19][11][11][2][2];

string num;

long long rec(int pos, int prev1, int prev2, int f, int prev) {
    if(pos == num.size()) return 1;

    if(dp[pos][prev1][prev2][prev][f] != -1) return dp[pos][prev1][prev2][prev][f];
    
    int LIM = 9;
    if(!f) LIM = num[pos] - '0';
    
    long long res = 0;

    for (int i = 0; i<=LIM; i++) {
        if(prev) {
            if(i == prev2 || i == prev1) continue;
            res += rec(pos + 1, i, prev1, (f || i < LIM), prev);
        }
        else {
            res += rec(pos + 1, (i != 0 ? i : 10), prev1, (f || i < LIM), (i != 0));
        }
    }
    return dp[pos][prev1][prev2][f][prev] = res;


}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    long long a,b, k = 0;
    cin >> a >> b;
    if(a == 0) k += 1;
    memset(dp, -1, sizeof(dp)); num = to_string(b);
    b = rec(0, 10, 10, 0, 0);
    a = max(a-1, 0LL);
    memset(dp, -1, sizeof(dp)); num = to_string(a);

    cout << b - rec(0, 10, 10, 0, 0) + k << '\n';
    return 0;
}

Compilation message

numbers.cpp: In function 'long long int rec(int, int, int, int, int)':
numbers.cpp:10:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |     if(pos == num.size()) return 1;
      |        ~~~~^~~~~~~~~~~~~

Subtask #1
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 384 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 0 ms 340 KB Output is correct

Subtask #2
75.0 / 75.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 388 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 384 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 316 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 1 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 1 ms 340 KB Output is correct
32 Correct 1 ms 340 KB Output is correct
33 Correct 1 ms 384 KB Output is correct
34 Correct 1 ms 340 KB Output is correct
35 Correct 1 ms 340 KB Output is correct
36 Correct 1 ms 340 KB Output is correct
37 Correct 1 ms 340 KB Output is correct
38 Correct 1 ms 340 KB Output is correct
39 Correct 1 ms 340 KB Output is correct
40 Correct 1 ms 340 KB Output is correct
41 Correct 1 ms 340 KB Output is correct
42 Correct 1 ms 340 KB Output is correct
43 Correct 1 ms 340 KB Output is correct
44 Correct 1 ms 340 KB Output is correct
45 Correct 1 ms 340 KB Output is correct