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Commit 73cc484

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author
guangsheng.li01
committed
Solved 1012
1 parent 23d77ca commit 73cc484

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2 files changed

+82
-0
lines changed

2 files changed

+82
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lines changed
Lines changed: 81 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,81 @@
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/*
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* [1012] numbers-with-repeated-digits
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*/
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pub struct Solution {}
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// solution impl starts here
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impl Solution {
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pub fn num_dup_digits_at_most_n(n: i32) -> i32 {
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n - Self::digit_dp(n)
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}
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fn digit_dp(n: i32) -> i32 {
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let mut n = n;
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let mut digits = Vec::new();
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while n > 0 {
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digits.push(n % 10);
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n /= 10;
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}
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let k = digits.len();
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let mut used: [i32; 10] = [0; 10];
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let mut total = 0;
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for i in 1..k {
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total += 9 * Self::a(9, i as i32 - 1);
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}
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for i in 0..k {
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let i = k - 1 - i;
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let num = digits[i];
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for j in (if i == k - 1 { 1 } else { 0 })..num {
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if used[j as usize] != 0 {
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continue;
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}
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total += Self::a((10 - k + i) as i32, i as i32);
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}
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used[num as usize] += 1;
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if used[num as usize] > 1 {
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break;
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}
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if i == 0 {
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total += 1;
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}
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}
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total
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}
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fn a(a: i32, b: i32) -> i32 {
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Self::fact(a) / Self::fact(a - b)
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}
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fn fact(n: i32) -> i32 {
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if n == 0 || n == 1 {
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return 1;
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}
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return n * Self::fact(n - 1);
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}
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}
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// solution impl ends here
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// solution tests starts here
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_case0() {
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assert_eq!(Solution::num_dup_digits_at_most_n(20), 1);
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assert_eq!(Solution::num_dup_digits_at_most_n(100), 10);
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assert_eq!(Solution::num_dup_digits_at_most_n(1000), 262);
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}
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}
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// solution tests ends here

‎src/lib.rs

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -38,6 +38,7 @@ mod a0937_reorder_data_in_log_files;
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mod a0949_largest_time_for_given_digits;
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mod a0973_k_closest_points_to_origin;
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mod a0980_unique_paths_iii;
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mod a1012_numbers_with_repeated_digits;
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mod a1018_binary_prefix_divisible_by_5;
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mod a1021_remove_outermost_parentheses;
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mod a1047_remove_all_adjacent_duplicates_in_string;

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