20240830 finished.

This commit is contained in:
jackfiled 2024-08-30 11:28:00 +08:00
parent 31ceeb32cd
commit 1945a07426
2 changed files with 52 additions and 1 deletions

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@ -220,3 +220,4 @@ mod p698_partition_to_k_equal_sum_subsets;
mod p3134_find_the_median_of_the_uniqueness_array;
mod p3144_minimum_substring_partition_of_equal_character_frequency;
mod p3142_check_if_grid_satisfies_conditions;
mod p3153_sum_of_digit_differences_of_all_pairs;

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@ -0,0 +1,50 @@
/**
* [3153] Sum of Digit Differences of All Pairs
*/
pub struct Solution {}
// submission codes start here
impl Solution {
pub fn sum_digit_differences(nums: Vec<i32>) -> i64 {
let n = nums.len() as i64;
let mut result = 0;
let mut base = 1;
loop {
if nums[0] / base == 0 {
break;
}
let mut map = vec![0; 10];
for &num in nums.iter() {
let digit = (num / base % 10) as usize;
map[digit] += 1;
}
result += map.iter().filter_map(|x| if *x == 0 {
None
} else {
Some(*x * (n - *x))
}).sum::<i64>() / 2;
base *= 10;
}
result
}
}
// submission codes end
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_3153() {
assert_eq!(4, Solution::sum_digit_differences(vec![13, 23, 12]));
assert_eq!(0, Solution::sum_digit_differences(vec![10, 10, 10, 10]));
}
}