12 lines
455 B
Rust
12 lines
455 B
Rust
pub fn missing_number(numbers: Vec<i32>) -> i32 {
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// The range of numbers can be described as the total sum of all possible
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// numbers in that range.
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let total_range = (0..=numbers.len() as i32).sum::<i32>();
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// And since only one number is missing from that range, the difference
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// between the range's sum and the numbers' sum will be that missing number.
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let sum_of_numbers = numbers.iter().sum::<i32>();
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total_range - sum_of_numbers
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}
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