Submission #30006107

Source Code Expand

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use proconio::input;
fn main() {
    input! {
        n: usize,
    };
    let ans = (n - 1) * n / 2;
    println!("{}", ans);
}
 
 
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use proconio::input;

fn main() {
    input! {
        n: usize,
    };
    let ans = (n - 1) * n / 2;
    println!("{}", ans);
}

Submission Info

Judge Result