Why does this Rust code takes twice the time to run compared to C++?

Hello,
I am very new to Rust (started just a few days).

I have created the following codes in Rust and C++:

// Rust code
fn main() {
    let n:u128 = 1_000_000_000;
    let mut s:u128 = 0;

    for i in 1..=n {
        if i == 125468716 {
            s += 2*i;
        }
        s += i;
    }

    println!("Sum value: {s}");
}

and

// C++ code
#include <iostream>

int main() {

\tunsigned long long n = 1000000000;

\tunsigned long long s = 0;

\tfor (unsigned long long i = 1; i <= n; i++) {
            if (i == 125468716) {
                s += 2*i;
\t    }
\t    s += i;
\t}

\tstd::cout << "Sum: " << s << std::endl;
\treturn 0;

}

Using rustc 1.60.0 (7737e0b5c 2022-04-04), I have compiled the code as follows:

rustc -O main.rs -o rust_code

And for C++ code, I have used g++ (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0 , as follows:

g++ -O2 main.cpp -o cpp_code

When I run the two codes:

$ time ./rust_code 
Sum value: 500000000750937432

real\t0m1.419s
user\t0m1.412s
sys\t0m0.009s

$ time ./cpp_code 
Sum: 500000000750937432

real\t0m0.733s
user\t0m0.733s
sys\t0m0.000s

Why does the rust code take twice the time to run compared to C++ code?

Am I doing something wrong?

Thank you