Number of Ways to Split Array LeetCode solution in Rust

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impl Solution {
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  pub fn ways_to_split_array(nums: Vec<i32>) -> i32 {
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    let tot: i64 = nums.iter().map(|&v| v as i64).sum();
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    let mut cum = 0;
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    let mut ans = 0;
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    let n = nums.len();
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    for i in 0..n - 1 {
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      let v = nums[i] as i64;
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      cum += v;
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      let tail = tot - cum;
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      // println!("cum {cum}, tot - cum {tail}");
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      if cum >= tail {
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        ans += 1;
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      }
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    }
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    ans
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  }
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}