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impl Solution {
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  pub fn num_special(M: Vec<Vec<i32>>) -> i32 {
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    let (nx, ny) = (M[0].len(), M.len());
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    let mut data_x = vec![0; nx];
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    let mut data_y = vec![0; ny];
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    for y in 0..ny {
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      for x in 0..nx {
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        if M[y][x] == 1 {
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          data_x[x] += 1;
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          data_y[y] += 1;
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        }
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      }
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    }
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    let mut res = 0;
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    for y in 0..ny {
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      for x in 0..nx {
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        if M[y][x] == 1 && data_x[x] == 1 && data_y[y] == 1 {
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          res += 1;
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        }
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      }
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    }
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    return res;
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  }
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}