久々にusize祭りｷﾀ━━━━(ﾟ∀ﾟ)━━━━!!

unsafe fn calc(bit: i32) -> i32 {
　if bit == 0 { return 0; };
　if DP[bit as usize] != -1 { return DP[bit as usize]; };

　let mut start_id: i32 = 0;
　for i in 1..=K_NUM { if bit & 1 << i == 0 { start_id += C_NUM[i]; }; }

　let mut res: i32 = i32::MAX;
　for i in 1..=K_NUM as i32 {
　　if bit & 1 << i > 0 {
　　　let mut end_id: i32 = start_id + C_NUM[i as usize];
　　　let mut num: i32 = end_id - start_id - (SUM[end_id as usize][i as usize] - SUM[start_id as usize][i as usize]);
　　　res = res.min(calc(bit ^ 1 << i) + num);
　　}
　}
　DP[bit as usize] = res;
　res
}