Macro cp_library_rs::in_ex

macro_rules! in_ex {
    ($arr:expr ; $include:expr , $exclude:expr) => { ... };
    ($arr:expr ; $in0:expr , $ex0:expr $(; $in_i:expr , $ex_i:expr)+) => { ... };
}

高次元配列に対して包除原理を適用する

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2次元累積和の実装例

use cp_library_rs::in_ex;

// 3次元累積和
let a = [[1, 2], [3, 4]];
let mut s = [[0; 3]; 3];

for i in 0..2 {
    for j in 0..2 {
        s[i+1][j+1] = a[i][j] - in_ex!(s; i+1,i; j+1,j);
    }
}

assert_eq!(s, [[0, 0, 0], [0, 1, 3], [0, 4, 10]]);