4. 20 números

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fn main() { let mut arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]; println!("Array original: {:?}", arr); if arr[0] == 1 { arr[0] = 19; } if arr[1] == 2 { arr[1] = 20; } if arr[2] == 3 { arr[2] = 18; } if arr[3] == 4 { arr[3] = 16; } if arr[4] == 5 { arr[4] = 17; } if arr[5] == 6 { arr[5] = 15; } if arr[6] == 7 { arr[6] = 14; } if arr[7] == 8 { arr[7] = 13; } if arr[8] == 9 { arr[8] = 12; } if arr[9] == 10 { arr[9] = 11; } if arr[10] == 11 { arr[10] = 9; } if arr[11] == 12 { arr[11] = 8; } if arr[12] == 13 { arr[12] = 10; } if arr[13] == 14 { arr[13] = 7; } if arr[14] == 15 { arr[14] = 4; } if arr[15] == 16 { arr[15] = 6; } if arr[16] == 17 { arr[16] = 5; } if arr[17] == 18 { arr[17] = 1; } if arr[18] == 19 { arr[18] = 3; } if arr[19] == 20 { arr[19] = 2; } println!("Array modificado: {:?}", arr); }
arr[1] = 4; arr[2] = 4; arr[3] = 4; arr[4] = 1; arr[5] = 1; arr[6] = 4; arr[7] = 4; arr[8] = 4; arr[9] = 4; arr[10] = 4; if arr[18] == 19 { arr[1] = 19; } if arr[19] == 20 { arr[0] = 20; } if arr[14] == 15 { arr[5] = 15; } if arr[15] == 16 { arr[4] = 16; } if arr[16] == 17 { arr[3] = 17; } if arr[17] == 18 { arr[2] = 18; }
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