Recursion
Problem - 257D - Codeforces題意： 給數列 a，滿足 a[ i ] ≤ a[ i + 1 ] ≤ 2 * a[ i ]。要求對每項定正負，使得總和介於 [ 0, a[ 0 ] ]。資料規模： The first line contains integer n (1 ≤ n ≤ 1e5) — the size of the array. The second line contains s…
Problem - 257D - Codeforces題意： 給數列 a，滿足 a[ i ] ≤ a[ i + 1 ] ≤ 2 * a[ i ]。要求對每項定正負，使得總和介於 [ 0, a[ 0 ] ]。資料規模： The first line contains integer n (1 ≤ n ≤ 1e5) — the size of the array. The second line contains s…
