AtCoder Regular Contest 080: D - Grid Coloring

solution

ヘビ。$O(HW)$。平面上のロシアゲー（構築ゲー）を解くためのそこそこ一般的なテクについて - Learning Algorithms。

implementation

#!/usr/bin/env python3
h, w = map(int, input().split())
n = int(input())
a = list(map(int, input().split()))
i = 0
for y in range(h):
    row = []
    for _ in range(w):
        row += [ i + 1 ]
        a[i] -= 1
        if a[i] == 0:
            i += 1
    if y % 2 == 1:
        row = reversed(row)
    print(*row)