牛客21312 神秘餐馆

题目描述
一家神秘餐馆准备开放N天，牛牛 和 牛妹听到这个消息后，准备尽可能多的一起去吃午饭

餐馆有M道菜，牛牛和牛妹每次来只允许点一道菜，如果在第i天买了第j道菜
那么第i+7天也只能买第j道菜
第i天第j道菜的价格为price[i][j]
‘0’-'9’代表0-9美元
‘A’-'Z’代表10-35美元
‘a’-'z’代表36-61美元

牛牛和牛妹一共只有budget美元，请问他们最多可以吃几天的午饭

n, m, budget = map(int, input().split())
ll = []
for i in range(n):
    ll.append([])
    for j in range(m):
        ll[i].append(0)
l = []
for i in range(n):
    l = input()
    for j in range(m):
        ll[i][j] = l[j]

for i in range(n):
    for j in range(m):
        if '0'<=ll[i][j]<='9':
            ll[i][j] = ord(ll[i][j]) - ord('0')
        elif 'A'<=ll[i][j]<='Z':
            ll[i][j] = ord(ll[i][j]) - ord('A') + 10
        elif 'a'<=ll[i][j]<='z':
            ll[i][j] = ord(ll[i][j]) - ord('a') + 36
a = []
for i in range(7):
    a.append([])
    for j in range(m):
        a[i].append(0)
b = []
cost = [0,0,0,0,0,0,0]
money = 0
for i in range(n):
    money -= cost[i%7];
    for j in range(m):
        a[i%7][j] += ll[i][j]
        b.append(a[i%7][j])
    cost[i%7] = min(b)
    money += cost[i%7]
    b = []
   
    if money > budget:
        print(i)
        break
else:
    print(n)