门牌制作

res = 0

for i in range(1, 2021):
    a = list(str(i))
    res += a.count('2')

print(res)
624

即约分数

total=0
def f(a,b):
	x = a % b
	while (x != 0):
		a = b
		b = x
		x = a % b
	return b
for i in range(1,2021):
	for j in range(1,2021):
		if f(i,j)==1:
			total+=1
print(total)
2481215

蛇形填数

lis = [[0]*100 for row in range(100)]
num = 1  
for i in range(1,101):  
    for j in range(i):
        if i % 2 == 0:  
            lis[j][i-j-1] = num
        else:
            lis[i-j-1][j] = num
        num += 1

print(lis[19][19])
761

跑步锻炼

week=6
run=0
for i in range(2000,2021):
    for mouth in range(1,13):
        if i == 2020 and mouth in [10,11,12] :
            break
        if mouth==2 and (i%400==0 or (i%4==0 and i%100!=0)):
            day=29
        elif mouth in [1,3,5,7,8,10,12]:
            day=31
        elif mouth in [4,6,9,11]:
            day=30
        else:
        	day=28
        for k in range(1,day+1):
            if k==1 or week==1:
                run+=2
            else:run+=1
            week+=1
            if week==8:
                week=1
print(run)
8879

七段码

7+10+16+20+19+7+1=80

成绩统计

n = int(input())
a, b = 0, 0
for i in range(n):
    s = int(input())
    if s >= 85:
        a += 1
        b += 1
    elif s >= 60:
        b += 1
b = int(b / n * 100)
a = int(a / n * 100)
print(str(b) + "%")
print(str(a) + "%")

字串字符和

看别人的，差不多明白了
list1=list(input())
list2=[-1 for i in range(26)]
count=0

for i in range(len(list1)):
    index=ord(list1[i])-ord('a')
    count+=(len(list1)-i)*(i-list2[index])
    list2[index]=i

print(count)