Lesson4 單元的題目偏向簡單
主要都是在考你知不知道起始值跟結束值會不會設定
(⭐ 代表加碼題目)

• ⭐ Count to N

a = int(input())

for i in range (a):
    print(i+1)

• Series - 1
  ✨ 注意結束值

a = int(input())
b = int(input())

for i in range (a, b+1):
    print(i)

• ⭐ First N odd, ascending
  ✨ 注意結束值和間隔值

a = int(input())
for i in range (1, a+1, 2):
    print(i)

• Series - 2

a = int(input())
b = int(input())

if a>b:
    for i in range (a, b-1, -1):
        print(i)
else:
    for i in range (a, b+1, 1):
        print(i)

• ⭐ First N even, descending
  ✨ 注意，這裡要遞減喔

a = int(input())
for i in range (a, -1, -1):
    if i%2==0:
        print(i)

• Sum of ten numbers

sum = 0
for i in range(10):
    sum += int(input())
print(sum)

• Sum of N numbers

a = int(input())
sum = 0
for i in range(a):
    sum += int(input())
print(sum)

• ⭐ Product of N numbers

a = int(input())
sum = 1
for i in range(a):
    sum *= int(input())
print(sum)

• Sum of cubes

a = int(input())
sum = 0
for i in range (0, a+1, 1):
    sum += i**3
print(sum)

• Factorial

a = int(input())
ans = 1

for i in range (1, a+1):
    ans *= i

print(ans)

• The number of zeros

a = int(input())
sum = 0
for i in range (a):
    if int(input()) == 0:
        sum += 1

print(sum)

• Adding factorials
  ✨ 這裡可能需要兩層迴圈

a = int(input())
sum = 0
for i in range (1, a+1):
    temp = 1
    for j in range (1, i+1):
        temp *= j
    sum += temp
print(sum)

• ⭐ Squares in range

a = int(input())
b = int(input())
for i in range (a, b+1):
    print('{}*{}={}'.format(i, i, i*i))

• Ladder

a = int(input())
for i in range(1, a+1):
    for j in range (1, i+1):
        print(j, sep='', end="")
    print("")

• ⭐ Is prime

n = int(input())
answer = 'PRIME'
for i in range(2, n - 1):
    if n % i == 0:
        answer = 'COMPOSITE'
print(answer)

• ⭐ Print primes in range
  ✨ 可以先寫下來，找關係

a = int(input())
b = int(input())

for i in range(a, b+1):
    for j in range (2, i):
        if (i%j)==0:
            break
    else:
        print(i)

• ⭐ Number of primes in range
  ✨ 如果上一題做得出來，這一題應該沒問題

a = int(input())
b = int(input())
sum = 0

for i in range(a, b+1):
    for j in range (2, i):
        if (i%j)==0:
            break
    else:
        sum += 1
print(sum)

• Lost card
  ✨ 梯行公式：(上底➕下底)✖️高➗2

a = int(input())
sum = 0
total = int((1+a)*a/2)

for i in range (1, a):
    sum += int(input())

print(total-sum)