mirror of
https://github.com/krahets/hello-algo.git
synced 2024-12-27 01:16:29 +08:00
e720aa2d24
* Sync recent changes to the revised Word. * Revised the preface chapter * Revised the introduction chapter * Revised the computation complexity chapter * Revised the chapter data structure * Revised the chapter array and linked list * Revised the chapter stack and queue * Revised the chapter hashing * Revised the chapter tree * Revised the chapter heap * Revised the chapter graph * Revised the chapter searching * Reivised the sorting chapter * Revised the divide and conquer chapter * Revised the chapter backtacking * Revised the DP chapter * Revised the greedy chapter * Revised the appendix chapter * Revised the preface chapter doubly * Revised the figures
65 lines
1.4 KiB
Python
65 lines
1.4 KiB
Python
"""
|
|
File: iteration.py
|
|
Created Time: 2023-08-24
|
|
Author: Krahets (krahets@163.com)
|
|
"""
|
|
|
|
|
|
def for_loop(n: int) -> int:
|
|
"""for 循环"""
|
|
res = 0
|
|
# 循环求和 1, 2, ..., n-1, n
|
|
for i in range(1, n + 1):
|
|
res += i
|
|
return res
|
|
|
|
|
|
def while_loop(n: int) -> int:
|
|
"""while 循环"""
|
|
res = 0
|
|
i = 1 # 初始化条件变量
|
|
# 循环求和 1, 2, ..., n-1, n
|
|
while i <= n:
|
|
res += i
|
|
i += 1 # 更新条件变量
|
|
return res
|
|
|
|
|
|
def while_loop_ii(n: int) -> int:
|
|
"""while 循环（两次更新）"""
|
|
res = 0
|
|
i = 1 # 初始化条件变量
|
|
# 循环求和 1, 4, 10, ...
|
|
while i <= n:
|
|
res += i
|
|
# 更新条件变量
|
|
i += 1
|
|
i *= 2
|
|
return res
|
|
|
|
|
|
def nested_for_loop(n: int) -> str:
|
|
"""双层 for 循环"""
|
|
res = ""
|
|
# 循环 i = 1, 2, ..., n-1, n
|
|
for i in range(1, n + 1):
|
|
# 循环 j = 1, 2, ..., n-1, n
|
|
for j in range(1, n + 1):
|
|
res += f"({i}, {j}), "
|
|
return res
|
|
|
|
|
|
"""Driver Code"""
|
|
if __name__ == "__main__":
|
|
n = 5
|
|
res = for_loop(n)
|
|
print(f"\nfor 循环的求和结果 res = {res}")
|
|
|
|
res = while_loop(n)
|
|
print(f"\nwhile 循环的求和结果 res = {res}")
|
|
|
|
res = while_loop_ii(n)
|
|
print(f"\nwhile 循环（两次更新）求和结果 res = {res}")
|
|
|
|
res = nested_for_loop(n)
|
|
print(f"\n双层 for 循环的遍历结果 {res}")
|