for i in range(2,p+1):
时间: 2024-06-07 12:07:12 浏览: 5
This is a Python code snippet that initializes a for loop with a range of values from 2 to p+1. The loop variable is 'i', which takes on each value in the range in turn. The purpose of the loop is not clear without more context, but it could be used for a variety of tasks, such as checking if each value in the range is prime, or performing some calculation for each value in the range.
相关问题
row=int(input()) if row==0: print(0) else: dp=[[0 for i in range(row+1)] for j in range(row+1)] # python中创建二维列表 for i in range(row): line=input().split() for j in range(i+1): dp[i+1][j+1]=int(line[j]) # print(dp) for k in range(2,row+1): for p in range(1,k+1): dp[k][p]=max(dp[k-1][p-1],dp[k-1][p])+dp[k][p] last=dp[-1] max=-1 for elem in last: if elem>max: max=elem print(max) 此代码增加一段输出最大值路径的代码
要输出最大值路径,可以在动态规划过程中记录每个位置来自哪个位置,最终回溯路径即可。具体代码如下:
```
row=int(input())
if row==0:
print(0)
else:
dp=[[0 for i in range(row+1)] for j in range(row+1)]
path=[[-1 for i in range(row+1)] for j in range(row+1)] # 记录路径
for i in range(row):
line=input().split()
for j in range(i+1):
dp[i+1][j+1]=int(line[j])
for k in range(2,row+1):
for p in range(1,k+1):
if dp[k-1][p-1]>dp[k-1][p]:
dp[k][p]=dp[k-1][p-1]+dp[k][p]
path[k][p]=p-1
else:
dp[k][p]=dp[k-1][p]+dp[k][p]
path[k][p]=p
last=dp[-1]
max=-1
max_index=-1
for i, elem in enumerate(last):
if elem>max:
max=elem
max_index=i
# 回溯路径
res=[max_index]
for i in range(row-1,0,-1):
max_index=path[i+1][max_index+1]
res.insert(0,max_index)
print(max)
print('->'.join(str(x) for x in res))
```
在输出最大值之后,加上了一个回溯路径的过程,将路径按顺序输出即可。
n=input() p=n.lower() m=input() for i in range(0,len(n)): if "," in n or "+" in n or "-" in n or "." in n: if m[i:i+1:1].isupper()==True: m=m.replace(m[i:i+1:1],"") m=m.replace(n[i:i+1:1],"") m=m.replace(p[i:i+1:1],"") print(m)改错
在 for 循环中,需要判断当前字符是否为字母,否则在使用 `m.replace()` 函数时会出错。同时,在判断当前字符是否为大写字母时,可以直接使用 `isupper()` 函数,不需要与 `True` 进行比较。修改后的代码如下:
```
n = input()
p = n.lower()
m = input()
for i in range(0, len(n)):
if n[i].isalpha():
if "," in n or "+" in n or "-" in n or "." in n:
if m[i].isupper():
m = m.replace(m[i], "")
m = m.replace(n[i], "")
m = m.replace(p[i], "")
print(m)
```
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