1.排序然后看相邻的元素之差是否大于4,太水了。。。
n=int(input())
a=[]
for i in range(n):
a.append(int(input()))
a.sort()
flag=True
for i in range(1,len(a)):
if a[i]-a[i-1]>4:
flag=False
break
a=[str(v) for v in a]
print(' '.join(a))
if flag:
print(1)
else:
print(0)
2.leetcode 原题 基本计算器III
def solve(s):
global idx
stk=[]
num=0
sign='+'
f=lambda x:ord(x)-ord('0')
while idx<len(s):
c=s[idx]
if c.isdigit():
num=num*10+f(c)
if c=='(':
idx+=1
num=solve(s)
if (not c.isdigit() and c!=' ')&nbs***bsp;idx==len(s)-1:
pre=0
if sign=='+':
stk.append(num)
elif sign=='-':
stk.append(-num)
elif sign=='*':
pre=stk.pop()
stk.append(pre*num)
elif sign=='/':
pre=stk.pop()
stk.append(pre//num)
sign=c
num=0
if c==')':
break
idx+=1
return sum(stk)
idx=0
s=input()
print(solve(s))
3.给9个样本,利用朴素贝叶斯对接下来输入的样本进行分类
buf=[[1,2,0,2,1],
[0,1,1,2,1],
[1,0,1,1,1],
[1,2,1,0,1],
[1,0,0,1,0],
[0,0,0,1,0],
[0,1,1,1,0],
[0,0,0,0,0],
[1,0,0,0,0]]
px=[[[0]*2 for j in range(3)] for i in range(4)]
for i in range(4):
for j in range(3):
cnt1=0
cnt0=0
for v in buf:
if v[i]==j and v[-1]==1:
cnt1+=1
if v[i]==j and v[-1]==0:
cnt0+=1
px[i][j][1]=cnt1/4
px[i][j][0]=cnt0/5
x=eval(input())
ans=[4/9,5/9]
for i in range(4):
for k in range(2):
ans[k]*=px[i][x[i]][k]
if ans[0]>ans[1]:
print(0)
else:
print(1)
#科大讯飞##科大讯飞笔试##投票#