背景:
给定一个列表,给定一个数值,取列表中和为给定数值的两个元素或者3个元素。
举个例子:
给定列表为:numbers = [2, 7, 11, 15]
给定数值为:target = 9
取列表中那两个元素之和为9
献上代码:
numbers = [2, 7, 11, 15]
target = 9
def MakeSum(numbers,sum):
for i in range(len(numbers)-1):
for j in range(i+1,len(numbers)):
if numbers[i] + numbers[j] == sum:
print([i,j])
MakeSum(numbers,target)
执行结果:
如果想取列表中的三个元素之和为20的呢?
numbers = [2, 7, 11, 15]
target = 20
def MakeSum(numbers,sum):
for i in range(len(numbers)-1):
for j in range(i+1,len(numbers)):
if numbers[i] + numbers[j] == sum:
print([i,j])
for k in range(j+1,len(numbers)):
if numbers[i] + numbers[j] + numbers[k] == sum:
print([i,j,k])
MakeSum(numbers,target)
执行结果:
如果列表中2个数值的合为18,3个数值的合也为18呢?
上述代码可以满足该情况的。
numbers = [9,2, 7, 11, 15]
target = 18
def MakeSum(numbers,sum):
for i in range(len(numbers)-1):
for j in range(i+1,len(numbers)):
if numbers[i] + numbers[j] == sum:
print([i,j])
for k in range(j+1,len(numbers)):
if numbers[i] + numbers[j] + numbers[k] == sum:
print([i,j,k])
MakeSum(numbers,target)
执行结果为: