```
input = [10,18,20,5,11,2,10,15]
sum = 20
length = len(input)
for i in range(length):
for j in range(i+1, length):
if(input[i] + input[j] == sum):
print(input[i], input[j])
```

and the output is

```
10 10
18 2
5 15
```

```
input = [10,18,20,5,11,2,10,15]
sum = 20
length = len(input)
for i in range(length):
for j in range(i+1, length):
if(input[i] + input[j] == sum):
print(input[i], input[j])
```

and the output is

```
10 10
18 2
5 15
```

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## Top comments (1)

Another solution would be to use a map(or a dictionary in python, AFAIK) where each key would follow this rule: sum - list[i];