412. Sislovesme -

import sys

2 4 2 1 4 3 5 2 3 1 5 4

A is an unordered pair i , j ( i ≠ j ) such that 412. Sislovesme

Because a, b is a mutual‑love pair, we have love[a] = b and love[b] = a . Assume without loss of generality that a < b . import sys 2 4 2 1 4 3