after thinking for 2 hours i cant solve this problem https://codeforces.com/edu/course/2/lesson/9/1/practice/contest/307092/problem/C can someone help me?
after thinking for 2 hours i cant solve this problem https://codeforces.com/edu/course/2/lesson/9/1/practice/contest/307092/problem/C can someone help me?
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Create a count map for array $$$b$$$, say $$$cnt$$$. Then iterate over $$$a$$$ and for each $$$a_i$$$, $$$ans$$$ is increased by $$$cnt[a_i]$$$. cmiiw!
Thanks a lot, it really helped me