Tell the topics which you think are very commonly used in Div 2 Crated for Div 2 C problems and if possible share a problem link.↵
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<spoiler summary="prefix-sum">greedy">↵
[Chamo and Mocha's Array 1975C](https://codeforces.net/contest/1975/problem/C)↵
<br>↵
[Permutation Counting 1972C](https://codeforces.net/contest/1972/problem/C)↵
</spoiler>↵
↵
<spoiler summary="binary-search">↵
[Job Interview 1976C](https://codeforces.net/contest/1976/problem/C)↵
</spoiler>↵
↵
↵
<spoiler summary="binary-search">constructive-algorithms">↵
[Turtle and an Incomplete Sequence 1981C](https://codeforces.net/contest/1981/problem/C)↵
<br>↵
[Cat, Fox and Double Maximum 1973C](https://codeforces.net/contest/1973/problem/C)↵
</spoiler>↵
↵
<spoiler summary="dp">↵
[Minimizing the Sum 1969C](https://codeforces.net/contest/1969/problem/C)↵
</spoiler>↵
↵
↵
<spoiler summary="
[Chamo and Mocha's Array 1975C](https://codeforces.net/contest/1975/problem/C)↵
<br>↵
[Permutation Counting 1972C](https://codeforces.net/contest/1972/problem/C)↵
</spoiler>↵
↵
<spoiler summary="binary-search">↵
[Job Interview 1976C](https://codeforces.net/contest/1976/problem/C)↵
</spoiler>↵
↵
[Turtle and an Incomplete Sequence 1981C](https://codeforces.net/contest/1981/problem/C)↵
<br>↵
[Cat, Fox and Double Maximum 1973C](https://codeforces.net/contest/1973/problem/C)↵
</spoiler>↵
↵
<spoiler summary="dp">↵
[Minimizing the Sum 1969C](https://codeforces.net/contest/1969/problem/C)↵
</spoiler>↵
↵