From now on, I will add some **topic wise problems** which I face regularly. I think it will help new commers like me. Thank you :)

### 1.Cumulative sum/ prefix sum :

(https://codeforces.com/problemset/problem/363/B)

(https://codeforces.com/problemset/problem/313/B)

(https://codeforces.com/problemset/problem/1363/B)

(https://codeforces.com/problemset/problem/433/B)

(https://codeforces.com/problemset/problem/296/C)

(https://codeforces.com/problemset/problem/816/B)

(https://codeforces.com/problemset/problem/1341/B)

(https://codeforces.com/problemset/problem/961/B)

(https://codeforces.com/problemset/problem/276/C)

(https://codeforces.com/problemset/problem/1678/B1)

(https://codeforces.com/problemset/problem/1678/B1)

(https://www.spoj.com/problems/CSUMQ/en/)

(https://www.spoj.com/problems/RANGESUM/en/)

(https://www.codechef.com/problems/QUALPREL)

(https://www.codechef.com/problems/PTMSSNG)

(https://www.codechef.com/problems/MEX)

(https://www.codechef.com/problems/PTMSSNG)

(https://www.eolymp.com/en/problems/6959)

(https://onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=924)

Here are some **Binary search** related problems

### 2.Binary Search

(https://codeforces.com/problemset/problem/474/B)

(https://lightoj.com/problem/points-in-segments)

(https://lightoj.com/problem/counting-triangles)

(https://lightoj.com/problem/points-in-segments-ii)

(https://lightoj.com/problem/crossed-ladders)

### 3. Even Odd integers counting in a range inclusive [l,r]:

Numbers of even integers is a range inclusive *[l,r] = (r/2)-(l-1)/2*

Numbers of odd integers is a range inclusive ** [l,r] = (r-l+1)-( (r/2)-(l-1)/2 )** Practice: https://codeforces.com/problemset/problem/1629/B

Thank you :)

Thanks a lot :)

welcome

thanks !

wc

:)

Auto comment: topic has been updated by Avoid_ASM70 (previous revision, new revision, compare).Auto comment: topic has been updated by Avoid_ASM70 (previous revision, new revision, compare).Auto comment: topic has been updated by Avoid_ASM70 (previous revision, new revision, compare).what is the difficulty range of these problems?

mostly under 1200 Some are under 1400

Auto comment: topic has been updated by Avoid_ASM70 (previous revision, new revision, compare).nice

Thanks man,