learnings Competitive programming.md

Learnings

linear combination of integers can form k if k% gcd(elements) is zero.

• PRoblem : https://www.codechef.com/SEPT19A/problems/FUZZYLIN
• reference : https://stackoverflow.com/questions/47583925/how-to-check-if-an-integer-is-linear-combination-of-elements-in-an-array/47584726#47584726

constraint of equation ax2+2bxy+cy2>0 is b2-ac<0

• PRoblem : https://www.codechef.com/SEPT19A/problems/LAPD

sample learning

• explanation :
• PRoblem :
• reference :