LEVEL 2 | Binary Search

Facebook: https://www.facebook.com/FUICPC problem 1: https://codeforces.com/edu/course/2/lesson/6/1/practice/contest/283911/problem/A first solution: https://codeforces.com/edu/course/2/lesson/6/1/practice/contest/283911/submission/251572378 second solution: https://codeforces.com/edu/course/2/lesson/6/1/practice/contest/283911/submission/251573101 problem 2: https://codeforces.com/contest/706/problem/B first solution: https://codeforces.com/contest/706/submission/251575202 second solution: https://codeforces.com/contest/706/submission/251575674 problem 3: https://codeforces.com/problemset/problem/165/B/ solution: https://codeforces.com/contest/165/submission/251577856 probelm 4: https://codeforces.com/contest/279/problem/B solution: https://codeforces.com/contest/279/submission/251581197 problem 5: https://vjudge.net/problem/SPOJ-FUCT_IF_SQRT solution: https://ideone.com/6r7M9J