Codeforces Educational Round 115 Div 2 D: Training Session – Complementary Counting

Codeforces Educational Round 115 Div 2 D: Training Session – Complementary Counting and Map data structure Learning target: How to use complementary counting and a map data structure to solve a Combinatorics problem Problem Link: https://codeforces.com/contest/1598/problem/D Solution Link: https://codeforces.com/contest/1598/submission/131466154 Timestamps: 0:00 – Intro 0:34 – problem statement explanation 1:00 – Complementary counting idea 7:11 – Coding the solution