Codeforces Testing Round 4

2 problems from Codeforces Testing Round 4 (contest 147), difficulty 1300-2500. 2/2 solutions verified against sample I/O.

2 items

Codeforces Testing Round 4

Special | 2 problems | 2/2 verified | Difficulty 1300-2500 | 2m 45s

# Problem Rating Tags Accepted Time ✓
A Punctuation 1300 implementation, strings 4,235 1m 18s ✓
B Smile House 2500 binary-search, graphs, matrices 919 1m 27s ✓
Practice › Codeforces Solutions › Codeforces Testing Round 4 ›

CF 147A - Punctuation

We are given a string containing lowercase letters, spaces, and a limited set of punctuation marks: comma, dot, exclamation mark, and question mark.
codeforces competitive-programming implementation strings May 29, 2026
Practice › Codeforces Solutions › Codeforces Testing Round 4 ›

CF 147B - Smile House

We are given a set of rooms connected by doors, where each door has two mood values: one for each direction. Petya can move from room to room, and every move adds to his mood according to the direction-specific value.
codeforces competitive-programming binary-search graphs matrices May 29, 2026