Codeforces Testing Round 4

Solutions for Codeforces Testing Round 4 (contest 147). 2/2 problems verified against sample I/O. Difficulty range: 1300-2500.

2 items

Codeforces Testing Round 4

Type: Special | Problems: 2 | Verified: 2/2 | Rating range: 1300-2500 | Time: 2m 45s

Problem Name Rating Tags Solve Time Verified
A Punctuation 1300 implementation, strings 1m 18s ✓
B Smile House 2500 binary-search, graphs, matrices 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