Watch tutorials and explanations by expert teachers that walk through solving this problem.
EduEverybody
Huifeng Guan
Math Geeks
X Loves D&M&B
Code-Yao
Pepcoding
H William Polenz
Variations on a theme
Roel Van de Paar
Solve more problems to master this pattern
![leetcode1003 Check If Word Is Valid After Substitutions [Chinese]](https://i.ytimg.com/vi/zQY_eMDw0sQ/hq720.jpg?sqp=-oaymwEXCNAFEJQDSFryq4qpAwkIARUAAIhCGAE=&rs=AOn4CLBeAHbYT9qco1-DD1WiU8HWSoBHpA)
