Sponsored
Watch expert explanations and walkthroughs
猩猩的乐园
Huifeng Guan
Math Geeks
X Loves D&M&B
Code-Yao
Pepcoding
H William Polenz
Variations on a theme
Roel Van de Paar
Solve with full IDE support and test cases
![leetcode1003 Check If Word Is Valid After Substitutions [Chinese]](/_next/image?url=https%3A%2F%2Fi.ytimg.com%2Fvi%2FzQY_eMDw0sQ%2Fhq720.jpg%3Fsqp%3D-oaymwEXCNAFEJQDSFryq4qpAwkIARUAAIhCGAE%3D%26rs%3DAOn4CLBeAHbYT9qco1-DD1WiU8HWSoBHpA&w=256&q=75)
