1
We go to same school.
We go to the same school.
Use the before same: ‘the same school’, ‘the same problem’, ‘the same number’.
2
I have the same problem like you.
I have the same problem as you.
Use the same … as, not the same … like: ‘My phone is the same as yours.’
3
Last year there were the same number of accidents than this year.
Last year there were the same number of accidents that this year.
Last year there were the same number of accidents as this year.
Use as, not than or that, after the same number/amount: ‘We have the same number of employees as last year.’