Match The Rhyme

Mr. $X$ now decides to conduct a party for all the participants of the rhyme match participants. There he placed $n$ led tiles from led to the right. Initially, all tiles are off. Each tile is connected to its own piezoelectric disc. When a person stamps at the $ith$ piezoelectric disc the $ith$ tiles get switched on to yellow color. The tile once switched on will not be switched off. The tile wil