Explain the deadlock detection and resource allocation in below?

Deadlock Detection Request matrix Q Allocation matrix A \begin{tabular}{|c|c|c|c|c} \multicolumn{1}{c}{ R1 } & R2 & R3 & R4 & R5 \\ \hline 0 & 0 & 0 & 0 & 1 \\ \hline \end{tabular} Allocation vector W Figure 6.10 Example for Deadlock Detection Mark P4, since A(P4)=(0,0,0,0,0) W=(0,0,0,0,1) Mark P3, since Q(P3) is less than or equal to W, W=W+A(P3)=(0,0,0,1,1) Leave P1 \& P2 unmarked, i.e. P1 \& P2 are deadlocked