Solution

Problem 1.O5,P5,P6,Q5,Q6,R5,R6,T5,O4,T4.

Problem 2. O6,N6,M6,M5,L5,M4,L4,N6,N7.

Problem 3.P5,O4,N6,N4,M4,M5,N5,M3,L4,N2,O5,O3,N3.

Problem 4. N5,N4,M4,N3,M3,N2,M2,N1,M1,O5,O6,M5,O1

Problem 5. O5,P4,N4,P5,P6