View Compilation Error

0_0_14171031_28084.cpp: In function 'int spfa()':
0_0_14171031_28084.cpp:31:13: error: 'p' was not declared in this scope
         if (p.x == 0 || p.x == height - 1 || p.y == 0 || p.y == width - 1)
             ^