View Compilation Error

0_0_8277613_25415.cpp:16: error: size of array `w' is too large
0_0_8277613_25415.cpp: In function `long long int dijkstra(int)':
0_0_8277613_25415.cpp:34: error: `w' undeclared (first use this function)
0_0_8277613_25415.cpp:34: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8277613_25415.cpp: In function `void read_graph()':
0_0_8277613_25415.cpp:60: error: `w' undeclared (first use this function)