View Compilation Error

0_0_13037991_26847.cpp: In function `bool spfa(int)':
0_0_13037991_26847.cpp:44: error: `id' undeclared (first use this function)
0_0_13037991_26847.cpp:44: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_13037991_26847.cpp: In function `int main()':
0_0_13037991_26847.cpp:92: error: `love1' undeclared (first use this function)