View Compilation Error

0_0_10733428_19909.cpp: In function `int main()':
0_0_10733428_19909.cpp:106: error: `k' undeclared (first use this function)
0_0_10733428_19909.cpp:106: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_10733428_19909.cpp:37: error: too few arguments to function `void add_edge(int, int)'
0_0_10733428_19909.cpp:116: error: at this point in file