View Compilation Error

0_0_7766752_32224.cpp: In function `int Directed_MST(int, int, int)':
0_0_7766752_32224.cpp:22: error: name lookup of `i' changed for new ISO `for' scoping
0_0_7766752_32224.cpp:20: error:   using obsolete binding at `i'
0_0_7766752_32224.cpp: In function `int dis(int, int)':
0_0_7766752_32224.cpp:74: error: `abs' undeclared (first use this function)
0_0_7766752_32224.cpp:74: error: (Each undeclared identifier is reported only once for each function it appears in.)