View Compilation Error

0_0_12278874_5483.cpp: In function `int main()':
0_0_12278874_5483.cpp:23: error: `t' undeclared (first use this function)
0_0_12278874_5483.cpp:23: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_12278874_5483.cpp:24: error: `u' undeclared (first use this function)
0_0_12278874_5483.cpp:46: error: `source' undeclared (first use this function)
0_0_12278874_5483.cpp:46: error: `sink' undeclared (first use this function)
0_0_12278874_5483.cpp:51: error: `add_edge' undeclared (first use this function)
0_0_12278874_5483.cpp:58: error: `ans' undeclared (first use this function)
0_0_12278874_5483.cpp:61: error: name lookup of `i' changed for new ISO `for' scoping
0_0_12278874_5483.cpp:47: error:   using obsolete binding at `i'
0_0_12278874_5483.cpp:65: error: `maxflow' undeclared (first use this function)