View Compilation Error

0_0_6410869_29329.cpp: In function `int dtw(int, int, int)':
0_0_6410869_29329.cpp:8: error: return-statement with no value, in function returning 'int'
0_0_6410869_29329.cpp:9: error: return-statement with no value, in function returning 'int'
0_0_6410869_29329.cpp:10: error: `abs' undeclared (first use this function)
0_0_6410869_29329.cpp:10: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6410869_29329.cpp:11: error: return-statement with no value, in function returning 'int'