View Compilation Error

0_0_30045154_13388.cpp: In function 'int union_set(int, int, int)':
0_0_30045154_13388.cpp:28:16: error: return-statement with no value, in function returning 'int' [-fpermissive]
     if(fx==fy) return;
                ^
0_0_30045154_13388.cpp:29:9: error: invalid types 'int[int]' for array subscript
     d[fy]=fx;
         ^