View Compilation Error

0_0_11555900_32074.cpp: In function `int find_boom(int)':
0_0_11555900_32074.cpp:7: error: `k' undeclared (first use this function)
0_0_11555900_32074.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11555900_32074.cpp:11: error: `oo' undeclared (first use this function)