View Compilation Error

0_0_3829047_14301.cpp: In function `void merge(int, int)':
0_0_3829047_14301.cpp:25: error: `i' undeclared (first use this function)
0_0_3829047_14301.cpp:25: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3829047_14301.cpp:25: error: `j' undeclared (first use this function)