View Compilation Error

0_0_3259289_2679.cpp: In function `void solve()':
0_0_3259289_2679.cpp:22: error: `i' undeclared (first use this function)
0_0_3259289_2679.cpp:22: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3259289_2679.cpp:24: error: `j' undeclared (first use this function)