View Compilation Error

0_0_8529120_32213.cpp: In function `void solve()':
0_0_8529120_32213.cpp:57: error: `first' has not been declared
0_0_8529120_32213.cpp:57: error: request for member of non-aggregate type before '/' token
0_0_8529120_32213.cpp:57: error: `second' has not been declared
0_0_8529120_32213.cpp:57: error: request for member of non-aggregate type before '%' token