View Compilation Error

0_0_1654696_11740.cpp: In function `void output()':
0_0_1654696_11740.cpp:77: error: `fout' undeclared (first use this function)
0_0_1654696_11740.cpp:77: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1654696_11740.cpp: In function `void init()':
0_0_1654696_11740.cpp:98: error: `fin' undeclared (first use this function)
0_0_1654696_11740.cpp: In function `void solve(int)':
0_0_1654696_11740.cpp:312: error: `fout' undeclared (first use this function)