ppcover.cpp: In function 'int solve(int, int, int, int, int, int)': ppcover.cpp:155: warning: unused variable 'i' ppcover.cpp:155: warning: unused variable 'j' ppcover.cpp:155: warning: unused variable 'k' ppcover.cpp: In function 'int main()': ppcover.cpp:204: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result ppcover.cpp:205: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result ppcover.cpp:207: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result ppcover.cpp:209: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result ppcover.cpp:214: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result