paianjen.cpp: In function 'void recon(int, int)': paianjen.cpp:14: warning: comparison between signed and unsigned integer expressions paianjen.cpp: In function 'int main()': paianjen.cpp:84: warning: comparison between signed and unsigned integer expressions paianjen.cpp:44: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result paianjen.cpp:45: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result paianjen.cpp:46: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result paianjen.cpp:49: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result paianjen.cpp:50: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result paianjen.cpp:54: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result