arbnr.cpp: In function 'void paranthesis_form(int, int)': arbnr.cpp:13: warning: comparison between signed and unsigned integer expressions arbnr.cpp: In function 'int main()': arbnr.cpp:56: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result arbnr.cpp:57: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result arbnr.cpp:59: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result arbnr.cpp:61: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result arbnr.cpp:65: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result