atac2.cpp: In function 'int main()': atac2.cpp:106: warning: comparison between signed and unsigned integer expressions atac2.cpp:112: warning: comparison between signed and unsigned integer expressions atac2.cpp:86: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result atac2.cpp:87: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result atac2.cpp:89: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result atac2.cpp:91: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result atac2.cpp:93: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result