colina.cpp: In function 'void read()': colina.cpp:62: warning: comparison between signed and unsigned integer expressions colina.cpp:76: warning: comparison between signed and unsigned integer expressions colina.cpp:97: warning: comparison between signed and unsigned integer expressions colina.cpp:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result colina.cpp:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result colina.cpp:48: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result