colina.cpp: In function 'int main()': colina.cpp:41: warning: comparison between signed and unsigned integer expressions colina.cpp:44: warning: comparison between signed and unsigned integer expressions colina.cpp:45: warning: comparison between signed and unsigned integer expressions colina.cpp:50: warning: comparison between signed and unsigned integer expressions colina.cpp:58: warning: comparison between signed and unsigned integer expressions colina.cpp:61: warning: comparison between signed and unsigned integer expressions colina.cpp:62: warning: comparison between signed and unsigned integer expressions colina.cpp:66: warning: comparison between signed and unsigned integer expressions