litere.cpp: In function 'int main()': litere.cpp:24: warning: comparison between signed and unsigned integer expressions litere.cpp:33: warning: comparison between signed and unsigned integer expressions litere.cpp:36: warning: comparison between signed and unsigned integer expressions litere.cpp:39: warning: comparison between signed and unsigned integer expressions litere.cpp:42: warning: comparison between signed and unsigned integer expressions litere.cpp:45: warning: comparison between signed and unsigned integer expressions litere.cpp:58: warning: comparison between signed and unsigned integer expressions litere.cpp:8: warning: unused variable 'l'