Compilare: main.cpp: In function 'int main()': main.cpp:83:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < centrale.size();i++){ ~~^~~~~~~~~~~~~~~~~ main.cpp:84:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0;j < blocuri.size();j++){ ~~^~~~~~~~~~~~~~~~ main.cpp:88:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < blocuri.size();i++){ ~~^~~~~~~~~~~~~~~~ main.cpp:89:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i + 1;j < blocuri.size();j++){ ~~^~~~~~~~~~~~~~~~ main.cpp:67:11: warning: unused variable 'j' [-Wunused-variable] int i,j; ^