Compilare: main.cpp: In function 'int main()': main.cpp:132:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (z = 0; z < marcei.size(); z++) ~~^~~~~~~~~~~~~~~ main.cpp:111:6: warning: unused variable 'i' [-Wunused-variable] int i, j, k, ii, jj, z; ^ main.cpp:111:9: warning: unused variable 'j' [-Wunused-variable] int i, j, k, ii, jj, z; ^