Compilare: main.cpp: In function 'int main()': main.cpp:65:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < v[x].size(); j++) { ~~^~~~~~~~~~~~~ main.cpp:86:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[u].size(); i++) { ~~^~~~~~~~~~~~~ main.cpp:76:6: warning: unused variable 'count' [-Wunused-variable] int count = 0; ^~~~~