Compilare: main.cpp: In function 'int main()': main.cpp:29:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ind[i] < v[i].size()) { ~~~~~~~^~~~~~~~~~~~~ main.cpp:47:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ind[i] < v[i].size() && out[v[i][ind[i]]] == true) { ~~~~~~~^~~~~~~~~~~~~ main.cpp:51:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (same == false && ind[i] < v[i].size()) ~~~~~~~^~~~~~~~~~~~~