Compilare: user.cpp: In function ‘int main()’: user.cpp:70:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p < v[0].size() && p < v[1].size() && v[0][p].first == v[1][p].first) { ~~^~~~~~~~~~~~~ user.cpp:70:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p < v[0].size() && p < v[1].size() && v[0][p].first == v[1][p].first) { ~~^~~~~~~~~~~~~ user.cpp:74:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p < v[0].size() && p < v[1].size() && stramos(v[0][p].first, v[1][p].first)) ~~^~~~~~~~~~~~~ user.cpp:74:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p < v[0].size() && p < v[1].size() && stramos(v[0][p].first, v[1][p].first)) ~~^~~~~~~~~~~~~