Compilare: user.cpp: In function ‘int main()’: user.cpp:47:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p < v[0].size() && p < v[1].size() && v[0][p] == v[1][p]) { ~~^~~~~~~~~~~~~ user.cpp:47:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p < v[0].size() && p < v[1].size() && v[0][p] == v[1][p]) { ~~^~~~~~~~~~~~~ user.cpp:51:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p < v[0].size() && p < v[1].size() && v[0][p].second == v[1][p].second) { ~~^~~~~~~~~~~~~ user.cpp:51:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p < v[0].size() && p < v[1].size() && v[0][p].second == v[1][p].second) { ~~^~~~~~~~~~~~~