Compilare: user.cpp: In function ‘void insert_Hash(unsigned int)’: user.cpp:16:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < M[x % MODO].size (); ++ i) { ~~^~~~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘int search_Hash(unsigned int)’: user.cpp:27:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < M[x % MODO].size (); ++ i) { ~~^~~~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:39:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= n; ++ i) { ~~^~~~ user.cpp:43:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2; i <= n; ++ i) { ~~^~~~ user.cpp:44:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i + 1; j <= n; ++ j) { ~~^~~~