Compilare: user.cpp: In function ‘int main()’: user.cpp:89:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (v_minim.size() >= n - 1) ^ user.cpp:98:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v_minim.size(); i++) ^ user.cpp:124:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v_minim.size();) ^ user.cpp:161:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (v_minim.size() >= n - 1) ^ user.cpp:170:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v_minim.size(); i++) ^ user.cpp:62:28: warning: unused variable ‘nr’ [-Wunused-variable] int n, m, cost_total = 0, nr = 0, ok = 1; ^