Compilare: user.cpp: In function ‘void kosoraju()’: user.cpp:45:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int x = 0; x < cond_vec.size(); ++x){ ^ user.cpp: In function ‘void build_tree()’: user.cpp:56:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < components.size(); ++i) if(in_deg[i] == 0) st.push(i); ^ user.cpp:63:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < components.size(); ++i) val[i] = components[i].size(); } ^ user.cpp: In function ‘std::vector<long long int> convolute(const std::vector<long long int>&, const std::vector<long long int>&)’: user.cpp:67:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < a.size(); ++i){ ^ user.cpp:68:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < b.size(); ++j){ ^ user.cpp: In function ‘int main()’: user.cpp:109:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k + 1 >= x.size()) g << 0 << endl; ^