Compilare: user.cpp: In function ‘void bfs_multi_source(const std::vector<std::pair<int, int> >&, std::vector<std::array<int, 1010u> >&)’: user.cpp:93:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if((unsigned)i < n && (unsigned)j < n && rez[i][j] == inf){ ^ user.cpp:93:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if((unsigned)i < n && (unsigned)j < n && rez[i][j] == inf){ ^ user.cpp: In function ‘int main()’: user.cpp:121:20: warning: unused variable ‘tmp’ [-Wunused-variable] for(int i = 0, tmp; i < n; ++i){ ^