Compilare: user.cpp: In function ‘void dijkstra(int, int, std::unordered_set<int>&, std::vector<std::vector<std::pair<int, int> > >&)’: user.cpp:79:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(unsigned int i = 1; i <= n; i++) { ^ user.cpp:80:72: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(distance[i] < min && fortarete.find(i) != fortarete.end() && i != source) { ^ user.cpp: In function ‘int main()’: user.cpp:99:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &n, &m, &k); ^ user.cpp:116:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &indice_fortareata); ^ user.cpp:125:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &x, &y, &cost); ^