Compilare: user.cpp: In function ‘int main()’: user.cpp:108:43: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 3 has type ‘std::vector<edge>::size_type {aka unsigned int}’ [-Wformat=] fprintf(output, "%ld\n", result.size()); ^ user.cpp:89:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(input, "%ld %ld", &N, &M); ^ user.cpp:95:59: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(input, "%ld %ld %ld", &src, &dest, &weight); ^