Compilare: user.cpp: In function ‘int main()’: user.cpp:98:41: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 3 has type ‘std::vector<std::pair<int, int> >::size_type {aka unsigned int}’ [-Wformat=] fprintf(out, "%ld\n", resultVect.size()); ^ user.cpp:61:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &N, &M); ^ user.cpp:69:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d %d", &x, &y, &c); ^