Compilare: user.cpp: In function ‘void eul(int)’: user.cpp:25:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0;j < v[nod].size();j++) { ^ user.cpp: In function ‘int main()’: user.cpp:38:19: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] r(f, "%d", &N); ^ user.cpp:41:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] r(f, "%d%d", &x, &y); ^ user.cpp:63:19: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] r(f, "%d", &M); ^ user.cpp:66:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] r(f, "%d%d", &x, &y); ^