Compilare: main.c: In function 'main': main.c:16:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &p); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:22:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &v[0][i]); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:41:17: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &v[0][j]); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:79:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &v[0][i]); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:108:7: warning: 'last' may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(fout, "\n%d", last + 1); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~