Compilare: main.c: In function 'main': main.c:43:15: warning: unused variable 'j' [-Wunused-variable] int x, y, j; ^ main.c:37:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d %d", &n, &m, &e); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:45:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &x, &y); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~