Compilare: main.c: In function 'main': main.c:48:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d%d", &n, &m, &k ); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:50:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d", &lin[i], &col[i] ); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~