Compilare: main.c: In function 'main': main.c:11:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &t); ^~~~~~~~~~~~~~~~~~~~~ main.c:13:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &n, &m, &x); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:16:13: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &v); ^~~~~~~~~~~~~~~~~~~~~ main.c:5:35: warning: 'nx' may be used uninitialized in this function [-Wmaybe-uninitialized] int t, i, j, n, m, x, v, sum, nx; ^~