Compilare: user.c: In function ‘main’: user.c:16:22: warning: unused variable ‘sc’ [-Wunused-variable] int i, j, s = 0, sc = 0, sl = 0, sin = 0; ^ user.c:18:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &n, &m); ^ user.c:22:19: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &a[i][j]); ^