Compilare: user.c: In function ‘main’: user.c:9:19: warning: unused variable ‘x’ [-Wunused-variable] int n, k, i, j, x; ^ user.c:10:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &n, &k); ^ user.c:13:13: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &sump[i][j]); ^