Eroare de compilare: user.c: In function ‘main’: user.c:32:41: error: ‘k’ undeclared (first use in this function) sum+=(sum_array[k][j] - sum_array[k][i]); ^ user.c:32:41: note: each undeclared identifier is reported only once for each function it appears in user.c:10:9: warning: variable ‘sum_array’ set but not used [-Wunused-but-set-variable] int sum_array[n][n]; ^ user.c:9:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fp,"%i",&n); ^ user.c:18:19: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fp,"%i",&a); ^