Compilare: user.c: In function ‘bun’: user.c:7:28: warning: variable ‘l2’ set but not used [-Wunused-but-set-variable] int i, j, k, st, dr, l1, l2, n2 = (n / 2), m2 = (m / 2); ^ user.c: In function ‘main’: user.c:45:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d%d%d", &n, &m, &l, &c); ^ user.c:52:13: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lld", &ma[i][j]); ^