Compilare: user.c: In function ‘main’: user.c:21:16: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] for (fscanf(f, "%d", &t); t; t--){ ^ user.c:23:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d", &n, &m); ^ user.c:31:23: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &A[i][j]); ^ user.c:53:40: warning: ‘c’ may be used uninitialized in this function [-Wmaybe-uninitialized] if ((lc != lprec || cc != cprec) && (A[l][c] & (1 ^ user.c:53:25: warning: ‘l’ may be used uninitialized in this function [-Wmaybe-uninitialized] if ((lc != lprec || cc != cprec) && (A[l][c] & (1 ^