Compilare: user.c: In function ‘main’: user.c:34:5: warning: implicit declaration of function ‘memset’ [-Wimplicit-function-declaration] memset(ult, -1, sizeof ult); ^ user.c:34:5: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] user.c:30:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &t); ^ user.c:32:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &n, &m); ^ user.c:37:13: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &x, &y); ^ user.c:64:24: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(grad[i] & 1 && i != p) ^