Compilare: user.c: In function ‘main’: user.c:14:5: warning: implicit declaration of function ‘memset’ [-Wimplicit-function-declaration] memset(v, 0, sizeof v); ^ user.c:14:5: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] user.c:8:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d%d", &n, &m, &x); ^ user.c:11:13: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &ma[i][j]); ^