Compilare: user.c:6:39: warning: data definition has no type or storage class [enabled by default] unsigned int v[MAXN+1], val[2*MAXN+1];lista[2][MOD+1], next[2*MAXN+1], f[2*MAXN+1], m; ^ user.c:6:39: warning: type defaults to ‘int’ in declaration of ‘lista’ [enabled by default] user.c:6:56: warning: type defaults to ‘int’ in declaration of ‘next’ [enabled by default] unsigned int v[MAXN+1], val[2*MAXN+1];lista[2][MOD+1], next[2*MAXN+1], f[2*MAXN+1], m; ^ user.c:6:72: warning: type defaults to ‘int’ in declaration of ‘f’ [enabled by default] unsigned int v[MAXN+1], val[2*MAXN+1];lista[2][MOD+1], next[2*MAXN+1], f[2*MAXN+1], m; ^ user.c:6:85: warning: type defaults to ‘int’ in declaration of ‘m’ [enabled by default] unsigned int v[MAXN+1], val[2*MAXN+1];lista[2][MOD+1], next[2*MAXN+1], f[2*MAXN+1], m; ^ user.c: In function ‘main’: user.c:54:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &n, &l, &u); ^ user.c:56:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%u", &v[i]); ^