Compilare: user.cpp: In function ‘int main()’: user.cpp:12:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d\n",&n); ^ user.cpp:66:27: warning: array subscript is below array bounds [-Warray-bounds] x[i-1]=1-x[i-1]; ^ user.cpp:66:18: warning: array subscript is below array bounds [-Warray-bounds] x[i-1]=1-x[i-1]; ^