Compilare: user.cpp: In function ‘int main()’: user.cpp:51:20: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (j-k>=1&&j+k<=n) if (a[j-k].c==a[j+k].c) {a[j-k].b=2;a[j+k].b=0;y=j+k+1;x=2*k-1;} ^ user.cpp:17:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&v,&n,&x); ^ user.cpp:20:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&y); ^