Compilare: user.cpp: In function ‘void V(short int)’: user.cpp:11:32: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] if(y*2<L&&c[H[x]]>c[H[y<<1+1]]) ^ user.cpp:12:16: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] x=y<<1+1; ^ user.cpp: In function ‘int main()’: user.cpp:17:88: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cezar.in","r",stdin),freopen("cezar.out","w",stdout),scanf("%hd%hd",&n,&l); ^ user.cpp:17:88: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:17:88: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:19:52: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%hd%hd",u+i,v+i),w[u[i]]++,w[v[i]]++; ^