Compilare: user.cpp: In function ‘bool f(t)’: user.cpp:8:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<n;++i) ^ user.cpp:12:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<n;++i) ^ user.cpp:18:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<n;++i) ^ user.cpp: At global scope: user.cpp:23:6: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] main() ^ user.cpp: In function ‘int main()’: user.cpp:26:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < n; ++i) ^ user.cpp:35:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(q>m)m=q,l=i; ^ user.cpp:41:25: warning: left shift count >= width of type [enabled by default] t st=s,dr=1<<64-1,mij,r; ^ user.cpp:41:20: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] t st=s,dr=1<<64-1,mij,r; ^