Compilare: main.cpp: In function 'bool solve(ll)': main.cpp:44:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<n;++i) ~^~ main.cpp:49:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<n;++i) ~^~ main.cpp:57:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<n;++i) if(c[n-1][i]<v[n-1][i]) return 0; ~^~ main.cpp: In function 'int main()': main.cpp:63:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<n;++i) ~^~ main.cpp:72:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(q>m) ~^~ main.cpp:81:27: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] ll st=s,dr=1LL<<64-1,mij,r; ~~^~