Compilare: user.cpp: In function ‘int binsearch(int)’: user.cpp:18:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i+step<n && sum[i+step]<=x) ^ user.cpp: In function ‘int main()’: user.cpp:49:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i+step<=S) ^ user.cpp:60:5: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(last==S) ++i; ^