Compilare: user.cpp: In function ‘int search_sum(int, int)’: user.cpp:19:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s1>=0 && i<=N){ ^ user.cpp: In function ‘int main()’: user.cpp:42:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=N;i++) ^ user.cpp:45:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=N;i++) ^ user.cpp:47:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=2*v[N];i++) ^ user.cpp: In function ‘int search_sum(int, int)’: user.cpp:39:1: warning: control reaches end of non-void function [-Wreturn-type] } ^