Compilare: user.cpp: In function ‘int main()’: user.cpp:18:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;++i) ^ user.cpp:21:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;++i) ^ user.cpp:31:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p1>amax) ^ user.cpp:38:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=sol;++i) ^ user.cpp:43:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;++i) ^ user.cpp:44:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i!=poz) ^ user.cpp:49:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p1!=p2+p3+p4) ^ user.cpp:54:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p1!=p2+p3+p4) ^ user.cpp:59:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p1!=p2+p3+p4) ^ user.cpp:41:9: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] int ok=1; ^