Compilare: main.cpp: In function 'int main()': main.cpp:30:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=N;i++) ~^~~ main.cpp:46:17: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized] if( (*it) < ans ) ans=*it; ^~