Compilare: main.cpp: In function 'int main()': main.cpp:30:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(sum.size()<k){ ~~~~~~~~~~^~ main.cpp:35:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(sum.size()==k && v[i].c>(*sum.begin())){ ~~~~~~~~~~^~~ main.cpp:59:23: warning: 'poz' may be used uninitialized in this function [-Wmaybe-uninitialized] x=maxk[poz]; ~~~~~~~~^