Compilare: main.cpp: In function 'int main()': main.cpp:31:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(sum.size()<k){ ~~~~~~~~~~^~ main.cpp:36:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(sum.size()==k) ~~~~~~~~~~^~~ main.cpp:61:24: warning: 'poz' may be used uninitialized in this function [-Wmaybe-uninitialized] if(maxk[poz]<d[1]) ~~~~~~~~^