Compilare: main.cpp: In function 'std::vector<int> operator+(std::vector<int>, std::vector<int>)': main.cpp:16:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;((i!=A.size())||j!=B.size());) ~^~~~~~~~~~ main.cpp:16:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;((i!=A.size())||j!=B.size());) ~^~~~~~~~~~ main.cpp:17:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i==A.size()) ~^~~~~~~~~~ main.cpp:20:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j==B.size()) ~^~~~~~~~~~ main.cpp:28:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<ret.size();i++) ~^~~~~~~~~~~ main.cpp: In function 'std::vector<int> operator*(std::vector<int>, std::vector<int>)': main.cpp:37:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0,j=0;i<A.size();i++) ~^~~~~~~~~ main.cpp:39:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while((j<B.size())&&(B[j]<A[i])) ~^~~~~~~~~ main.cpp:41:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j==B.size()) ~^~~~~~~~~~