Compilare: user.cpp: In function ‘int main()’: user.cpp:32:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = j = 0; i < positive.size() && j < negative.size(); ) { ^ user.cpp:32:60: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = j = 0; i < positive.size() && j < negative.size(); ) { ^ user.cpp:16:26: warning: variable ‘sum’ set but not used [-Wunused-but-set-variable] int n, m, i, j, x, y, sum; ^