Compilare: main.cpp: In function 'int main()': main.cpp:68:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(l1 < nums[lq].size() && l2 < nums[rq].size()) ~~~^~~~~~~~~~~~~~~~~ main.cpp:68:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(l1 < nums[lq].size() && l2 < nums[rq].size()) ~~~^~~~~~~~~~~~~~~~~ main.cpp:91:28: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized] fout << ans << '\n'; ^~~~