Compilare: main.cpp: In function 'int main()': main.cpp:16:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(d.size()>u or(d.size()>l and sum-d.front().first>sum)) { ~~~~~~~~^~ main.cpp:16:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(d.size()>u or(d.size()>l and sum-d.front().first>sum)) { ~~~~~~~~^~