Compilare: main.cpp: In function 'int main()': main.cpp:26:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s.size()+n-i-1<k&&s.size()<k) ~~~~~~~~~~~~~~^~ main.cpp:26:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s.size()+n-i-1<k&&s.size()<k) ~~~~~~~~^~ main.cpp:30:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s.size()+n-i-1>=k&&s.top()<=c[i]) ~~~~~~~~~~~~~~^~~ main.cpp:33:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s.size()+n-i-1>=k&&s.top()<=c[i]&&s.size()>0) ~~~~~~~~~~~~~~^~~