Compilare: main.cpp: In function 'int ver(int)': main.cpp:26:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(stk[0].size()==m) ~~~~~~~~~~~~~^~~ main.cpp:33:43: warning: unused variable 'cnt' [-Wunused-variable] int z=stk[1].top().y,val=stk[1].top().x,cnt=stk[0].size(); ^~~ main.cpp: In function 'int main()': main.cpp:67:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(n-i+stk[0].size()<m) ~~~~~~~~~~~~~~~~~^~ main.cpp:80:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(stk[0].size()<m) ~~~~~~~~~~~~~^~