Compilare: main.cpp: In function 'int main()': main.cpp:17:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(!res.empty() && res.size()-1+n-i>=l && res.top()<c[i]) ~~~~~~~~~~~~~~~~^~~ main.cpp:19:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(res.size()<l) ~~~~~~~~~~^~ main.cpp:11:18: warning: unused variable 'x' [-Wunused-variable] int n, k, l, x; ^