Compilare: main.cpp:2:73: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] using namespace std;ifstream f("vila2.in");ofstream g("vila2.out");main(){int N,K;f>>N>>K;K++;vector<int> V(N);for(auto &i:V)f>>i;deque<int>Dmx(1,0),Dmn(1,0);int dfmx=0;for(int i=1;i<N;i++){if(i>=K){while(!Dmx.empty() && Dmx.front()<=i-K)Dmx.pop_front();while(!Dmn.empty() && Dmn.front()<=i-K)Dmn.pop_front();}while(!Dmx.empty()&&V[i]>V[Dmx.back()])Dmx.pop_back();Dmx.push_back(i);while(!Dmn.empty()&&V[i]<V[Dmn.back()])Dmn.pop_back();Dmn.push_back(i);dfmx=max(dfmx,V[Dmx.front()]-V[Dmn.front()]);}g<<dfmx;} ^