Compilare: main.cpp:2:90: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] using namespace std;ifstream f("patrat.in");ofstream g("patrat.out");map<int,int> M;main(){for(int i=1;i<=141;i++)for(int j=i+1;i*i+j*j<=20000;j++)M[i*i+j*j]++;int x,y;f>>x>>y;for(int i=x;i<=y;i++)if(M[i]>=2)g<<i<<'\n';if(!g.tellp())g<<0;} ^