Compilare: main.cpp: In function 'int main()': main.cpp:21:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<=n;i++){ ~^~~ main.cpp:24:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<n;i++){ ~^~ main.cpp:28:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int d=2;d<n;d++){ ~^~ main.cpp:29:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n-d;i++){ ~^~~~~