Compilare: main.cpp: In function 'int main()': main.cpp:26:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long long i=2; i<=n; i++){ ~^~~ main.cpp:29:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1; j<=k&&j<i; j++) ~^~~ main.cpp:25:9: warning: unused variable 'x' [-Wunused-variable] int x=2,I=2,J=1; ^