Compilare: main.cpp: In function 'int main()': main.cpp:42:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < P.size(); i++ ) ~~^~~~~~~~~~ main.cpp:49:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < P.size() && 1LL * P[i] * P[i] <= save && N != 1; i++ ){ ~~^~~~~~~~~~