Compilare: main.cpp: In function 'void solve()': main.cpp:32:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<s.size(); i++){ ~^~~~~~~~~ main.cpp:37:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<s.size(); i++){ ~^~~~~~~~~ main.cpp:40:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=2*(i+2); j<s.size()+2; j+=(i+2)){ ~^~~~~~~~~~~ main.cpp:47:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<s.size(); i++){ ~^~~~~~~~~ main.cpp:49:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=2*(i+2); j<s.size()+2; j+=(i+2)){ ~^~~~~~~~~~~ main.cpp:56:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<ans.size(); i++){ ~^~~~~~~~~~~