Compilare: main.cpp: In function 'void solve()': main.cpp:18:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<s.size(); i++){ ~^~~~~~~~~ main.cpp:21:33: 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:20:18: warning: unused variable 'ok' [-Wunused-variable] bool ok = true; ^~ main.cpp:26:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<s.size(); i++) ~^~~~~~~~~ main.cpp:29:33: 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:36:37: 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:42:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<ans.size(); i++){ ~^~~~~~~~~~~