Compilare: main.cpp: In function 'int main()': main.cpp:31:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for (int i=0; i<a.size(); i++){ | ~^~~~~~~~~ main.cpp:35:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | for (int i=0; i<b.size(); i++){ | ~^~~~~~~~~ main.cpp:36:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | if (i<a.size()){ | ~^~~~~~~~~ main.cpp:37:20: warning: 'hashB' may be used uninitialized [-Wmaybe-uninitialized] 37 | hashB=(hashB+1ll*b[i]*p2)%MOD; | ^~~~~ main.cpp:26:15: note: 'hashB' was declared here 26 | int hashA,hashB,p1=1,p2=1,baza=31,inv; | ^~~~~ main.cpp:42:9: warning: 'hashA' may be used uninitialized [-Wmaybe-uninitialized] 42 | if (hashA==hashB){ | ^~ main.cpp:26:9: note: 'hashA' was declared here 26 | int hashA,hashB,p1=1,p2=1,baza=31,inv; | ^~~~~