Compilare: main.cpp: In function 'void solve()': main.cpp:39:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | for(int i=1;i<s.size();i++) | ~^~~~~~~~~ main.cpp:49:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 49 | for(int i=0;i<s.size();i++) | ~^~~~~~~~~ main.cpp:54:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 54 | if(r<s.size()) | ~^~~~~~~~~ main.cpp:64:9: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | if(l==s.size()) | ~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:80:16: warning: iteration 1000005 invokes undefined behavior [-Waggressive-loop-optimizations] 80 | pow1[i]=pow1[i-1]*p%mod1; | ~~~~~~~^~~~~~~~~~~~~~~~~ main.cpp:78:18: note: within this loop 78 | for(int i=1;i<=Nmax;i++) | ~^~~~~~