Compilare: main.cpp: In function 'int main()': main.cpp:49:22: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 49 | while( s1.size() < n ) | ~~~~~~~~~~^~~ main.cpp:74:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 74 | for( i = 1 ; i <= s1.size() ; i++ ) { | ~~^~~~~~~~~~~~ main.cpp:59:16: warning: iteration 250000 invokes undefined behavior [-Waggressive-loop-optimizations] 59 | inv[i] = binpow( p26[i] , MOD - 2 ); | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:57:20: note: within this loop 57 | for( i = 1 ; i <= MAXM ; i++ ) { | ~~^~~~~~~