Compilare: main.cpp: In function 'void z_(const std::string&)': main.cpp:30:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | for(int i = 1; i < s.size(); i ++) | ~~^~~~~~~~~~ main.cpp:37:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | while (i + z[i] < s.size() && s[z[i]] == s[i + z[i]]) | ~~~~~~~~~^~~~~~~~~~ main.cpp: In function 'void precalc()': main.cpp:53:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | for(int i = 0; i < s.size(); i ++) | ~~^~~~~~~~~~ main.cpp:60:41: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 60 | for(int i = 0; i + (1 << shift) <= s.size(); i ++) | ~~~~~~~~~~~~~~~~~^~~~~~~~~~~ main.cpp:62:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 62 | if (i + (1 << (shift - 1)) < s.size()) | ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:79:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 79 | for(int i = 0; i < s.size(); i ++) | ~~^~~~~~~~~~ main.cpp:81:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 81 | if(i + z[i] == s.size() && z[i]) | ~~~~~~~~~^~~~~~~~~~~ main.cpp:91:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 91 | if (st >= 0 && st < s.size() && (dr - (1 << lg) + 1) >= 0 && (dr - (1 << lg) + 1) < s.size()) | ~~~^~~~~~~~~~ main.cpp:91:95: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 91 | if (st >= 0 && st < s.size() && (dr - (1 << lg) + 1) >= 0 && (dr - (1 << lg) + 1) < s.size()) | ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~ main.cpp:96:13: warning: 'maxi' may be used uninitialized [-Wmaybe-uninitialized] 96 | if(maxi >= z[i]) | ^~ main.cpp:89:17: note: 'maxi' was declared here 89 | int maxi; | ^~~~