Compilare: main.cpp: In function 'int main()': main.cpp:105:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 105 | for(int i=0;i<a.size();i++){ | ~^~~~~~~~~ main.cpp:94:9: warning: 'y1' may be used uninitialized [-Wmaybe-uninitialized] 94 | if(y1=='S'){ | ^~ main.cpp:44:14: note: 'y1' was declared here 44 | char x1, y1; | ^~ main.cpp:91:13: warning: 'x1' may be used uninitialized [-Wmaybe-uninitialized] 91 | if(x1=='E') | ^~ main.cpp:44:10: note: 'x1' was declared here 44 | char x1, y1; | ^~