Compilare: main.cpp: In function 'bool solve_testcase()': main.cpp:33:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < str1.size(); i++) ~~^~~~~~~~~~~~~ main.cpp:34:16: warning: array subscript has type 'char' [-Wchar-subscripts] ap1[str1[i]]++, ap2[str2[i]]++, sol[i] = 0; ^ main.cpp:34:32: warning: array subscript has type 'char' [-Wchar-subscripts] ap1[str1[i]]++, ap2[str2[i]]++, sol[i] = 0; ^