Compilare: user.cpp: In function ‘void change(int, int)’: user.cpp:46:17: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] change(st, st + dr >> 1); ~~~^~~~ user.cpp:47:13: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] change((st+dr>>1)+1, dr); ~~^~~ user.cpp: In function ‘void addtodp(std::__cxx11::string, std::__cxx11::string, int, char)’: user.cpp:80:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i >= a.size()) yg[i] = {0, 0}; ~~^~~~~~~~~~~ user.cpp:83:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i >= b.size()) yh[i] = {0, 0}; ~~^~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:125:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(used[x]) continue; ^ user.cpp:127:11: warning: array subscript has type ‘char’ [-Wchar-subscripts] used[x] = true; ^ user.cpp:133:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = a.size() - 1; i <= b.size() - 1; ++i){ ~~^~~~~~~~~~~~~~~ user.cpp:134:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(dp[i] == (a.size() - cnt)) ++ ans; ~~~~~~^~~~~~~~~~~~~~~~~~~