CompileError!

main.cpp: In function \xe2\x80\x98int main()\xe2\x80\x99:\nmain.cpp:55:39: warning: comparison of integer expressions of different signedness: \xe2\x80\x98int\xe2\x80\x99 and \xe2\x80\x98std::__cxx11::basic_string<char>::size_type\xe2\x80\x99 {aka \xe2\x80\x98long unsigned int\xe2\x80\x99} [-Wsign-compare]\n   55 |             while(expr[i] != \',\' && i < expr.size()){\n      |                                     ~~^~~~~~~~~~~~~\nmain.cpp:65:21: error: \xe2\x80\x98input\xe2\x80\x99 was not declared in this scope; did you mean \xe2\x80\x98int\xe2\x80\x99?\n   65 |     size_t pStart = input.find("p=") + 2;\n      |                     ^~~~~\n      |                     int\n