萌新第一次写

#include "testlib.h"
#include <string> 

int main(int argc, char* argv[]) {
    registerTestlibCmd(argc, argv);
    string pans = ouf.readToken();
    string jans = ans.readToken();
	
    if (pans.find(jans)>0)
        quitf(_ok, "The answer is correct.");
    else
        quitf(_wa, "The answer is wrong: you didn't answered the right point.", jans, pans);
}

显示pans未定义，string的库好像就是啊，是什么问题呢QAQ