No.246 質問と回答 on Node.js Generator | Codetter（こーどったー）

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//https://yukicoder.me/submissions/292157 を移植
const rl=require("readline").createInterface(process.stdin,process.stdout);
const g=function*(){
    var numMin=1;
    var numMax=1000000001;
    for(;;){
        var chkNum=0|(numMin+numMax)/2;
        console.log("? %d",chkNum);
        if((yield rl.once("line",s=>g.next(s)))=="1") numMin=chkNum; else numMax=chkNum;
        if(numMin==numMax-1){
            console.log("! %d",numMin);
            break;
        }
    }
    process.exit();
}();
g.next();
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