修改了一下不能存东西，不能打开东西的bug

#include<bits/stdc++.h>
#include<windows.h>
using namespace std;
double mem=10737418240;
map<string,string> jishiben;
string mulu="朴同学给你的一封信.memo\n";
int cntnote=1;
void start() {
	srand(time(0));
	for(int i=1; i<=100; i++) {
		system("cls");
		cout<<"\n\n\n";
		cout<<"       Park_01\n\n";
		cout<<"    正在启动中...\n\n";
		cout<<i<<"%";
		for(int j=1; j<=i; j++) {
			cout<<"▌";
		}
		Sleep(rand()%100+1);
	}
	Sleep(2000);
}
double calc() {
	system("cls");
	long long a,c;
	char b;
	cout<<"加减乘除，乘方运算\n";
	cout<<"输入算式（只支持一个符号）:";
	cin>>a>>b>>c;
	if(b=='+') return a+c;
	else if(b=='-') return a-c;
	else if(b=='*') return a*c;
	else if(b=='/') {
		if(c==0) {
			cout<<" Error : Diveded by ";
			return 0;
		} else return a/c;
	} 
	else if(b=='^') return pow(a,c);
	else cout<<"符号错误\n";
}
void note() {
	while(1) {
		system("cls");
		if(mem<=1024)
			cout<<"当前剩余内存:"<<mem<<"B\n";
		else if(mem<=1048576)
			cout<<"当前剩余内存:"<<mem/1024 <<"KB\n";
		else if(mem<=1073741824)
			cout<<"当前剩余内存:"<<mem/1048576<<"MB\n";
		else cout<<"当前剩余内存:"<<mem/1073741824<<"GB\n";
		if(cntnote==0) {
			cout<<"当前暂未记录\n";
		} else {
			cout<<mulu<<"\n";
		}
		cout<<"1.新建 2.打开 3.退出\n";
		int j;
		string temp;
		cin>>j;
		getline(cin,temp);
		system("cls");
		if(j==1) {
			string biaoti;
			cout<<"输入文件名:";
            getline(cin,biaoti);
			biaoti+=".memo";
			mulu+=biaoti;
			mulu+="\n";
			cout<<"请输入你想输入的内容，回车结束:"<<"\n"; 
			getline(cin,jishiben[biaoti]);
			cout<<"正在保存...";
			Sleep(1000);
			mem-=jishiben[biaoti].size();
            cntnote++;
		}
		if(j==2) {
			cout<<"请输入文件名:";
			string bt;
			cin>>bt;
			if(mulu.find(bt)!=-1) {
				cout<<jishiben[bt]<<"\n";
			} else cout<<"文件未找到\n",Sleep(1000);
			system("pause");
		}
		if(j==3) return;
	}
}
void man() {
	jishiben["朴同学给你的一封信.memo"]="你好，我是朴同学。欢迎使用Park_01,祝你每天开心。Park_02已经在制作，希望你给我点个赞!" ;
	while(1) {
		cout<<"\n\n\n       这里是Park_01\n";
		cout<<"        作者:朴同学\n";
		cout<<"        你要做什么呢?\n";
		cout<<"      1.计算器 2.记事本\n";
		int n;
		cin>>n;
		if(n==1) cout<<calc();
		if(n==2) note();
	}
}
int main() {
	start();
	system("cls");
	man();
}