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();
}