#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;
int main(void)
{
    fstream iofile("test.txt");
    vector<string> strs(20);
    int i=0;
    if(!iofile){
        cerr<<"open file failed"<<endl;
    }else{
        while(iofile>>strs[i++]);
    }
    for(int j=0;j<i-1;j++)
    {
        cout<<strs[j]<<endl;
    }
//    cout<<endl;
    cout<<"after sort"<<endl;
    cout<<*(strs.begin())<<endl;
    sort(strs.begin(),strs.begin()+i-1);
    cout<<"i:"<<i<<" "<<strs[1]<<endl;
    for(int j=0;j<i;j++)
        {
                cout<<strs[j]<<" ";
        }
    cout<<endl;
    return 0;
}

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "name": "(gdb) Launch",
            "type": "cppdbg",
            "request": "launch",
            "program": "${workspaceFolder}/build",
            "preLaunchTask": "build",
            "args": [],
            "stopAtEntry": false,
            "cwd": "${workspaceFolder}",
            "environment": [],
            "externalConsole": true,
            "MIMode": "gdb",
            "setupCommands": [
                {
                    "description": "Enable pretty-printing for gdb",
                    "text": "-enable-pretty-printing",
                    "ignoreFailures": true
                }
            ]
        }
    ]
}

{
    // See https://go.microsoft.com/fwlink/?LinkId=733558
    // for the documentation about the tasks.json format
    "version": "2.0.0",
    "tasks": [
        {
            "label": "build",
            "type": "shell",
            "command": "g++",
            "args": [
                "-g",
                "${workspaceFolder}/chapter01/1.7.cpp",
                "-o",
                "build"
            ]
        }
    ]
}