f0311.cpp

C++程序设计教程（第二版）源代码 钱能编著

//=====================================
// f0311.cpp
// 若干个向量按长短排序
//=====================================
#include<iostream>
#include<fstream>
#include<sstream>
#include<vector>
using namespace std;
//-------------------------------------
typedef vector<vector<int> > Mat;
Mat input();
void mySort(Mat& a);
void print(const Mat& a);
//-------------------------------------
int main(){
  Mat a = input();
  mySort(a);
  print(a);
}//------------------------------------
Mat input(){
  ifstream in("aaa.txt");
  Mat a;
  for(string s; getline(in, s); ){
    vector<int> b;
    istringstream sin(s);
    for(int ia; sin>>ia; )
      b.push_back(ia);
    a.push_back(b);
  }
  return a;
}//------------------------------------
void mySort(Mat& a){
  for(int pass=1; pass<a.size(); ++pass)
  for(int i=0; i<a.size()-pass; ++i)
    if(a[i+1].size()<a[i].size()) a[i].swap(a[i+1]);
}//------------------------------------
void print(const Mat& a){
  for(int i=0; i<a.size(); ++i){
    for(int j=0; j<a[i].size(); ++j)
      cout<<a[i][j]<<" ";
    cout<<endl;
  }
}//====================================