L2 -3 清点代码库

代码

#include<iostream>
#include<map>
#include<algorithm>
#include<vector>
using namespace std;
map<vector<int>,int>mp;
vector<int>temp;
int main(){
    int n, m;
    cin >> n >> m;
    temp.resize(m);
    for(int i = 1; i <= n; i++){
        for(int j = 0; j < m; j++) cin >> temp[j];
        mp[temp]++;
    }
    multimap<int,vector<int>,greater<int>>mpp;
    int cnt = 0;
    for(auto it : mp){
        mpp.insert({it.second,it.first});
        cnt++;
    }
    cout << cnt << endl;
    for(auto it : mpp){
        cout << it.first;
        for(int i = 0; i < m;i++)
            cout <<" " << it.second[i];
        cout << endl;
    }
    return 0;
}