数的统计c++

解题思路:

注意事项:

参考代码:

#include<iostream>

#include<cstdio>

#include<algorithm>

#include<cmath>

#include<cstring>

#include<vector>

#include<utility>

#include<map>

using namespace std;

int n,x;

int main(){

cin>>n;

map<int,int>mp;

vector<int>v;

while(n--){

scanf("%d",&x);

if(!mp[x]){

v.push_back(x);

}

mp[x]++;

}

sort(v.begin(),v.end());

for(vector<int>::iterator it=v.begin();it!=v.end();it++){

printf("%d %d\n",*it,mp[*it]);

}

return 0;

}