algorithmStudy/14467.cpp at master · judy5050/algorithmStudy · GitHub

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//
//  14467.cpp
//  algo
//
//  Created by 박효정 on 2021/08/13.
//

#include <iostream>
#include <vector>
#include <algorithm>


using namespace std;

int main(){


    cin.tie(0);
    cout.tie(0);
    std::ios::sync_with_stdio(false);


    int n;
    cin>>n;
    vector<int>v[10];

    int a,b;
    for(int i=0;i<n;i++){
        cin>>a>>b;
        v[a-1].push_back(b);
    }

    int cnt=0;
    for(int i=0;i<10;i++){
        if(v[i].size()!=0){
            for(int j=0;j<v[i].size()-1;j++){
                if(j+1<v[i].size()){
                    if(v[i][j]!=v[i][j+1]){
                        cnt++;
                    }
                }

        }


        }


    }

    cout<<cnt<<"\n";


    return  0;
}