Submission #1688877

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Source Code Expand

#include<bits/stdc++.h>
#define vi vector<int>
#define vvi vector<vector<int> >
#define vl vector<ll>
#define vvl vector<vector<ll>>
#define vb vector<bool>
#define vc vector<char>
#define vs vector<string>
using ll = long long;
using ld =long double;
#define int ll
#define INF 1e9
#define EPS 0.0000000001
#define rep(i,n) for(int i=0;i<n;i++)
#define loop(i,s,n) for(int i=s;i<n;i++)
#define all(in) in.begin(), in.end()
template<class T, class S> void cmin(T &a, const S &b) { if (a > b)a = b; }
template<class T, class S> void cmax(T &a, const S &b) { if (a < b)a = b; }
#define MAX 9999999
using namespace std;
typedef pair<int, int> pii;
typedef pair<int,pii> piii;
signed main(){
    int n,k; cin>>n>>k;
    map<int,int>mp;
    vector<int>tiya;
    rep(i,n){
        int num,cnt; cin>>num>>cnt;
        if(mp[num]==0){
            tiya.push_back(num);
        }
        mp[num]+=cnt;
    }
    sort(all(tiya));
    rep(i,tiya.size()){
        k-=mp[tiya[i]];
        if(k<=0){cout<<tiya[i]<<endl; return 0;}
    }
}

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