ABC203(A-C)

A

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int a,b,c;
    cin>>a>>b>>c;
    if(a==b)cout<<c<<endl;
    else if(a==c)cout<<b<<endl;
    else if(b==c)cout<<a<<endl;
    else if(a!=b&&b!=c&&a!=c)cout<<0<<endl;
    return 0; 
}

B

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n,k;
    cin>>n>>k;
    cout<<(((1+k)*k)/2)*n+(((1+n)*n)/2)*k*100<<endl;
    return 0;

}

C

#include<bits/stdc++.h>
using namespace std;
int main(void) {
	int n;
	long long k;
	long long x, y;
	vector<pair<long long, long long> >a;
	cin >> n >> k;
	for (int i = 0; i < n; i++) {
		cin >> x >> y;
		a.push_back({ x,y }); 
	}
	sort(a.begin(), a.end());
	for (int i = 0; i < n; i++) {
		if (a[i].first > k)break;
		k += a[i].second;
	}
	cout << k << endl;
	return 0;
}