Auraus

input/code.cpp: In function 'int main()':
input/code.cpp:24:22: error: 'a' was not declared in this scope
         long c = abs(a-b)+1;
                      ^
input/code.cpp:24:24: error: 'b' was not declared in this scope
         long c = abs(a-b)+1;
                        ^

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

int main(){

    long n, m, k;
    cin >> n >> m >> k;

    long cnt = 0;

    vector<long> cs(m);

    for(int i = 0; i < m; i++){
        long a, b;
        cin >> a >> b;
        cs[i] = abs(a-b)+1;
    }
    sort(cs.begin(), cs.end());

    for(int i = 0; i < m; i++){
        long c = abs(a-b)+1;
        cout << "C:" << c << endl;
        if(k >= c){
            k-=c;
            cnt++;
        }
    }

    cout << cnt << endl;

}