This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define ll long long
#define endl "\n"
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
void solve()
{
ll n;
cin >> n;
ll ans = 0, cur = 0;
while (n--)
{
ll a, b;
cin >> a >> b;
cur += a - b;
ans += abs(cur);
}
cout << ans << endl;
}
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
ll t = 1;
// precomp();
// cin >> t;
for (ll cs = 1; cs <= t; cs++)
solve();
cerr << "\nTime elapsed: " << clock() * 1000.0 / CLOCKS_PER_SEC << " ms\n";
}
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