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 fast cin.tie(0)->sync_with_stdio(0);
#define int long long
#define inf ((int)1e18)
using namespace std;
int32_t main(){
fast
int n;
cin >> n;
int need = 0, ans = 0;
for(int i = 0; i < n; i++) {
int a, b;
cin >> a >> b;
int ai = b - a;
need += ai;
ans += abs(need);
}
cout << ans << "\n";
}
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