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>
using namespace std;
int32_t main()
{
cin.tie(0)->sync_with_stdio(0);
int n;
cin >> n;
vector<int> a(n + 1), b(n + 1);
for(int i = 1; i <= n; i++) {
cin >> a[i] >> b[i];
}
auto ter = clock();
while(clock() - ter <= 0.8 * CLOCKS_PER_SEC) {
for(int i = 1; i <= n; i++) {
if(a[i] > b[i]) {
int take = (a[i] - b[i] + 1) / 2;
a[i] -= 2 * take;
a[i % n + 1] += take;
}
}
}
int good = 1;
for(int i = 1; i <= n; i++) {
good &= (a[i] == b[i]);
}
cout << (good ? "Yes" : "No") << '\n';
}
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