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33 lines
554 B
C++
33 lines
554 B
C++
#include <iostream>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 5e4 + 5;
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int n;
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long long ans;
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std::pair<int, int> p[N];
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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cin >> n;
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for (int i = 1; i <= n; i++) {
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cin >> p[i].first >> p[i].second;
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}
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for (int i = 1; i <= n; i++) {
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for (int j = 1; j < i; j++) {
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ans += 1ll * std::max(p[i].first, p[j].first) * std::abs(p[i].second - p[j].second);
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}
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}
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cout << ans << endl;
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return 0;
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}
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