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33 lines
877 B
C++
33 lines
877 B
C++
#define _CRT_SECURE_NO_WARNINGS
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#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
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#include <bits/stdc++.h>
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using namespace std;
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#define CRP(t, x) const t &x
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#define OPL(t, x) bool operator<(CRP(t, x)) const
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#define FIL(x, v) memset(x, v, sizeof(x))
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#define CLR(x) FIL(x, 0)
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#define NE1(x) FIL(x, -1)
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#define INF(x) FIL(x, 0x3f)
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#ifndef _DEBUG
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#define _DEBUG 0
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#endif // !_DEBUG
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#define IFD if (_DEBUG)
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typedef long long ll, i64;
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const int N = 50050;
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int x[N], y[N];
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int main()
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{
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int n;
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scanf("%d", &n);
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for (int i = 1; i <= n; i++) scanf("%d%d", x + i, y + i);
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ll ans = 0;
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set<int> S;
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S.clear(), S.insert(0);
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for (int i = n; i; S.insert(x[i--]))
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ans += x[i] - *--S.lower_bound(x[i]);
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S.clear(), S.insert(0);
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for (int i = n; i; S.insert(y[i--]))
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ans += y[i] - *--S.lower_bound(y[i]);
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printf("%lld", ans);
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return 0;
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} |