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20 lines
684 B
C++
20 lines
684 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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int a[100100][2][2];
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int dis(int p[2], int q[2]) { return abs(p[0] - q[0]) + abs(p[1] - q[1]); }
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int main()
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{
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int n, m;
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scanf("%d%d", &n, &m);
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for (int i = 0; i < n; i++)
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scanf("%d%d%d%d", &a[i][0][0], &a[i][0][1], &a[i][1][0], &a[i][1][1]);
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long long ans = dis(a[n - 1][0], a[n - 1][1]);
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for (int i = 1; i < n; i++)
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ans += min(dis(a[i - 1][0], a[i][0]) + dis(a[i - 1][1], a[i][1]),
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dis(a[i - 1][0], a[i][1]) + dis(a[i - 1][1], a[i][0]));
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printf("%lld", ans);
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return 0;
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}
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