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3379. [Usaco2004 Open]Turning in Homework 交作业

https://hydro.ac/d/bzoj/record/6322ae00bdf9bc31d1606239
This commit is contained in:
Baoshuo Ren 2022-09-15 12:46:17 +08:00
parent 320af422bd
commit 6b06184d03
Signed by: baoshuo
GPG Key ID: 00CB9680AB29F51A
23 changed files with 120 additions and 0 deletions

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#include <iostream>
#include <algorithm>
#include <cmath>
#include <cstring>
#include <limits>
#include <utility>
using std::cin;
using std::cout;
const char endl = '\n';
const int N = 1005;
int c, h, b, f[N][N][2], ans = std::numeric_limits<int>::max();
std::pair<int, int> a[N];
int main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
memset(f, 0x3f, sizeof(f));
cin >> c >> h >> b;
for (int i = 1; i <= c; i++) {
cin >> a[i].first >> a[i].second;
}
std::sort(a + 1, a + 1 + c);
f[0][c][0] = f[0][c][1] = 0;
for (int i = 1; i <= c; i++) {
for (int j = c; j >= i; j--) {
f[i][j][0] = std::min({
std::max(f[i - 1][j][0] + a[i].first - a[i - 1].first, a[i].second),
std::max(f[i][j + 1][1] + a[j + 1].first - a[i].first, a[i].second),
});
f[i][j][1] = std::min({
std::max(f[i - 1][j][0] + a[j].first - a[i - 1].first, a[j].second),
std::max(f[i][j + 1][1] + a[j + 1].first - a[j].first, a[j].second),
});
}
}
for (int i = 1; i <= c; i++) {
ans = std::min(ans, std::min(f[i][i][0], f[i][i][1]) + std::abs(b - a[i].first));
}
cout << ans << endl;
return 0;
}

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