mirror of
https://git.sb/baoshuo/OI-codes.git
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85 lines
2.2 KiB
C++
85 lines
2.2 KiB
C++
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#include <iostream>
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#include <algorithm>
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#include <cmath>
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#include <cstring>
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#include <iterator>
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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 = 2005,
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M = 105;
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int n, k, m, a[M], b[M], t[M], max, ans;
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// 访问过最左端的房子为 l
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// 最右端的房子为 r
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// 时间已经过了 k 秒
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// 目前正在 左(0) / 右(1) 端
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int f[M][M][N][2];
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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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memset(f, 0xc0, sizeof(f));
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cin >> n >> k >> m;
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for (int i = 1; i <= m; i++) {
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cin >> a[i] >> b[i] >> t[i];
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max = std::max(max, t[i]);
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}
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int x = std::distance(a, std::lower_bound(a + 1, a + 1 + m, k)),
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y = std::distance(a, std::upper_bound(a + 1, a + 1 + m, k)) - 1;
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if (a[x] == k) {
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f[x][x][0][0]
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= f[x][x][0][1]
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= (std::abs(a[x] - k) < t[x]) * b[x];
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} else { // 起始点没有宝可梦
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f[x][x][std::abs(a[x] - k)][0]
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= f[x][x][std::abs(a[x] - k)][1]
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= (std::abs(a[x] - k) < t[x]) * b[x];
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f[y][y][std::abs(a[y] - k)][0]
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= f[y][y][std::abs(a[y] - k)][1]
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= (std::abs(a[y] - k) < t[y]) * b[y];
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}
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for (int len = 2; len <= m; len++) {
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for (int l = 1, r = l + len - 1; r <= m; l++, r++) {
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for (int k = a[r] - a[l]; k <= max; k++) {
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f[l][r][k][0] = std::max({
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f[l][r][k][0],
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f[l + 1][r][k - (a[l + 1] - a[l])][0] + (k < t[l]) * b[l],
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f[l + 1][r][k - (a[r] - a[l])][1] + (k < t[l]) * b[l],
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});
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f[l][r][k][1] = std::max({
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f[l][r][k][1],
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f[l][r - 1][k - (a[r] - a[r - 1])][1] + (k < t[r]) * b[r],
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f[l][r - 1][k - (a[r] - a[l])][0] + (k < t[r]) * b[r],
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});
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}
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}
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}
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for (int l = 1; l <= m; l++) {
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for (int r = l; r <= m; r++) {
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for (int k = 0; k <= max; k++) {
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ans = std::max({
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ans,
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f[l][r][k][0],
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f[l][r][k][1],
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});
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}
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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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