|
|
#include <iostream>
|
|
|
#include <algorithm>
|
|
|
#include <cmath>
|
|
|
#include <cstring>
|
|
|
#include <vector>
|
|
|
|
|
|
using namespace std;
|
|
|
typedef long long LL;
|
|
|
const int N = 10010;
|
|
|
|
|
|
struct Seg {
|
|
|
LL x, y1, y2, c;
|
|
|
bool operator<(const Seg &t) const {
|
|
|
if (x == t.x) return c < t.c; //-1在前，1在后，先处理出边再处理入边
|
|
|
return x < t.x;
|
|
|
}
|
|
|
} seg[N << 1];
|
|
|
|
|
|
struct Node {
|
|
|
int l, r;
|
|
|
int maxc, add;
|
|
|
} tr[N << 3];
|
|
|
|
|
|
int n, w, h;
|
|
|
vector<LL> ys;
|
|
|
|
|
|
void pushup(int u) {
|
|
|
tr[u].maxc = max(tr[u << 1].maxc, tr[u << 1 | 1].maxc);
|
|
|
}
|
|
|
|
|
|
void build(int u, int l, int r) {
|
|
|
tr[u] = {l, r, 0, 0};
|
|
|
if (l == r) return;
|
|
|
int mid = (l + r) >> 1;
|
|
|
build(u << 1, l, mid);
|
|
|
build(u << 1 | 1, mid + 1, r);
|
|
|
}
|
|
|
|
|
|
void pushdown(int u) {
|
|
|
if (tr[u].add) {
|
|
|
tr[u << 1].add += tr[u].add;
|
|
|
tr[u << 1].maxc += tr[u].add;
|
|
|
tr[u << 1 | 1].add += tr[u].add;
|
|
|
tr[u << 1 | 1].maxc = tr[u << 1 | 1].maxc + tr[u].add;
|
|
|
tr[u].add = 0;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
void modify(int u, int l, int r, int c) {
|
|
|
if (l <= tr[u].l && tr[u].r <= r) {
|
|
|
tr[u].maxc += c;
|
|
|
tr[u].add += c;
|
|
|
return;
|
|
|
}
|
|
|
|
|
|
pushdown(u);
|
|
|
int mid = tr[u].l + tr[u].r >> 1;
|
|
|
if (l <= mid) modify(u << 1, l, r, c);
|
|
|
if (r > mid) modify(u << 1 | 1, l, r, c);
|
|
|
|
|
|
pushup(u);
|
|
|
}
|
|
|
|
|
|
int find(LL x) {
|
|
|
return lower_bound(ys.begin(), ys.end(), x) - ys.begin();
|
|
|
}
|
|
|
|
|
|
int main() {
|
|
|
//加快读入
|
|
|
cin.tie(0), ios::sync_with_stdio(false);
|
|
|
|
|
|
while (cin >> n >> w >> h) {
|
|
|
for (int i = 1; i <= n; i++) {
|
|
|
LL x, y;
|
|
|
int c;
|
|
|
cin >> x >> y >> c;
|
|
|
//区别在这里！
|
|
|
/*
|
|
|
需配合：
|
|
|
if (x == t.x) return c < t.c; //-1在前，1在后，先处理出边再处理入边
|
|
|
*/
|
|
|
seg[2 * i - 1] = {x, y, y + h - 1, c};
|
|
|
seg[2 * i] = {x + w, y, y + h - 1, -c};
|
|
|
ys.push_back(y), ys.push_back(y + h - 1);
|
|
|
}
|
|
|
|
|
|
sort(ys.begin(), ys.end());
|
|
|
ys.erase(unique(ys.begin(), ys.end()), ys.end());
|
|
|
|
|
|
sort(seg + 1, seg + 1 + 2 * n);
|
|
|
|
|
|
build(1, 0, ys.size() - 1);
|
|
|
|
|
|
int res = 0;
|
|
|
for (int i = 1; i <= 2 * n; i++) {
|
|
|
res = max(res, tr[1].maxc);
|
|
|
modify(1, find(seg[i].y1), find(seg[i].y2), seg[i].c);
|
|
|
}
|
|
|
printf("%d\n", res);
|
|
|
}
|
|
|
return 0;
|
|
|
} |
