Gym - 101606L Lizard Lounge——LIS

按照先极角后距离的顺序排序，然后对每一个序列求一遍LIS， 累加起来就是结果

#include <cstdio>
#include <cstring>
#include <iostream>
#include <algorithm>
#include <vector>
#include <cmath>
using namespace std;
const int maxn = 1e6 + 10;
const int INF = 0x3f3f3f3f;
const double eps = 1e-8;
int dcmp(double x) {
    if (fabs(x) < eps) return 0;
    return x > 0 ? 1 : -1;
}
struct Node {
    int x, y, h;
    double angle;
    double dis;
    bool operator < (const Node &atr) const {
        if (dcmp(angle - atr.angle) != 0) return angle < atr.angle;
        return dis < atr.dis;
    }
}node[maxn];
vector<int> v[maxn];
int dp[maxn];
int cx, cy, n;
int main() {
    scanf("%d %d", &cx, &cy);
    scanf("%d", &n);
    for (int i = 1; i <= n; i++) {
        scanf("%d %d %d", &node[i].x, &node[i].y, &node[i].h);
        node[i].x -= cx, node[i].y -= cy;
        node[i].angle = atan2(node[i].y, node[i].x);
        node[i].dis = sqrt(1.0*node[i].x*node[i].x+1.0*node[i].y*node[i].y);
    }
    sort(node+1, node+1+n);
    int cnt = 0;
    for (int i = 1; i <= n; i++) v[i].clear();
    v[++cnt].push_back(node[1].h);
    for (int i = 2; i <= n; i++) {
        if (dcmp(node[i].angle - node[i-1].angle) != 0) ++cnt;
        v[cnt].push_back(node[i].h);
    }
    int ans = 0;
    for (int i = 1; i <= cnt; i++) {
        int len = v[i].size();
        for (int j = 0; j < len; j++) dp[j] = INF;
        for (int j = 0; j < len; j++) *lower_bound(dp, dp+len, v[i][j]) = v[i][j];
        ans += lower_bound(dp, dp + len, INF) - dp;
    }
    printf("%dn", ans);
    return 0;
}

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