NOIP 2010 普及组 导弹拦截

#include using namespace std;const int N = 1e5 + 10;int n;struct info {int d1, d2, maxx;}a[N];bool cmp(info i, info j) {return i.d1 < j.d1;}int main() {int x1, y1, x2, y2;cin >> x1 >> y1 >> x2 >> y2 >> n;for (int i = 1; i <= n; i ++) {int x, y;cin >> x >> y;a[i].d1 = (x - x1) * (x - x1) + (y - y1) * (y - y1);a[i].d2 = (x - x2) * (x - x2) + (y - y2) * (y - y2);}sort(a + 1, a + 1 + n, cmp);for (int i = n; i >= 1; i --) {//第i~第n颗导弹到系统2的最大距离 a[i].maxx = max(a[i].d2, a[i + 1].maxx);}int minn = 1e9;for (int i = 1; i <= n; i ++) {//系统1拦截最近的i颗导弹，系统2拦截第i+1~第n颗导弹 minn = min(minn, a[i].d1 + a[i + 1].maxx);}cout << minn;return 0;}