Watering Grass
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题意:
给出草坪的长宽和各洒水器的射程,求最少的放置数。
思路:
由于要填满,所以洒水器的射程只能取正方形。
在确定的起点范围内取射程最大,然后调整起点。
代码:
#include<cstdio>#include<algorithm>#include<cmath>using namespace std;double l, w, p, r;double cal() {return sqrt(r*r-w*w/4.0);}int n;struct spr {double lef, rig;bool operator < (const spr& c) const {return lef < c.lef;}}s[10005];int main() {while(scanf("%d%lf%lf", &n, &l, &w)!=EOF) {int num = 0;for(int i=0; i<n; i++) {scanf("%lf%lf", &p, &r);if(r <= w/2) continue;double t = cal();s[num].lef = p - t;s[num].rig = p + t;num++;}sort(s, s+num);double le = 0, ri = 0;int flag = 0, ans = 0;if(s[0].lef <= 0) {int i = 0;while(i < num) {int j = i;while(j<num && s[j].lef <= le) {if(ri < s[j].rig) ri = s[j].rig;j++;}if(j == i) break;i = j;le = ri;ans++;if(ri >= l) {flag = 1;break;}}}if(flag) printf("%d\n", ans);else printf("-1\n");}return 0;}
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