hdu 3940

#include<stdio.h>

#include<math.h>

#include<string.h>

double first(double vx,double vy,double h) {

    return vx*(vy+sqrt(vy*vy+19.6*h))/9.8;

}

double nowh(double h,double vy,double t) {

    return h+vy*t-4.9*t*t;

}

int main() {

    double k,h,vx,vy,v1,v2,v3,h1,h2,t;

    char s[30];

    while(scanf("%lf%s",&h,s)!=EOF) {

        if(strcmp(s,"Red")==0) {

            scanf("%lf%lf",&vx,&vy);

            printf("%.3f\n",first(vx,vy,h));

            continue;

        }

            if(strcmp(s,"Yellow")==0) {

            scanf("%lf%lf%lf",&vx,&vy,&t);

          if(first(vx,vy,h)<vx*t) {

             printf("%.3f\n",first(vx,vy,h));

             continue;

    }

        h1=nowh(h,vy,t);

        h2=vx*t;

        vy=vy-9.8*t;

        printf("%.3f\n",h2+first(2*vx,2*vy,h1));

        continue;

            }

            if(strcmp(s,"Blue")==0){

                scanf("%lf%lf%lf%lf%lf%lf",&vx,&vy,&t,&v1,&v2,&v3);

                if(first(vx,vy,h)<vx*t) {

                printf("%.3f\n",first(vx,vy,h));

                continue;

                }

                 h1=nowh(h,vy,t);

                 h2=vx*t;

                 vy=vy-9.8*t;

    printf("%.3f %.3f %.3f\n",h2+first(v1,vy,h1),h2+first(v2,vy,h1),h2+first(v3,vy,h1));

            }

    }

    return 0;

}

//一个博客地址帮助你理解http://blog.sina.com.cn/s/blog_c0519a300101dr2w.html

巴特西

hdu 3940

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