?? b.c
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#include <stdio.h>#include <math.h>double D,M,A,J,jtime, jtimeaccellimit, jtimespeedlimit, jtimedistlimit, atime, dist, delta, a, b, c, r;double cubrt(double x) { return (exp(log(x)/3));}main(){ while (4 == scanf("%lf%lf%lf%lf",&D,&M,&A,&J)) { jtimeaccellimit = A/J; jtimespeedlimit = sqrt(M/J); jtimedistlimit = cubrt(D/2/J); jtime = jtimeaccellimit; if (jtimespeedlimit < jtime) jtime = jtimespeedlimit; if (jtimedistlimit < jtime) jtime = jtimedistlimit; atime = (M - J*pow(jtime,2))/A; a = 0.5*A; b = A*jtime + 0.5*J*pow(jtime,2); c = J * pow(jtime,3) - D/2; r = (-b + sqrt(b*b - 4*a*c))/2/a; if (r < atime) atime = r; dist = J * pow(jtime,3) + 0.5*J*pow(jtime,2)*atime + 0.5*A * pow(atime,2) + A * atime*jtime; printf("%0.1lf\n",4*jtime+2*atime+2*(D/2-dist)/M); }}?? 快捷鍵說明
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