HDU 2268 How To Use The Car (数学题)
2014-09-22 23:30
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题目
//做起来很艰辛,总结起来很简单。。。
//注意步行速度可能比车的速度快。。。。
//推公式要仔细,,,,
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//做起来很艰辛,总结起来很简单。。。
//注意步行速度可能比车的速度快。。。。
//推公式要仔细,,,,
//一道对我来说很搞脑子的数学题,,,,, //车先送第一个人上路,第二个人步行;中途第一个人下车步行,车回去接第二个人直接到终点 //L:第一个人步行的路程; //T:总时间 //(c-L)*a/b+L+((L/a-L/b)/2)*(a+b)=c -->> L=2*a*c/(3*a+b) //T=(c-L)/b+L/a //坑啊,要比较车速快还是步行快!!!!采取不同方案。。。。。 //中途推出来了(案例顺利通过),交上去却wa,还以为精度问题或是超出了int,改了半天才发现推错了,,笨死拉,,, //tmd,推数学公式真要仔细啊,一不小心就会出错。。。 #include<stdio.h> #include<string.h> #include<algorithm> using namespace std; int main() { double time,a,b,c; while(scanf("%lf%lf%lf",&a,&b,&c)!=EOF) { if(a>=b)time=c*1.0/a; else { double L=2*a*c/(3*a+b); time=(c-L)/b+L/a; } printf("%.3lf\n",time); } return 0; }
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