```cpp
#include<iostream>
#include<cstdlib>
#include<cstdio>
using namespace std; int main() { double a,s=0; scanf("%lf",&a); int i=0,j; while(s<=a) { s=s+0.98i2; i++; } printf("%d",i); return 0;
}
```
by Neworld1111 @ 2018-02-20 10:55:34
```
s=s+0.98i2; i++;
```
这是什么意思
by TomLovesRita @ 2018-02-20 11:08:05
应该先将距离加上，再乘0.98
by TomLovesRita @ 2018-02-20 11:12:10