taotao09 @ 2022-07-19 18:53:12

#include<iostream>
using namespace std;
int main() 
{    
  int k,n=0; 
  float sn=0;
  cin>>k;
  while (sn<=k){
    n++;
    sn+=(float)1/n;
  }
  cout<<n;
  return 0; 
} 

by kevin3 @ 2022-07-20 11:35:38

@taotao09 float不行，要用double

by andyayy @ 2022-08-03 07:51:51

double!!!!

#include<bits/stdc++.h>
using namespace std;
int main(){
    double n,sum=0,s=2;
    cin>>n;
    while(n>0){
        n-=s;
        s*=0.98;
        sum++;
    }
    cout<<sum;
    return 0;
}

by gfoi_lyl @ 2022-08-06 16:01:51

include<bits/stdc++.h>```

using namespace std; int main(){ double a,b=0,i=1; cin>>a; for(;b<=a;i++)b+=1/i; cout<<i-1; }

by 004Tingting @ 2022-08-20 01:01:46

@andyayy 请问为什么要用double啊

by andyayy @ 2022-08-20 20:40:24

@004Tingting 布吉岛啊，反正用就对了

by Uesugi__Erii @ 2022-08-24 15:58:15

@004Tingting 因为是双精度，保留小数点后第2位