2015年第十三周oj：求三数的和

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1035: 求三数的和

Time Limit: 1 Sec Memory Limit: 128 MB
Submit: 580 Solved: 299
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Description

求以下三数的和,保留2位小数 1~a之和 1~b的平方和 1~c的倒数和

Input

a b c

Output

1+2+...+a + 1^2+2^2+...+b^2 + 1/1+1/2+...+1/c

Sample Input

100 50 10

Sample Output

47977.93

HINT

Source

freeproblemset

#include <iostream>#include<iomanip>using namespace std;long long fun1(long long n);long long fun2(long long n);double  fun3(int n);int main(){    long long a,b,c;    cin>>a>>b>>c;    cout << setiosflags(ios::fixed) << setprecision(2)<<fun1(a)+fun2(b)+fun3(c);    return 0;}long long fun1(long long n){    long long  sum=0;    for(long long i=1;i<=n;i++)    {       sum=sum+i;    }   return sum;}long long fun2(long long n){    long long  sum=0;    for(long long i=1;i<=n;i++)    {       sum=sum+i*i;    }   return sum;}double fun3(int n){    double  sum=0;    for(long long i=1;i<=n;i++)    {       sum=sum+1.0/i;    }   return sum;}

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