题解 - 南师大算法竞赛域

端木俁 (房佳坤) LV 10 @ 2021-03-09 21:13:05

#include<bits/stdc++.h>
using namespace std;
vector <int> a;
int main()
{
    int t,n;cin>>t>>n;
    for(int i=t;i<=n;i++) a.push_back(i);
    int sum=0;
    for(int i=0;i<a.size();i++) sum+=a[i];
    cout<<sum;
    return 0;
}

0
魏然@苏州湾实验初级中学 (魏然同学) LV 10 @ 2021-02-27 14:41:48

#include <iostream>
using namespace std;

int Sum(int xmin,int xmax);

// Sum(1,100)= Sum(1,99)+100
// = Sum(1,98)+99 +100
// = Sum(1,1)+2.....+99 +100

int main()
{
int x,y;
cin>>x>>y;
cout<<Sum(x,y)<<endl;

return 0;
}
int Sum(int xmin,int xmax)
{

if(xmin==xmax)
return xmax;
int sum=Sum(xmin, xmax-1);
return xmax+sum;
}
-2
武子涵@石湖中学 (武子涵) LV 10 @ 2021-03-20 22:08:50

#include <iostream>
using namespace std;

int Sum(int xmin,int xmax);

// Sum(1,100)= Sum(1,99)+100
// = Sum(1,98)+99 +100
// = Sum(1,1)+2.....+99 +100

int main()
{
int x,y;
cin>>x>>y;
cout<<Sum(x,y)<<endl;

return 0;
}
int Sum(int xmin,int xmax)
{

if(xmin==xmax)
return xmax;
int sum=Sum(xmin, xmax-1);
return xmax+sum;
}