高斯的题解|我的题解

什么，我竟然没有高斯聪明，瞎说什么大实话

高斯的题解

#include<bits/stdc++.h>
#define ll long long                                                        //防伪标识
#define MAXN 1005
#define maxn 10005
#define MAXM 10000
#define maxm 1000005
#define Y1 "YES"<<endl
#define N1 "NO"<<endl
#define Y2 "yes"<<endl
#define N2 "no"<<endl
#define Y3 "Yes"<<endl
#define N3 "No"<<endl
using namespace std;
ll t;
int main(){
	cin>>t;
	cout<<(1+t)*t/2;
	return 0;
}

我的题解

#include<bits/stdc++.h>
#define ll long long                                                        //防伪标识
#define MAXN 1005
#define maxn 10005
#define MAXM 10000
#define maxm 1000005
#define Y1 "YES"<<endl
#define N1 "NO"<<endl
#define Y2 "yes"<<endl
#define N2 "no"<<endl
#define Y3 "Yes"<<endl
#define N3 "No"<<endl
using namespace std;
ll t;
ll sum;
int main(){
	cin>>t;
	for(int i = 1;i<=t;i++)
        sum+=i;
    cout<<sum;
	return 0;
}