代码

#include <bits/stdc++.h>

using namespace std;

#define x first
#define y second
#define mp make_pair
#define pb emplace_back
#define upb upper_bound
#define lowb lower_bound
#define gmx(a,b) (a=max(a,b))
#define gmn(a,b) (a=min(a,b))
#define siz(x) ((int)x.size())
#define all(x) begin(x),end(x)
#define fil(a,x) memset(a,x,sizeof(a))
#define ppcnt(x) __builtin_popcount(x)
#define rep(i,a,b) for(int i=(a);i<=(b);i++)
#define per(i,a,b) for(int i=(a);i>=(b);i--)

/*
*/

typedef long long LL;
typedef vector<int> VI;
typedef pair<int,int> PII;
typedef unsigned long long ull;
typedef set<int>::iterator iter;
const int N=3e8+10;

int n=3e8;
unsigned a[N];

int main()
{
	ios::sync_with_stdio(0),cin.tie(0);
#ifdef WXQWQ
	freopen("biao.out","w",stdout);
#endif

	mt19937 rnd(20080819);
	rep(i,1,n) a[i]=rnd();
	double st=clock();
	rep(i,1,n) a[i+1]+=a[i];
	cout<<a[n]<<"\n";

	cerr<<(clock()-st)*1.0/CLOCKS_PER_SEC<<"\n";
	return 0;
}

评测结果