如题，开启o2优化后提示第一行第一列是p，但是我自己用vs测试没有这种问题，此外不开反而AC了

#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<cstdio>
#include<cstring>
#include<stdlib.h>
using namespace std;
char a[60][5000]={0}, len[5000],temp[5000];
int main() {
	int i,jw=0,n,j=0,t;
	a[1][0] = 1;
	len[1] = 1;
	for (i = 2; i <= 50; i++) {
		jw = 0;
		j = 4999;
		while (j >= 0) {
			if (a[i-1][j] != 0) {
				break;
			}
			j--;
		}
		len[i-1] = j+1;
		j = 0;
		while (j<len[i-1] + 2) {
			t = a[i - 1][j] * i+jw;
			jw = t / 10;
			a[i][j] = t % 10;
			j++;
		}
		if (jw) {
			t = a[i - 1][j] * i + jw;
			jw = t / 10;
			a[i][j] = t % 10;
		}
	}
	j = 4999;
	while (a[50][j] == 0) {
		j--;
	}
	len[50] = j;
	scanf("%d", &n);
	temp[0] = 1;
	jw = 0;
	int p;
	for (i = 2; i <= n; i++) {
		for (j = 0; j <= len[i];j++) {
			t = temp[j] + a[i][j]+jw;
			jw = t / 10;
			temp[j] = t % 10;
		}
		while (jw) {
			t = temp[j] + a[i][j] + jw;
			jw = t / 10;
			temp[j] = t % 10;
			j++;
		}
		
	}
	if (n != 1) {
		p = 5999;

		while (temp[p] == 0) {
			p--;
		}
		for (int k = p; k >= 0; k--) {
			cout << (char)(temp[k] + 48);
		}
	}
	else {
		cout << 1;
	}
}