https://blog.csdn.net/xs18952904/article/details/75195412
memset只能初始化成为0或者-1,其他都要用fill来完成.
#include<bits/stdc++.h>
using namespace std;
const int INF = 1e9;
int main()
{
int a[100][100];
fill(a[0], a[0] + 100 * 100,INF);
//memset(a, 5, sizeof(a));
printf("%d", a[50][50]);
}