数组初始化 memset fill

 #include <cstdio>
 #include <cstdlib>
 #include <cmath>
 #include <cstring>
 #include <time.h>
 #include <string>
 #include <set>
 #include <map>
 #include <list>
 #include <stack>
 #include <queue>
 #include <vector>
 #include <bitset>
 #include <ext/rope>
 #include <algorithm>
 #include <iostream>
 using namespace std;
 #define ll long long
 #define minv 1e-6
 #define inf 1e9
 #define pi 3.1415926536
 #define nl 2.7182818284
 const ll mod=1e9+;//
 const int maxn=1e2+;

 int a[maxn],b[maxn];

 char c[maxn];

 int main()
 {
     memset(a,,sizeof(a));
     fill(b,b+,inf);
     fill(c,c+,'a');

     cout<<a[]<<endl;
     cout<<b[]<<endl;
     cout<<c[]<<endl;
     return ;
 }