通用代碼模板（開頭）

代碼開頭
define還待完善
讀入，輸出優化未判負數

#pragma GCC optimize(3)
#include<bits/stdc++.h>
using namespace std;
#define maxn 100020
#define rep(i,l,r) for(register int i = l ; i <= r ; i++)
#define repd(i,r,l) for(register int i = r ; i >= l ; i--)
#define inf 1e8


typedef long long ll;
inline int read(){
    register int num = 0;
    register char ch = getchar();
    while ( ch > '9' || ch < '0' ) ch = getchar();
    while ( ch <= '9' && ch >= '0' ) num = num * 10 + ch - '0' , ch = getchar();
    return num;
}
int num[10];
inline void write(int x){
    register int cnt = 0;
    if ( !x ){ printf("0"); return; } //一定要特判0！！！
    while ( x ) num[++cnt] = x % 10 , x /= 10;
    while ( cnt ) putchar(num[cnt--] + '0');
}
int n,m;