比赛会用到的2种输入输出

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文件的输入输出

freopen("a.in", "r", stdin);//输出文件 a.in
freopen("a.out", "w", stdout);//输出文件 a.out

快读 & 快写

inline void read(int &x){
	int s = 0, w = 1; 
	char ch = getchar();
	while(ch < '0' || ch > '9'){ 
    	if(ch == '-')	w = -1; 
    	ch = getchar(); 
	}
	while(ch >= '0' && ch <= '9') 
    	s = s * 10 + ch - '0', ch = getchar();
	x = s * w;
	return ;
}

inline void write(int x)  {
    int num = 0; 
	char c[15];
    while(x) c[++num] = (x%10)+48, x /= 10;
    while(num) putchar(c[num--]);
    putchar('\n'); 
}