放一点常用快速读入的板子在这里

int 型整数变量快读

int read() {
    int x = 0, f = 1;
    char c = getchar();
    while (c < '0' || c>'9') { if (c == '-') f = -1; c = getchar(); }
    while (c >= '0' && c <= '9') x = x * 10 + c - '0', c = getchar();
    return x * f;
}

快输

void write(int x) {
	 if(x==0){
	 	putchar('0');return;
	 }
     if(x<0) putchar('-'),x=-x;
     if(x>9) write(x/10);
     putchar(x%10+'0');
}

字符串快读

inline string read(){
	char ch=getchar();
	string st1="";
	while (!((ch>='a')&&(ch<='z')))
	  ch=getchar();
	while ((ch>='a')&&(ch<='z')) 
	  st1+=ch,ch=getchar();
	return st1;
}

double型快速读入

inline double DoubleRead(){
    long long s = 0, w = 1, k = 0, n = 0, m = 0;
    char ch = getchar(); 
    while(ch < '0' || ch > '9'){
        if(ch == '-') w = -1;
        ch = getchar();
    }
    while((ch >= '0' && ch <= '9') || ch == '.'){
        if (ch == '.')
            n = 1;
        else if (n == 0)
            s = s * 10 + ch - '0';
           else k = k * 10 + ch - '0', m++;
        ch = getchar();
    }
    return (pow(0.1, m) * k + s) * w;
}

据说会更快的快读

namespace FAST_IO {
#define IN_LEN 250000
#define OUT_LEN 250000
    //以上两个值无需修改
    inline char Getchar() {
        static char buf[IN_LEN], *l = buf, *r = buf;
        if (l == r) r = (l = buf) + fread(buf, 1, IN_LEN, stdin);
        return (l == r) ? EOF : *l++;
    }
    char obuf[OUT_LEN], *ooh = obuf;
    inline void Putchar(char c) {
        if (ooh == obuf + OUT_LEN) fwrite(obuf, 1, OUT_LEN, stdout), ooh = obuf;
        *ooh++ = c;
    }
    inline ll rd() {
        ll x = 0; int ch = Getchar(); bool f = 1;
        while (!isdigit(ch) && (ch != '-') && (ch != EOF)) ch = Getchar();
        if (ch == '-') { f = 0; ch = Getchar(); }
        while (isdigit(ch)) { x = (x << 1) + (x << 3) + ch - '0'; ch = Getchar(); }
        return f ? x : -x;
    }
    void write(ll x) { if (x >= 10) write(x / 10), Putchar((char)(x % 10 + '0')); else Putchar((char)(x + '0')); }
    inline void flush() { fwrite(obuf, 1, ooh - obuf, stdout); }
}
using namespace FAST_IO;