[板子]快速讀入

標籤：pre   mes   ||   char   sync   false   name   sign   getchar   

iostream

    ios::sync_with_stdio(false);    cin.tie(0);}

getchar() 版

// for Integerstemplate <class T> inline void read(T &x) {    x = 0; int ch = getchar(), f = 0;    while (ch < '0' || ch > '9') {        if (ch == '-') f = 1;        ch = getchar();    }    while (ch >='0' && ch <='9') {        x = (x << 1) + (x << 3) + (ch ^ 48);        ch = getchar();    }    if (f) x = -x;}

fread() 版

namespace fastIO{    #define BUF_SIZE 100000    #define OUT_SIZE 100000    bool IOerror = 0;    inline char nc() {        static char buf[BUF_SIZE], *p1 = buf + BUF_SIZE, *pend = buf+BUF_SIZE;        if(p1 == pend) {            p1 = buf; pend = buf + fread(buf, 1, BUF_SIZE, stdin);            if(pend == p1) {IOerror = 1; return -1;}        }        return *p1++;    }    inline bool blank(char ch) {return ch == ' ' || ch == '\n' || ch == '\r' || ch == '\t';}    template<class T> inline bool read(T &x){        bool sign = 0; char ch = nc(); x = 0;        for(; blank(ch); ch = nc());        if(IOerror) return false;        if(ch == '-') sign = 1, ch = nc();        for(; ch >= '0' && ch <= '9'; ch = nc()) x = (x << 1) + (x << 3) + (ch ^ 48);        if(sign) x = -x;        return true;    }    inline bool read(double &x){        bool sign = 0; char ch = nc(); x = 0;        for(; blank(ch); ch = nc());        if(IOerror) return false;        if(ch == '-') sign = 1, ch = nc();        for(; ch >= '0' && ch <= '9'; ch = nc()) x = x * 10.0 + (ch ^ 48);        if(ch == '.') {            double tmp = 1; ch = nc();            for(; ch >= '0' && ch <= '9'; ch = nc()) tmp /= 10.0, x += tmp * (ch ^ 48);        }        if(sign) x = -x;        return true;    }    inline bool read(char *s){        char ch = nc();        for(; blank(ch); ch = nc());        if(IOerror) return false;        for(; !blank(ch) && !IOerror; ch = nc()) *s++ = ch;        *s = 0;        return true;    }    template<class T,class... U>bool read(T& h,U&... t){return read(h)&&read(t...);}    #undef OUT_SIZE    #undef BUF_SIZE}using namespace fastIO;

注意: template<class T,class... U>bool read(T& h,U&... t){return read(h)&&read(t...);}是 c++11裡規定的，考試時應該禁止使用

[板子]快速讀入