快速读写挂

有时候读入数据量很大会超时，据说…这时候读写挂能派上用场
快速读写挂

int get() {
    char c;
    while (c = getchar(), (c < '0' || c > '9') && (c != '-'));
    bool flag = (c == '-');
    if (flag) c = getchar();
    int x = 0;
    while (c >= '0' && c <= '9') {
        x = x*10 + c -48;
        c = getchar();
    }
    return flag ? -x : x;
}

cin取消同步 ios::sync_with_stdio(false);

fread读入输出挂

#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <algorithm>
using namespace std;


const int MAXBUF = 10000;
char buf[MAXBUF], *ps = buf, *pe = buf+1;

bool isdigit(char n) {
    if (n >= '0' && n <= '9') return true;
    return false;
}

inline void rnext()
{
    if(++ps == pe)
        pe = (ps = buf)+fread(buf,sizeof(char),sizeof(buf)/sizeof(char),stdin);
}

template <class T>
inline bool in(T &ans)
{
    ans = 0;
    T f = 1;
    if(ps == pe) return false;//EOF
    do{
        rnext();
        if('-' == *ps) f = -1;
    }while(!isdigit(*ps) && ps != pe);
    if(ps == pe) return false;//EOF
    do
    {
        ans = (ans<<1)+(ans<<3)+*ps-48;
        rnext();
    }while(isdigit(*ps) && ps != pe);
    ans *= f;
    return true;
}

const int  MAXOUT=10000;
char bufout[MAXOUT], outtmp[50],*pout = bufout, *pend = bufout+MAXOUT;
inline void write()
{
    fwrite(bufout,sizeof(char),pout-bufout,stdout);
    pout = bufout;
}
inline void out_char(char c){ *(pout++) = c;if(pout == pend) write();}
inline void out_str(char *s)
{
    while(*s)
    {
        *(pout++) = *(s++);
        if(pout == pend) write();
    }
}
template <class T>
inline void out_int(T x) {
    if(!x)
    {
        out_char('0');
        return;
    }
    if(x < 0) x = -x,out_char('-');
    int len = 0;
    while(x)
    {
        outtmp[len++] = x%10+48;
        x /= 10;
    }
    outtmp[len] = 0;
    for(int i = 0, j = len-1; i < j; i++,j--) swap(outtmp[i],outtmp[j]);
    out_str(outtmp);
}

int main()
{
    freopen("in.txt", "r", stdin);
    int t, ca=1;
    in(t);
    while(t--)
    {
        int n;
        in(n);

        out_str("Case #");
        out_int(ca++);
        out_str(": ");
        out_int(n), out_char('n');
    }
    write();
    return 0;
}