嗅到了一丝快读的气息

P1307 [NOIP2011 普及组] 数字反转

R浩轩泽Anmicius @ 2019-10-10 17:40:38

~~没想到有一天我又会死在入门里~~

不知道这段代码和快读有没有什么关系（蒟蒻没学过快读），~~但它没输出~~ 大佬们请指教！！

#include<iostream>
using namespace std;
char c;
bool f;
int n;
int main()
{
    cin>>c;
    n=0;
    if(c=='-')f=true;
    else n+=c-'0';
    while(cin>>c&&c!='\n')
    n=n+10*(c-'0');
    if(f)cout<<'-';
    cout<<n<<endl;
    return 0;
}

~~教练：“快初赛了你还在入门”~~

by saxiy @ 2019-10-10 17:57:53

随手码的快读板子

template <typename T> read(T &x) {
    x = 0; register char c(getchar()); bool f = 0;
    for(;!isdigit(c);c = getchar()) if(c == '-') f = 1;
    for(; isdigit(c);c = getchar())
        x = (x << 3) + (x << 1) + (c ^ 48);
    if(f) x = -x;
}

by saxiy @ 2019-10-10 17:59:33

@Jessie12138 应该是

n=10*n+(c-'0');

by saxiy @ 2019-10-10 18:00:06

可以参考秦九韶算法。

by R浩轩泽Anmicius @ 2019-10-11 17:08:04

@saxiy 蒟蒻瞅瞅