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作死变码风

感觉自己的码风和幼儿园的一样。。就去找了一发Google的dalao的码风指南。。以后应该要码风突变了。。。

总结下吧，首先class和namespace的都不大用，这些的可以省去。因为dev-c++没有变量名补全的功能，为了速度那些变量的规则也不需要了。指针什么的我就没写过一次。。

主要是格式那一章有点用。首先以后要大括号不换行了，可能一开始会有点不适应吧。。还有就是好像要增加一些空格，主要是运算符两边和分号后面。

if

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if (condition) {
    ....
} else if (condition) {
    ...
} else {
    ...
}
 
if (condition) return 0;
 

1.if 和左圆括号间都有个空格. 右圆括号和左大括号之间也要有个空格
2.如果能增强可读性, 简短的条件语句允许写在同一行. 只有当语句简单并且没有使用 else 子句时使用
3.如果语句中某个 if-else 分支使用了大括号的话, 其它分支也必须使用apple的bug

for/while

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for (int i = 1; i <= n; ++i) {
    for (int j = 1; j <= n; ++j) {
        ...
    }
}
 
for (; pos <= n && test > p; pos += test, ++test) {}
 
while (condition) continue;
 

空循环体应使用 {} 或 continue, 而不是一个简单的分号

水平留白

建议直接看原文。。

主要就这些了吧，打算把板子再打一遍，以前的板子都不能用了。。。。

放几个板子来感受一下。。

fhqtreap

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#include <cstdio>
#include <cstdlib>
using namespace std;
int inline read()
{
    int x=0, f=1;char ch = getchar();
    while (ch < '0' || ch > '9') { if (ch == '-') f=-1; ch = getchar(); }
    while (ch >= '0' && ch <= '9') { x = x * 10 + ch - '0';ch = getchar(); }
    return x * f;
}
const int N = 500010;
int ch[N][2], val[N], pri[N], siz[N], sz;
void update(int x) { siz[x] = 1 + siz[ch[x][0]] + siz[ch[x][1]]; }
int new_node(int v) {
    siz[++sz] = 1;
    val[sz] = v;
    pri[sz] = rand();
    return sz;
}
int merge(int x, int y) {
    if (!x || !y) return x + y;
    if (pri[x] < pri[y]) {
        ch[x][1] = merge(ch[x][1], y);
        update(x);
        return x;
    } else {
        ch[y][0] = merge(x, ch[y][0]);
        update(y);
        return y;
    }
}
void split(int now, int k, int &x, int &y) {
    if (!now) x = y = 0;
    else {
        if (val[now] <= k)
            x = now, split(ch[now][1], k, ch[now][1], y);
        else
            y = now, split(ch[now][0], k, x, ch[now][0]);
        update(now);
    }
}
int kth(int now, int k) {
    while (1) {
        if (k <= siz[ch[now][0]])
            now = ch[now][0];
        else if (k == siz[ch[now][0]] + 1)
            return now;
        else
            k -= siz[ch[now][0]] + 1, now=ch[now][1];
    }
}
main() {
    srand(2001331);
    int T, com, x, y, z, a, b, root=0;
    T = read();
    while (T--) {
        com = read(), a = read();
        if (com == 1) {
            split(root, a, x, y);
            root = merge(merge(x, new_node(a)), y);
        } else if (com == 2) {
            split(root, a, x, z);
            split(x, a-1, x, y);
            y = merge(ch[y][0], ch[y][1]);
            root = merge(merge(x, y), z);
        } else if (com == 3) {
            split(root, a-1, x, y);
            printf("%d\n", siz[x] + 1);
            root = merge(x, y);
        } else if (com == 4) {
            printf("%d\n", val[kth(root, a)]);
        } else if (com == 5) {
            split(root, a-1, x, y);
            printf("%d\n", val[kth(x, siz[x])]);
            root = merge(x, y);
        } else if (com == 6) {
            split(root, a, x, y);
            printf("%d\n", val[kth(y, 1)]);
            root = merge(x, y);
        }
    }
}
 

链剖lca

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#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;
const int N = 500010;
struct edge {
    int to,next;
}e[N<<1];
int st[N], siz[N], top[N], son[N], fa[N], deep[N];
int tot, n, m, x, y, root;
void add(int x, int y) {
    e[++tot].next = st[x];
    e[tot].to = y, st[x] = tot;
}
void dfs1(int now) {
    siz[now] = 1;
    for (int i = st[now]; i; i = e[i].next)
        if (e[i].to != fa[now]) {
            fa[e[i].to] = now;
            deep[e[i].to] = deep[now] + 1;
            dfs1(e[i].to);
            siz[now] += siz[e[i].to];
            if (siz[son[now]] < siz[e[i].to])
                son[now] = e[i].to;
        }
}
void dfs2(int now, int tp) {
    top[now] = tp;
    if (son[now])
        dfs2(son[now], tp);
    for (int i = st[now]; i; i = e[i].next)
        if (e[i].to != fa[now] && e[i].to != son[now])
            dfs2(e[i].to, e[i].to);
}
int lca(int x, int y) {
    while (top[x] != top[y]) deep[top[x]] > deep[top[y]] ? x = fa[top[x]] : y = fa[top[y]];
    return deep[x] > deep[y] ? y : x;
}
main() {
    scanf("%d%d%d", &n, &m, &root);
    for (int i = 1; i < n; ++i)
        scanf("%d%d", &x, &y),
        add(x, y),add(y, x);
    dfs1(root);
    dfs2(root,root);
    for (int i = 1; i <= m; ++i)
        scanf("%d%d", &x, &y),
        printf("%d\n", lca(x,y));
}
 

lct（luogu模版）

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#include <cstdio>
#include <cstring>
#include <algorithm>
#include <map>
using namespace std;
const int N = 300010;
int n, m, x, y, f[N], ch[N][2], res[N], val[N], siz[N];
map<int,int>ma;
void update(int x) {
    if (ch[x][0] && ch[x][1])
        siz[x] = siz[ch[x][0]] ^ siz[ch[x][1]], siz[x] ^= val[x];
    else if (ch[x][0])
        siz[x] = siz[ch[x][0]] ^ val[x];
    else if (ch[x][1])
        siz[x] = siz[ch[x][1]] ^ val[x];
    else
        siz[x] = val[x];
}
void pushdown(int x) {
    if (res[x] && x) {
        if (ch[x][0]) res[ch[x][0]] ^= 1;
        if (ch[x][1]) res[ch[x][1]] ^= 1;
        swap(ch[x][0], ch[x][1]);
        res[x]=0;
    }
}
int is_root(int x) { return ch[f[x]][1] != x && ch[f[x]][0] != x; }
int get_son(int x) { return ch[f[x]][1] == x; }
void rot(int x) {
    int fa = f[x], fafa = f[fa], k = get_son(x);
    if (!is_root(fa))
        ch[fafa][ch[fafa][1] == fa] = x;
    ch[fa][k] = ch[x][k ^ 1], f[ch[fa][k]] = fa;
    ch[x][k ^ 1] = fa, f[fa] = x, f[x] = fafa;
    update(fa), update(x);
}
void pushs(int x) {
    if (!is_root(x)) pushs(f[x]);
    pushdown(x);
}
void splay(int x) {
    pushs(x);
    for (int fa; !is_root(x); rot(x))
        if (!is_root(fa = f[x]))
            rot(get_son(x) == get_son(fa) ? fa : x);
}
void access(int x) {
    for (int y = 0; x; y = x, x = f[x])
        splay(x), ch[x][1] = y, update(x);
}
int find_rt(int x) {
    access(x), splay(x);
    while (ch[x][0]) x = ch[x][0];
    return x;
}
void make_root(int x) {
    access(x), splay(x);
    res[x] ^= 1;
}
void link(int x, int y) {
    make_root(x);
    f[x] = y;
    splay(x);
}
void cut(int x, int y) {
    make_root(x), access(y), splay(y);
    ch[y][0] = f[x] = 0;
}
main() {
    scanf("%d%d", &n, &m);
    for (int i = 1; i <= n; ++i)
        scanf("%d", &val[i]), siz[i] = val[i];
    for (int i = 1; i <= m; ++i) {
        int com, x, y;
        scanf("%d%d%d", &com, &x, &y);
        if (com == 0) {
            make_root(x);
            access(y);
            splay(y);
            printf("%d\n", siz[y]);
        } else if (com == 1) {
            if (find_rt(x) != find_rt(y)) {
                link(x, y);
                if (ma[x] == 0)
                    ma[x] = y;
                else
                    ma[y] = x;
            }
        } else if (com == 2) {
            if (ma[x] == y) {
                ma[x] = 0;
                cut(x, y);
            } else if (ma[y] == x) {
                ma[y] = 0;
                cut(x, y);
            }
        } else if (com==3) {
            splay(x);
            siz[x] ^= val[x];
            val[x] = y;
            siz[x] ^= y;
        }
    }
}
 

fft

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#include <cstdio>
#include <algorithm>
#include <cmath>
using namespace std;
const double pi=acos(-1.0);
const int N = 2000010;
int n, m, r[N];
struct complex {
    double x, y;
    complex (double xx = 0, double yy = 0) {
        x = xx, y = yy;
    }
}a[N], b[N], o[N], a_o[N];
complex operator + (complex a,complex b) { return complex(a.x + b.x, a.y + b.y); }
complex operator - (complex a,complex b) { return complex(a.x - b.x, a.y - b.y); }
complex operator * (complex a,complex b) { return complex(a.x*b.x - a.y*b.y, a.x*b.y + a.y*b.x); }
void init(int n) {
    double t = 2 * pi / n;
    for (int i = 0; i <= n; ++i) {
        o[i] = complex(cos(2.0 * pi * i / n), sin(2.0 * pi * i / n));
        a_o[i] = complex(cos(2.0 * pi * i / n),-1 * sin(2.0 * pi * i / n));
    }
}
void fft(int n, complex *a, complex *w)
{
    for (int i = 0; i < n; ++i)
        if (i < r[i])
            swap(a[i], a[r[i]]);
    for (int i = 2; i <= n; i <<= 1) {
        int m = i >> 1;
        for (int j = 0; j < n;j += i)
            for (int k = 0; k < m; ++k) {
                complex t = a[j + m + k] * w[n / i * k];
                a[j + m + k] = a[j + k] - t;
                a[j + k] = a[j + k] + t;
            }
    }
}
main() {
    static int n,m,fn,l=0;
    scanf("%d%d", &n, &m);
    for (int i = 0; i <= n; ++i) scanf("%lf", &a[i].x);
    for (int i = 0; i <= m; ++i) scanf("%lf", &b[i].x);
    fn = 1;
    while (fn <= n + m) fn <<= 1, ++l;
    for (int i = 0; i < fn; ++i)
        r[i] = (r[i >> 1] >> 1) | ((i & 1) << (l - 1));
    init(fn);
    fft(fn, a, o);
    fft(fn, b, o);
    for (int i = 0; i <= fn; ++i)
        a[i] = a[i] * b[i];
    fft(fn, a, a_o);
    for (int i = 0;i <= n + m; ++i)
        printf("%d ", (int)(a[i].x / fn + 0.5));
}
 

怎么说吧，还是挺好的。。虽然有点不适应，但是还是能写下来吧。。

感觉大括号不换行也是挺不错的。。

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2 COMMENTS

  1. Refun2018-01-25 下午1:55

    大括号不换行才是最优美的！！→_→

    [ 回复 ]
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