11被浏览5097分享邀请回答use std::iter::range_
use std::string::S
fn main() {
const MAX_NUM: int = 20;
range_step(1, MAX_NUM, 2)
.map(|x| (x, range_step(1, x + 2, 2)
.chain(range_step(x - 2, -1, -2))))
.map(|(x, mut iter)| {
let nsp = ((MAX_NUM && 1) * 3) - ((x && 1) * 3);
println!("{}{}", String::from_char(nsp as uint, ' '),
iter.fold("".to_string(), |mut b, a| {
b.push_str(format!("{:3d}", a).as_slice());
.collect::&Vec&()&&();
初玩函数式，写得不好求意见
9 11 13 11
9 11 13 15 13 11
9 11 13 15 17 15 13 11
9 11 13 15 17 19 17 15 13 11
MAX_NUM大于100之后，要改一下哦，不然不好看。刚看到题主的红框还框了下一道题，要么我也帮你做做吧use std::iter::range_
fn main() {
for (y, x) in range_inclusive::&uint&(1, 10).flat_map(|x| range(1, x).zip(repeat(x))) {
println!("{},{}", x, y);
我人这么好，题主给我点个赞嘛 同学写了半天，这问题竟然被关闭了。乐于助人的他非常渴望要帮助题主，于是他用C++写了个版本#include &iostream&
#include &iomanip&
#define TRIANGLE_NUM 21
template &int N&
struct REPEAT;
template &&
struct REPEAT&0& {
template &class F&
struct BODY {
inline static void EXECUTE() {}
template &int N&
struct REPEAT {
template &class F&
struct BODY {
inline static void EXECUTE() {
F::EXECUTE();
REPEAT & N - 1 &::BODY&typename F&::EXECUTE();
template &int BEGIN, int END, int STEP&
struct RANGE;
template &int BEGIN, int END, int STEP&
struct RANGE {
template &template&int& class F&
struct BODY {
inline static void EXECUTE() {
struct DO_NOTING {
inline static void EXECUTE() {}
IF & BEGIN &= END, F&BEGIN&, DO_NOTING &::VALUETYPE::EXECUTE();
IF & BEGIN + STEP &= END, RANGE & BEGIN + STEP, END, STEP &::template BODY&F&, DO_NOTING &::VALUETYPE::EXECUTE();
template &bool COND, typename THEN, typename ELSE&
struct IF;
template &typename THEN, typename ELSE&
struct IF&true, THEN, ELSE& {
typedef THEN VALUETYPE;
template &typename THEN, typename ELSE&
struct IF&false, THEN, ELSE& {
typedef ELSE VALUETYPE;
template &int N&
struct INTEGER {
static const int VALUE = N;
template &int N&
struct ABS {
static const int VALUE = IF & (N & 0), INTEGER&N&, INTEGER & -N & & ::VALUETYPE::VALUE;
template &int NUM&
struct ADDN {
template &template &int N1& class F&
struct BODY {
template &int N2&
struct FUNC {
inline static void EXECUTE() {
F & NUM - ABS&N2&::VALUE &::EXECUTE();
template &template &int N& class F&
struct PRINT {
template &int N&
struct FUNC {
inline static void EXECUTE() {
std::cout && std::setw(3) && F&N&::VALUE;
template &template &int N& class F&
struct LINE {
template &int N&
struct FUNC {
static void EXECUTE() {
struct PRINT_BLANK {
inline static void EXECUTE() {
std::cout && " ";
REPEAT & 3 * (TRIANGLE_NUM - N) / 2 &::BODY&PRINT_BLANK&::EXECUTE();
RANGE & F & -N + 1 &::VALUE, F&N&::VALUE, 2 &::BODY&ADDN&N&::BODY&PRINT&INTEGER&::FUNC&::FUNC&::EXECUTE();
std::cout && std::endl;
int main()
RANGE&1, TRIANGLE_NUM, 2&::BODY&LINE&INTEGER&::FUNC&::EXECUTE();
题主，你看好多好心人呐2213 条评论分享收藏感谢收起11 条评论分享收藏感谢收起如果您觉得 好 请用力
如果您觉得 差 请用力
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