參加比賽的隊(duì)或運(yùn)動(dòng)員之間輪流比賽一次，稱為單循環(huán)賽。這種方法能使參加比賽的各隊(duì)或運(yùn)動(dòng)員之間都有比賽的機(jī)會，并能比較準(zhǔn)確地決出參賽隊(duì)或運(yùn)動(dòng)員的名次。但單循環(huán)賽比賽時(shí)間長，需用的場地、器材多，因此參加單循環(huán)賽的隊(duì)數(shù)或人數(shù)不宜過多，否則，應(yīng)采用分組循環(huán)的辦法來進(jìn)行。

我們以7人為例來講講乒乓球單循環(huán)賽

第一輪

1——0

2——7

3——6

4——5

第二輪

1——7

0——6

2——5

3——4

第三輪

1——6

7——5

0——4

2——3

第四輪

1——5

6——4

7——3

0——2

第五輪

1——4

5——3

6——2

7——0

第六輪

1——3

4——2

5——0

6——7

第七輪

1——2

3——0

4——7

5——6

共需要7輪21場比賽，也就是場比賽。以上是1號位固定逆時(shí)針輪轉(zhuǎn)法，它是體育比賽單循環(huán)普遍采用的方法，它的好處是選手間歇時(shí)間一致，而且不會打漏和打重復(fù)。

這里講的是人員數(shù)為奇數(shù)時(shí)的情況，與0對應(yīng)的成員輪空一場，也就是說這場為空，一共需要輪空7場。人員數(shù)為偶數(shù)時(shí)就更簡單了，這里就不做詳細(xì)講解了。

總結(jié)一下，若人員數(shù)或隊(duì)數(shù)為N，當(dāng)N為奇數(shù)時(shí)，一共需要打N輪N(N-1)/2場比賽；當(dāng)N為偶數(shù)時(shí)，一共需要打N-1輪也是N(N-1)/2場比賽。

英文翻譯：

The participating teams or players take turns to compete once, which is called a single round robin. This method enables all teams or athletes participating in the competition to have a chance to compete, and can more accurately determine the ranking of the participating teams or athletes. However, the single round-robin competition takes a long time and requires a lot of venues and equipment. Therefore, the number of teams or the number of people participating in the single round-robin competition should not be too large. Otherwise, the group cycle method should be adopted.

Let’s take 7 people as an example to talk about a single round table tennis match

first round

1——0

2——7

3——6

4——5

second round

1——7

0——6

2——5

3——4

Third round

1——6

7——5

0——4

2——3

Fourth round

1——5

6——4

7——3

0——2

Fifth round

1——4

5——3

6——2

7——0

Sixth round

1——3

4——2

5——0

6——7

Seventh round

1——2

3——0

4——7

5——6

A total of 7 rounds and 21 games are required, that is, 1 game. The above is a fixed counterclockwise rotation method for the No. 1 position. It is a commonly used method for a single cycle of sports competitions. Its advantage is that the players have the same intermittent time and will not miss and repeat.

Here is the situation when the number of personnel is an odd number. The member corresponding to 0 has a bye, that is to say, this is empty, and a total of 7 byes are required. It is even simpler when the number of personnel is even, so I wont explain it in detail here.

To sum up, if the number of personnel or the number of teams is N, when N is an odd number, a total of N rounds of N(N-1)/2 games need to be played; when N is an even number, a total of N-1 rounds need to be played also N( N-1)/2 games.

參考資料：百度；

英文翻譯來源于Google翻譯；

本文由learningyard學(xué)苑原創(chuàng)，歡迎關(guān)注！帶你一起長知識！本文部分內(nèi)容、圖片來源于網(wǎng)絡(luò)，如有侵權(quán)，請聯(lián)系！