시간 제한 메모리 제한 제출 정답 맞은 사람 정답 비율
1 초 128 MB 102 15 13 21.667%

문제

버블 정렬은 다음과 같은 의사 코드를 가지는 가장 간단한 정렬 방법 중 하나이다.

void bubble_sort(int *a, int n) {
    int i, j;
    for (i = 0; i < n - 1; ++i) {
        for (j = 0; j < n - 1; ++j) {
            if (a[j] > a[j + 1]) {
                /* 순서가 틀린 쌍이라면, 두 쌍을 교환한다. */ 
                /* 이 때 두 쌍의 교환 횟수는 1 증가한다. */
                int x = a[j];
                a[j] = a[j + 1];
                a[j + 1] = x;
            }
        }
    }
}

길이 n인 배열 A에 대해서 A*를 정의하고자 한다. A*는 배열 A의 i번째 원소와 j번째 원소를 한번만 바꿔놓은 배열이다. (1 <= i < j <= n).

모든 배열 A* 중, 교환 횟수가 최소인 배열 A*의 교환 횟수를 출력하라.

입력

첫번째 줄에 정수 N이 주어지며, 이후 N개의 줄에 배열 A가 A1... AN 순서로 주어진다.

  • 1 <= N <= 100,000
  • 1 <= Ai <= 1,000,000,000

출력

배열 A* 중 교환 횟수가 최소인 배열의 교환 횟수를 출력한다.

예제 입력 1

5
10
3
6
8
1

예제 출력 1

0

힌트

1과 10을 바꾸면 {1,3,6,8,10} 으로 정렬된 형태가 완성되기에 최솟값은 0이다.

[{"problem_id":"5531","problem_lang":"0","title":"\ubc84\ube14 \uc815\ub82c","description":"<p>\ubc84\ube14 \uc815\ub82c\uc740 \ub2e4\uc74c\uacfc \uac19\uc740 \uc758\uc0ac \ucf54\ub4dc\ub97c \uac00\uc9c0\ub294 \uac00\uc7a5 \uac04\ub2e8\ud55c \uc815\ub82c \ubc29\ubc95 \uc911 \ud558\ub098\uc774\ub2e4.<\/p>\r\n\r\n<pre class=\"brush:c++; toolbar:false;\">\r\nvoid bubble_sort(int *a, int n) {\r\n    int i, j;\r\n    for (i = 0; i &lt; n - 1; ++i) {\r\n        for (j = 0; j &lt; n - 1; ++j) {\r\n            if (a[j] &gt; a[j + 1]) {\r\n                \/* \uc21c\uc11c\uac00 \ud2c0\ub9b0 \uc30d\uc774\ub77c\uba74, \ub450 \uc30d\uc744 \uad50\ud658\ud55c\ub2e4. *\/ \r\n                \/* \uc774 \ub54c \ub450 \uc30d\uc758 \uad50\ud658 \ud69f\uc218\ub294 1 \uc99d\uac00\ud55c\ub2e4. *\/\r\n                int x = a[j];\r\n                a[j] = a[j + 1];\r\n                a[j + 1] = x;\r\n            }\r\n        }\r\n    }\r\n}\r\n<\/pre>\r\n\r\n<p>\uae38\uc774 n\uc778 \ubc30\uc5f4 A\uc5d0 \ub300\ud574\uc11c A*\ub97c \uc815\uc758\ud558\uace0\uc790 \ud55c\ub2e4. A*\ub294 \ubc30\uc5f4 A\uc758 i\ubc88\uc9f8 \uc6d0\uc18c\uc640 j\ubc88\uc9f8 \uc6d0\uc18c\ub97c \ud55c\ubc88\ub9cc \ubc14\uafd4\ub193\uc740 \ubc30\uc5f4\uc774\ub2e4. (1 &lt;= i &lt; j &lt;= n).<\/p>\r\n\r\n<p>\ubaa8\ub4e0 \ubc30\uc5f4 A* \uc911, \uad50\ud658 \ud69f\uc218\uac00 \ucd5c\uc18c\uc778 \ubc30\uc5f4 A*\uc758 \uad50\ud658 \ud69f\uc218\ub97c \ucd9c\ub825\ud558\ub77c.<\/p>\r\n","input":"<p>\uccab\ubc88\uc9f8 \uc904\uc5d0 \uc815\uc218 N\uc774 \uc8fc\uc5b4\uc9c0\uba70, \uc774\ud6c4 N\uac1c\uc758 \uc904\uc5d0 \ubc30\uc5f4 A\uac00 A1... AN \uc21c\uc11c\ub85c \uc8fc\uc5b4\uc9c4\ub2e4.<\/p>\r\n\r\n<ul>\r\n\t<li>1 &lt;= N &lt;= 100,000<\/li>\r\n\t<li>1 &lt;= Ai &lt;= 1,000,000,000<\/li>\r\n<\/ul>\r\n","output":"<p>\ubc30\uc5f4 A* \uc911 \uad50\ud658 \ud69f\uc218\uac00 \ucd5c\uc18c\uc778 \ubc30\uc5f4\uc758 \uad50\ud658 \ud69f\uc218\ub97c \ucd9c\ub825\ud55c\ub2e4.<\/p>\r\n","hint":"<p>1\uacfc 10\uc744 \ubc14\uafb8\uba74 {1,3,6,8,10} \uc73c\ub85c \uc815\ub82c\ub41c \ud615\ud0dc\uac00 \uc644\uc131\ub418\uae30\uc5d0 \ucd5c\uc19f\uac12\uc740 0\uc774\ub2e4.<\/p>\r\n","original":"0","problem_lang_code":"\ud55c\uad6d\uc5b4"},{"problem_id":"5531","problem_lang":"2","title":"\u30d0\u30d6\u30eb\u30bd\u30fc\u30c8","description":"<p>\u30d0\u30d6\u30eb\u30bd\u30fc\u30c8\u3068\u306f\uff0c\u5217\u3092\u30bd\u30fc\u30c8\u3059\u308b\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e 1 \u3064\u3067\u3042\u308b\uff0e\u9577\u3055 N \u306e\u6570\u5217 A \u3092\u6607\u9806\u306b\u30bd\u30fc\u30c8\u3057\u305f\u3044\u3068\u3057\u3088\u3046\uff0e\u30d0\u30d6\u30eb\u30bd\u30fc\u30c8\u306f\uff0c\u96a3\u308a\u5408\u3046 2 \u3064\u306e\u6570\u3067\u5927\u5c0f\u95a2\u4fc2\u304c\u5d29\u308c\u3066\u3044\u308b\u3082\u306e\u304c\u3042\u308c\u3070\uff0c\u305d\u308c\u3089\u306e\u4f4d\u7f6e\u3092\u4ea4\u63db\u3059\u308b\uff0e\u3053\u308c\u3092\uff0c\u6570\u5217\u3092\u524d\u304b\u3089\u9806\u306b\u8d70\u67fb\u3057\u306a\u304c\u3089\u884c\u3046\uff0e\u3059\u306a\u308f\u3061\uff0cAi &gt; Ai+1 \u3068\u306a\u3063\u3066\u3044\u308b\u5834\u6240\u304c\u3042\u308c\u3070\uff0c\u305d\u306e 2 \u6570\u3092\u4ea4\u63db\u3059\u308b\u3068\u3044\u3046\u3053\u3068\u3092\uff0ci = 1, 2, . . . , N &minus; 1 \u306b\u5bfe\u3057\u3066\u3053\u306e\u9806\u3067\u884c\u3046\u306e\u304c 1 \u56de\u306e\u8d70\u67fb\u3067\u3042\u308b\uff0e\u3053\u306e\u8d70\u67fb\u3092 N &minus; 1 \u56de\u7e70\u308a\u8fd4\u3059\u3053\u3068\u3067\uff0c\u6570\u5217\u3092\u6607\u9806\u306b\u30bd\u30fc\u30c8\u3067\u304d\u308b\u3053\u3068\u304c\u77e5\u3089\u308c\u3066\u3044\u308b\uff0e<\/p>\r\n\r\n<p>\u6570\u5217 A \u306e\u30d0\u30d6\u30eb\u30bd\u30fc\u30c8\u306b\u3088\u308b\u4ea4\u63db\u56de\u6570\u3068\u306f\uff0c\u6570\u5217 A \u306b\u4e0a\u8a18\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u9069\u7528\u3057\u305f\u6642\u306b\uff0c\u6574\u6570\u306e\u4ea4\u63db\u304c\u884c\u308f\u308c\u308b\u56de\u6570\u3067\u3042\u308b\uff0e\uff08\u30d0\u30d6\u30eb\u30bd\u30fc\u30c8\u3068\u3057\u3066\u77e5\u3089\u308c\u308b\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u53ca\u3073\u5b9f\u88c5\u306b\u306f\uff0c\u30eb\u30fc\u30d7\u306e\u9806\u756a\u3084\u7bc4\u56f2\uff0c\u53ca\u3073\u7d42\u4e86\u6761\u4ef6\u306a\u3069\uff0c\u7d30\u304b\u306a\u5dee\u7570\u304c\u3042\u308b\u5834\u5408\u304c\u3042\u308b\uff0e\u305f\u3060\u3057\uff0c\u540c\u3058\u6570\u5217\u306b\u9069\u7528\u3057\u305f\u969b\u306e\u6574\u6570\u306e\u4ea4\u63db\u56de\u6570\u306f\u305d\u308c\u3089\u306e\u5dee\u7570\u306b\u3088\u308a\u5909\u5316\u3057\u306a\u3044\u3053\u3068\u304c\u77e5\u3089\u308c\u3066\u3044\u308b\uff0e\uff09<\/p>\r\n\r\n<p>\u4f8b\u3048\u3070\uff0c\u4ee5\u4e0b\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u9577\u3055 n \u306e\u6574\u6570\u306e\u914d\u5217 a \u3092\u30d0\u30d6\u30eb\u30bd\u30fc\u30c8\u306b\u3088\u308a\u30bd\u30fc\u30c8\u3059\u308b\u95a2\u6570\u3092 C \u8a00\u8a9e\u3067\u8a18\u8ff0\u3057\u305f\u3082\u306e\u3067\u3042\u308b\uff0e<\/p>\r\n\r\n<pre class=\"brush:c++; toolbar:false;\">\r\nvoid bubble_sort(int *a, int n) {\r\n    int i, j;\r\n    for (i = 0; i &lt; n - 1; ++i) {\r\n        for (j = 0; j &lt; n - 1; ++j) {\r\n            if (a[j] &gt; a[j + 1]) {\r\n                \/* \u4ee5\u4e0b 3 \u884c\u304c 1 \u56de\u306e\u6574\u6570\u306e\u4ea4\u63db\u306b\u76f8\u5f53 *\/\r\n                int x = a[j];\r\n                a[j] = a[j + 1];\r\n                a[j + 1] = x;\r\n            }\r\n        }\r\n    }\r\n}\r\n<\/pre>\r\n\r\n<p>\u9577\u3055 N \u306e\u6570\u5217 A \u304c\u4e0e\u3048\u3089\u308c\u308b\uff0e\u6570\u5217 A \u306e\u4efb\u610f\u306e\u5834\u6240\u306e 2 \u3064\u306e\u6574\u6570\u3092 1 \u56de\u3060\u3051\u4ea4\u63db\u3057\u305f\u6570\u5217 A&prime; \u3092\u4f5c\u308b\u3068\u3059\u308b\uff0e\u6570\u5217 A&prime; \u306e\u30d0\u30d6\u30eb\u30bd\u30fc\u30c8\u306b\u3088\u308b\u4ea4\u63db\u56de\u6570\u306e\u6700\u5c0f\u5024\u3092\u6c42\u3081\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u6210\u305b\u3088\uff0e\uff08\u6700\u521d\u306b\u4ea4\u63db\u3059\u308b 2\u3064\u306e\u6574\u6570\u306f\u5fc5\u305a\u3057\u3082\u96a3\u308a\u5408\u3063\u3066\u3044\u308b\u5fc5\u8981\u306f\u306a\u3044\u3053\u3068\u306b\u6ce8\u610f\u305b\u3088\uff0e\uff09<\/p>\r\n","input":"<p>\u6a19\u6e96\u5165\u529b\u304b\u3089\u4ee5\u4e0b\u306e\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u3081\uff0e<\/p>\r\n\r\n<ul>\r\n\t<li>1 \u884c\u76ee\u306b\u306f\uff0c\u6574\u6570 N \u304c\u66f8\u304b\u308c\u3066\u3044\u308b\uff0eN \u306f\u6570\u5217 A \u306e\u9577\u3055\u3092\u8868\u3059\uff0e<\/li>\r\n\t<li>\u7d9a\u304f N \u884c\u306e\u3046\u3061\u306e i \u884c\u76ee (1 5 i 5 N) \u306b\u306f\uff0c\u6574\u6570 Ai \u304c\u66f8\u304b\u308c\u3066\u3044\u308b\uff0e\u3053\u308c\u306f\u6570\u5217 A \u306e i \u756a\u76ee\u306e\u6574\u6570\u3092\u8868\u3059\uff0e<\/li>\r\n<\/ul>\r\n\r\n<p>\u5236\u9650<\/p>\r\n\r\n<ul>\r\n\t<li>1 &le; N &le; 100 000 \u6570\u5217 A \u306e\u9577\u3055<\/li>\r\n\t<li>1 &le; Ai &le; 1 000 000 000 \u6570\u5217 A \u306b\u542b\u307e\u308c\u308b\u6570\u5b57\u306e\u5927\u304d\u3055<\/li>\r\n<\/ul>\r\n","output":"<p>\u6a19\u6e96\u51fa\u529b\u306b\uff0c\u6570\u5217 A&prime; \u306e\u30d0\u30d6\u30eb\u30bd\u30fc\u30c8\u306b\u3088\u308b\u4ea4\u63db\u56de\u6570\u306e\u6700\u5c0f\u5024\u3092\u8868\u3059\u6574\u6570\u3092 1 \u884c\u3067\u51fa\u529b\u305b\u3088\uff0e<\/p>\r\n","hint":"","original":"1","problem_lang_code":"\uc77c\ubcf8\uc5b4"}]

출처

Olympiad > 일본정보올림피아드 > JOI 2013 5번