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  • Bear and Colors (思维)

     Bear and Colors 

    CodeForces - 673C

    Bear Limak has n colored balls, arranged in one long row. Balls are numbered 1through n, from left to right. There are n possible colors, also numbered 1 through n. The i-th ball has color ti.

    For a fixed interval (set of consecutive elements) of balls we can define a dominantcolor. It's a color occurring the biggest number of times in the interval. In case of a tie between some colors, the one with the smallest number (index) is chosen as dominant.

    There are n(n+1)/2 non-empty intervals in total. For each color, your task is to count the number of intervals in which this color is dominant

    Input

    The first line of the input contains a single integer n (1 ≤ n ≤ 5000) — the number of balls.

    The second line contains n integers t1, t2, ..., tn (1 ≤ ti ≤ n) where ti is the color of the i-th ball.

    Output

    Print n integers. The i-th of them should be equal to the number of intervals where i is a dominant color.

    Examples

    Input
    4
    1 2 1 2
    Output
    7 3 0 0 
    Input
    3
    1 1 1
    Output
    6 0 0 

    Note

    In the first sample, color 2 is dominant in three intervals:

    • An interval [2, 2] contains one ball. This ball's color is 2 so it's clearly a dominant color.
    • An interval [4, 4] contains one ball, with color 2 again.
    • An interval [2, 4] contains two balls of color 2 and one ball of color 1.

    There are 7 more intervals and color 1 is dominant in all of them.

    题意:输入N,接下来一行输入N个数,每个数代表一个颜色,在每一个子区间里面,如果某种颜色的个数最多或者有和这种颜色个数一样多的颜色,但是代表该颜色的序号小,那么该颜色就是该区间的主色。问以每种颜色为主色的区间数是多少。

    思路:

      纯思维。 两层for循环枚举每个区间,开一个num数组代表每个区级里面每种颜色的个数。

      

     1 #include<iostream>
     2 #include<cstdio>
     3 #include<cstring>
     4 #include<algorithm>
     5 using namespace std;
     6 const int maxn=5010;
     7 int n;
     8 int a[maxn],ans[maxn],num[maxn];
     9 int main()
    10 {
    11     scanf("%d",&n);
    12     for(int i=1;i<=n;i++)
    13     {
    14         scanf("%d",&a[i]);
    15     }
    16     int pos;
    17     int t=0;
    18     for(int i=1;i<=n;i++)
    19     {
    20         memset(num,0,sizeof(num));
    21         t=0;
    22         for(int j=i;j<=n;j++)
    23         {
    24             num[a[j]]++;
    25             if(num[a[j]]>t||(num[a[j]]==t&&a[j]<pos))
    26             {
    27                 pos=a[j];
    28                 t=num[a[j]];
    29                 ans[pos]++;
    30             }
    31             else
    32             {
    33                 ans[pos]++;
    34             }
    35         }
    36     }
    37     for(int i=1;i<n;i++)
    38     {
    39         printf("%d ",ans[i]);
    40     }
    41     printf("%d
    ",ans[n]);
    42 }
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  • 原文地址:https://www.cnblogs.com/1013star/p/9940585.html
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