PAT(stl)——1054. The Dominant Color (20)

Behind the scenes in the computer’s memory, color is always talked about as a series of 24 bits of information for each pixel. In an image, the color with the largest proportional area is called the dominant color. A strictly dominant color takes more than half of the total area. Now given an image of resolution M by N (for example, 800×600), you are supposed to point out the strictly dominant color.

Input Specification:

Each input file contains one test case. For each case, the first line contains 2 positive numbers: M (<=800) and N (<=600) which are the resolutions of the image. Then N lines follow, each contains M digital colors in the range [0, 224). It is guaranteed that the strictly dominant color exists for each input image. All the numbers in a line are separated by a space.

Output Specification:

For each test case, simply print the dominant color in a line.

Sample Input:
5 3
0 0 255 16777215 24
24 24 0 0 24
24 0 24 24 24
Sample Output:
24

题目大意:

简单的计数题。

题目解析:

具体代码:

#include<iostream>
#include<algorithm>
#include<map>
#include<vector>
using namespace std;

#define MAXN 100000000
int A[MAXN];
map<int,int> list;

int main()
{
    int m,n;
    scanf("%d%d",&m,&n);
    for(int i=0;i<m;i++)
    	for(int j=0;j<n;j++){
    		int color;
    		scanf("%d",&color);
    		if(list.find(color)==list.end())
    			list[color]=1;
    		else
    			list[color]++;
    		if(list[color]>m*n/2){
    			printf("%d",color);
    			return 0;
			}
		}
    return 0;
}
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