[PAT-Advanced] A1054. The Dominant Color (20)

总题解目录

[PAT- Advanced Level] 甲级题解目录（Advanced Level）

A1054. 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

Analysis

• 选出处于统治地位的数字（颜色），题中要求为多于半数。
• 用map做hash表。

C++ Code

//NKW 甲级真题1043
#include 
#include 
#include 
using namespace std;

map<int, int> mp;

int main(){
	int m, n, temp;
	scanf("%d %d", &m, &n);
	for (int i = 0; i < n; i++){
		for (int j = 0; j < m; j++){
			scanf("%d", &temp);
			mp[temp]++;
			if (mp[temp] > m*n / 2){
				printf("%d\n", temp);
				return 0;
			}
		}
	}
	return 0;
}
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