PAT_1054: The Dominant Color

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, 800x600), 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 30 0 255 16777215 2424 24 0 0 2424 0 24 24 24

Sample Output:

24

备注：直接用map就过了，注意还是要用scanf，printf进行输入输出，否则会超时。

#include<stdio.h>#include<map>using namespace std;int main(){int M,N;scanf("%d %d",&M,&N);map<int,int> Mymap;for(int i=0;i<M*N;i++){int p;scanf("%d",&p);if(Mymap.count(p)==0)Mymap[p]=1;elseMymap[p]++;if(Mymap[p]>M*N/2){printf("%d",p);return 0;}}return 0;}