1054 The Dominant Color (20 分)
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 [0,2^24 ). 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
#include<bits/stdc++.h>
using namespace std;
int N, M, temp, digit = -1;
unordered_map<int, int> m;
int main() {
scanf("%d%d", &N, &M);
int len = N * M / 2;
for (int i = 0; i < N; i++)
for (int j = 0; j < M; j++) {
scanf("%d", &temp);
m[temp]++;
if (m[temp] > len) {
digit = temp;
}
}
printf("%d", digit);
return 0;
}