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 3
0 0 255 16777215 24
24 24 0 0 24
24 0 24 24 24

Sample Output:

24

题解

数组中出现次数最多的数。

#include <bits/stdc++.h>using namespace std;map<int, int> mp;int m, n;int main(){    ios::sync_with_stdio(false);    cin.tie(0);    cin >> m >> n;     int ans = 0, cnt = 0;    int pixel;    for(int i = 0; i < m * n; ++i){        cin >> pixel;        mp[pixel]++;        if(cnt < mp[pixel]){            cnt = mp[pixel];            ans = pixel;        }    }    cout << ans << endl;    return 0;}