1054 The Dominant Color (20 分)（map）

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

生词

英文	解释
proportional	成比例的
dominant	主导的
resolution	分辨率

题目大意：

选取主色调，就是M列N行的矩阵里面出现次数多余一半的那个数字～

分析：

STL中map的应用～使用arr[i] = j表示i元素在矩阵中出现了j次，在输入的同时比较arr当前的值是否已经超过半数，如果超过，就直接输出该数字并退出程序～

原文链接：https://blog.csdn.net/liuchuo/article/details/52118849

题解

#include <bits/stdc++.h>

using namespace std;
map<string,int> pix;
int main()
{
#ifdef ONLINE_JUDGE
#else
    freopen("1.txt", "r", stdin);
#endif
    int m,n;
    string s;
    cin>>m>>n;
    for(int i=0;i<n;i++){
       for(int j=0;j<m;j++){
            cin>>s;
            pix[s]++;
       }
    }
    for(auto it=pix.begin();it!=pix.end();it++){
        if(it->second>m*n/2)
            cout<<it->first<<endl;
    }
    return 0;
}