1054. The Dominant Color (20)
2018-01-29 22:11
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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:
Sample Output:
24
常规思维,超时算法:#include <iostream>
using namespace std;
int main(int argc, const char * argv[]) {
int m, n;
cin >> m >> n;
string s[m*n], t;
int num = 0, nc[480000] = {0};
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
int flag = 1;
cin >> t;
for (int k = 0; k < num; k++) {
if(t == s[k]){
flag = 0;
nc[k]++;
}
}
if (flag) {
s[num] = t;
nc[num++] = 1;
}
}
}
for (int i = 0; i < num; i++) {
if (nc[i] > m*n / 2) {
cout << s[i] << endl;
}
}
return 0;
}
使用map的算法:
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
常规思维,超时算法:#include <iostream>
using namespace std;
int main(int argc, const char * argv[]) {
int m, n;
cin >> m >> n;
string s[m*n], t;
int num = 0, nc[480000] = {0};
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
int flag = 1;
cin >> t;
for (int k = 0; k < num; k++) {
if(t == s[k]){
flag = 0;
nc[k]++;
}
}
if (flag) {
s[num] = t;
nc[num++] = 1;
}
}
}
for (int i = 0; i < num; i++) {
if (nc[i] > m*n / 2) {
cout << s[i] << endl;
}
}
return 0;
}
使用map的算法:
#include <cstdio> #include <map> using namespace std; int main() { int m, n; scanf("%d %d", &m, &n); map<int, int> arr; int half = m * n / 2; for(int i = 0; i < n; i++) { for(int j = 0; j < m; j++) { int temp; scanf("%d", &temp); arr[temp]++; if(arr[temp] > half) { printf("%d", temp); return 0; } } } return 0; }
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