b422. Colorful Life and Monochromatic Life

contents

1. 1. Problem
2. 2. Sample Input
3. 3. Sample Output
4. 4. Solution

Problem

將一張 rgb 表示的彩色影像變成灰階影像。

套用公式 round((r + g + b)/3) 得到新的像素色彩。

Sample Input

3 2
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18

Sample Output

3 2
2 2 2 5 5 5 8 8 8
11 11 11 14 14 14 17 17 17

Solution

#include <bits/stdc++.h> 
using namespace std;

int main() {
    int n, m;
    while (scanf("%d %d", &n, &m) == 2) {
        printf("%d %d\n", n, m);
        for (int i = 0; i < m; i++) {
            for (int j = 0; j < n; j++) {
                int r, g, b, w;
                scanf("%d %d %d", &r, &g, &b);
                w = (int) round((r + g + b)/3.0);
                printf("%d %d %d%c", w, w, w, j == n-1 ? '\n' : ' ');
            }
        }
    }
    return 0;
}