LRJ-Example-06-13-Uva1103
pic[][]数组存储每个点的值，0或1，输入时在原图的周围加了一圈0。
color[][]数组存储每个点的color值，从1开始，dfs(row, col, c) 负责对每个点着色，连通在一起的连通块的颜色相同。
因为最先着色的是最外围的白色点，即background white，这些点的color值是1。
neighbour[]数组的下标是color值，内容是一个set，存储下标color所代表的连通块周围的连通块的颜色，background white这个连通块不算。
比如
1. 测试用例
6 2
00
7c
44
7c
30
00
代表图像A， 会有3个color，color 1 是 backgroud white， color 2 是唯一的黑色连通块，color 3 是黑色连通块中间的空白区域
2. 测试用例
10 3
000
778
548
748
578
700
000
7f0
1e0
000
代表图像AKW， 会有7个color，color 1 是 backgroud white， color 2, 3, 5 是三个黑色连通块，color 4,6,5 是黑色连通块中间的空白区域
#define _CRT_SECURE_NO_WARNINGS // UVa1103 Ancient Messages // Rujia Liu // we pad one empty line/column to the top/bottom/left/right border, so color 1 is always "background" white #include<cstdio> #include<cstring> #include<algorithm> #include<vector> #include<set> using namespace std; char bin[256][5]; const int maxh = 200 + 5; const int maxw = 50 * 4 + 5; int H, W, pic[maxh][maxw], color[maxh][maxw]; char line[maxw]; void decode(char ch, int row, int col) { for (int i = 0; i < 4; i++) pic[row][col + i] = bin[ch][i] - '0'; } const int dr[] = { -1, 1, 0, 0 }; const int dc[] = { 0, 0, -1, 1 }; // dfs from (row, col) and paint color c void dfs(int row, int col, int c) { color[row][col] = c; for (int i = 0; i < 4; i++) { int row2 = row + dr[i]; int col2 = col + dc[i]; if (row2 >= 0 && row2 < H && col2 >= 0 && col2 < W && // within range pic[row2][col2] == pic[row][col] && // same color, both black or both white color[row2][col2] == 0) // not colored yet dfs(row2, col2, c); } } vector<set<int> > neighbors; void check_neighbors(int row, int col) { for (int i = 0; i < 4; i++) { int row2 = row + dr[i]; int col2 = col + dc[i]; if (row2 >= 0 && row2 < H && col2 >= 0 && col2 < W && // within range pic[row2][col2] == 0 && // this neighbour is a white point color[row2][col2] != 1) // not the background wihte, the outmost white area (background white) is colored 1 neighbors[color[row][col]].insert(color[row2][col2]); } } const char* code = "WAKJSD"; char recognize(int c) { int cnt = neighbors[c].size(); return code[cnt]; } // use this function to print the decoded picture void print() { for (int i = 0; i < H; i++) { for (int j = 0; j < W; j++) printf("%d", pic[i][j]); printf("\n"); } } int main() { strcpy(bin['0'], "0000"); strcpy(bin['1'], "0001"); strcpy(bin['2'], "0010"); strcpy(bin['3'], "0011"); strcpy(bin['4'], "0100"); strcpy(bin['5'], "0101"); strcpy(bin['6'], "0110"); strcpy(bin['7'], "0111"); strcpy(bin['8'], "1000"); strcpy(bin['9'], "1001"); strcpy(bin['a'], "1010"); strcpy(bin['b'], "1011"); strcpy(bin['c'], "1100"); strcpy(bin['d'], "1101"); strcpy(bin['e'], "1110"); strcpy(bin['f'], "1111"); int kase = 0; while (scanf("%d%d", &H, &W) == 2 && H) { memset(pic, 0, sizeof(pic)); for (int i = 0; i < H; i++) { scanf("%s", line); for (int j = 0; j < W; j++) decode(line[j], i + 1, j * 4 + 1); } H += 2; // pad one line on top and bottom W = W * 4 + 2; // pad one line on left and right int cnt = 0; vector<int> cc; // connected components of 1 (black points), their colors are stored memset(color, 0, sizeof(color)); for (int i = 0; i < H; i++) { for (int j = 0; j < W; j++) { if (!color[i][j]) { dfs(i, j, ++cnt); if (pic[i][j] == 1) // black point cc.push_back(cnt); } } } neighbors.clear(); neighbors.resize(cnt + 1); //cnt is color, starting from 1, neighbors[1], ..., neighbors[cnt] are used, neighbors[0] is unused for (int i = 0; i < H; i++) { for (int j = 0; j < W; j++) { if (pic[i][j] == 1) // black point check_neighbors(i, j); // check its white point neighbours } } vector<char> ans; for (int i = 0; i < cc.size(); i++) ans.push_back(recognize(cc[i])); sort(ans.begin(), ans.end()); printf("Case %d: ", ++kase); for (int i = 0; i < ans.size(); i++) printf("%c", ans[i]); printf("\n"); } return 0; }
http://www.cnblogs.com/AOQNRMGYXLMV/p/3989724.html
首先图像是被压缩过的，所以我们要把它解码成一个01矩阵。而且我们还要在原图像的四周加一圈白边，这样图中的白色背景都连通起来了。
黑色连通块的个数就是字符的个数。
观察题中字符样式可知，每种字符中包裹的“白洞”的个数是不同的，所以我们可以根据每个字符中的“白洞”的个数来区别这些字符。
然后我们给所有的连通块染色，并用color存储所标记的颜色。第一个染的是白色背景色，编号为1
把所有的黑色连通块的标号存放到cc里面
neighbors是由若干个集合所组成的数组，记录的是黑色连通块i周围相连的非背景色的白块，即“白洞”。
最后每个集合中元素的个数对应的就是字符的编号，最后排序输出即可。
http://www.cnblogs.com/hanbinggan/p/4225044.html
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Case 1: A
Case 2: WW
Case 3: AKW
Case 4: DWWW
Case 5: WWWWWWWW
Case 6: J
Case 7: ADJKSW
Case 8: WWWWWWWWWWWWWWWWWWWW
Case 9: AKW
Case 10: AAAAA
