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【lightoj 1012 Guilty Prince (一题被搞死)】

记得很久以前做过这个题目的，那时候记得应该实在福州oj上做过的。

1012 - Guilty Prince

Time Limit: 2 second(s)

Memory Limit: 32 MB

Once there was a king named Akbar. He had a son named Shahjahan. For an unforgivable reason the king wanted him to leave the kingdom. Since he loved his son he decided his son would be banished in a new place. The prince became sad, but he followed his father's will. In the way he found that the place was a combination of land and water. Since he didn't know how to swim, he was only able to move on the land. He didn't know how many places might be his destination. So, he asked your help.

For simplicity, you can consider the place as a rectangular grid consisting of some cells. A cell can be a land or can contain water. Each time the prince can move to a new cell from his current position if they share a side.

Now write a program to find the number of cells (unit land) he could reach including the cell he was living.

Input

Input starts with an integer T (≤ 500), denoting the number of test cases.

Each case starts with a line containing two positive integers W and H; W and H are the numbers of cells in the x and y directions, respectively. W and H are not more than 20.

There will be H more lines in the data set, each of which includes W characters. Each character represents the status of a cell as follows.

1) '.' - land

2) '#' - water

3) '@' - initial position of prince (appears exactly once in a dataset)

Output

For each case, print the case number and the number of cells he can reach from the initial position (including it).

Sample Input

Output for Sample Input

6 9

....#.

.....#

......

#@...#

.#..#.

11 9

.#.........

.#.#######.

.#.#.....#.

.#.#.###.#.

.#.#..@#.#.

.#.#####.#.

.#.......#.

.#########.

...........

11 6

..#..#..#..

..#..#..###

..#..#..#@.

..#..#..#..

7 7

..#.#..

###.###

...@...

###.###

..#.#..

Case 1: 45

Case 2: 59

Case 3: 6

Case 4: 13

PROBLEM SETTER: AKM MUBASHWIR ALAM

SPECIAL THANKS: JANE ALAM JAN (SOLUTION, DATASET)

========================================================================================================================================

先贴自己代码吧。不过还是不能通过，本机都没有通过嘞。。弱弱了。。。

  1 // Project name : 1012 ( 1012 Guilty Prince ) 
  2 // File name    : main.cpp
  3 // Author       : iCoding
  4 // E-mail       : honi.linux@gmail.com
  5 // Date & Time  : Wed Aug  8 19:11:24 2012
  6 
  7 
  8 #include <iostream>
  9 #include <stdio.h>
 10 #include <string>
 11 #include <cmath>
 12 #include <algorithm>
 13 using namespace std;
 14 
 15 /*************************************************************************************/
 16 /* data */
 17 #ifndef MAXN
 18 #define MAXN 30
 19 #endif
 20 
 21 const char CH_EMPTY = '.';
 22 const char CH_START = '@';
 23 const char CH_BLOCK = '#';
 24 
 25 int n, m;
 26 
 27 char iMap[MAXN][MAXN];
 28 
 29 int iAnswer;
 30 
 31 int dir_x[4] = {0 , 0, -1, 1};
 32 int dir_y[4] = {-1, 1,  0, 0};
 33 
 34 int start_x;
 35 int start_y;
 36 /*************************************************************************************/
 37 /* procedure */
 38 void debug()
 39 {
 40     cout << "--debug msg--" << endl;
 41 }
 42 void iInit()
 43 {
 44     /*set all memory of iMap to CH_BLOCK*/
 45     for (int i = 0; i < MAXN; i++)
 46     {
 47         for (int j = 0; j < MAXN; j++)
 48         {
 49             iMap[i][j] = CH_BLOCK;
 50         }
 51     }
 52 
 53     /*init for iAnswer*/
 54     iAnswer = 0;
 55 
 56     /*init for iMap*/
 57     for (int i = 1; i <= n; i++)
 58     {
 59         string line;
 60         cin >> line;
 61         //cout << line << endl;
 62         for (int j = 1; j <= m; j++)
 63         {
 64             if      (line[j-1] == CH_EMPTY)
 65             {
 66                 iMap[i][j] = CH_EMPTY;
 67             }
 68             else if (line[j-1] == CH_BLOCK)
 69             {
 70                 iMap[i][j] = CH_BLOCK;
 71             }
 72             else if (line[j-1] == CH_START)
 73             {
 74                 iMap[i][j] = CH_EMPTY;
 75                 start_x = i;
 76                 start_y = j;
 77             }
 78         }
 79     }
 80 }
 81 
 82 bool iCanGo(int x, int y)
 83 {
 84     if (iMap[x][y] == CH_BLOCK)
 85     {
 86         return false;
 87     }
 88     else
 89     {
 90         return true;
 91     }
 92 }
 93 
 94 void iDFS(int x, int y)
 95 {
 96     //debug();
 97     cout << "--" << x <<  " " << y << endl;
 98     /*iMap[x][y] = CH_BLOCK;
 99     iAnswer++;
100     for (int iDirCase = 0; iDirCase < 4; iDirCase++)
101     {
102         if (iCanGo(x + dir_x[iDirCase] , y + dir_y[iDirCase]))
103         {
104             iDFS(x + dir_x[iDirCase] , y + dir_y[iDirCase]);
105         }
106     }*/
107 
108     bool iFlagGo[4] = {false, false, false, false};
109     for (int iDirCase = 0; iDirCase < 4; iDirCase++)
110     {
111         if (iCanGo(x + dir_x[iDirCase] , y + dir_y[iDirCase]))
112         {
113             iFlagGo[iDirCase] = true;
114             iMap[x + dir_x[iDirCase]][y + dir_y[iDirCase]] = CH_BLOCK;
115             iAnswer++;
116         }
117     }
118 
119     for (int iDirCase = 0; iDirCase , 4; iDirCase++)
120     {
121         if (iFlagGo[iDirCase])
122         {
123             iDFS(x + dir_x[iDirCase] , y + dir_y[iDirCase]);
124         }
125     }
126 }
127 
128 
129 /*************************************************************************************/
130 /* main */
131 int main()
132 {
133     int iT;
134     cin >> iT;
135     for (int iCaseCount = 1; iCaseCount <= iT; iCaseCount++)
136     {
137         cout << "Case " << iCaseCount << ": ";
138         cin >> m >> n;
139         iInit();
140         iMap[start_x][start_y] = CH_BLOCK;
141         iAnswer = 1;
142         iDFS(start_x, start_y);
143         cout << iAnswer << endl;
144     }
145     return 0;
146 }
147 
148 // end 
149 // Code by Sublime text 2
150 // iCoding@CodeLab

本来今晚是

2012阿里云“凌云杯”高校编程大赛 - 热身赛（时间待定）

可是进去没题目的。。搞毛啊。。。所以还是自己找题做咯。。

先上自己代码。等下AC继续。。。

终于AC了。。原来在119杭的iDirCase < 4写成了iDirCase , 4。。。罪过罪过。。害我调试那么久。。

  1 // Project name : 1012 ( 1012 Guilty Prince ) 
  2 // File name    : main.cpp
  3 // Author       : iCoding
  4 // E-mail       : honi.linux@gmail.com
  5 // Date & Time  : Wed Aug  8 19:11:24 2012
  6 
  7 
  8 #include <iostream>
  9 #include <stdio.h>
 10 #include <string>
 11 #include <cmath>
 12 #include <algorithm>
 13 using namespace std;
 14 
 15 /*************************************************************************************/
 16 /* data */
 17 #ifndef MAXN
 18 #define MAXN 30
 19 #endif
 20 
 21 const char CH_EMPTY = '.';
 22 const char CH_START = '@';
 23 const char CH_BLOCK = '#';
 24 
 25 int n, m;
 26 
 27 char iMap[MAXN][MAXN];
 28 
 29 int iAnswer;
 30 
 31 int dir_x[4] = {0 , 0, -1, 1};
 32 int dir_y[4] = {-1, 1,  0, 0};
 33 
 34 int start_x;
 35 int start_y;
 36 /*************************************************************************************/
 37 /* procedure */
 38 void debug()
 39 {
 40     cout << "--debug msg--" << endl;
 41 }
 42 void iInit()
 43 {
 44     /*set all memory of iMap to CH_BLOCK*/
 45     for (int i = 0; i < MAXN; i++)
 46     {
 47         for (int j = 0; j < MAXN; j++)
 48         {
 49             iMap[i][j] = CH_BLOCK;
 50         }
 51     }
 52 
 53     /*init for iAnswer*/
 54     iAnswer = 0;
 55 
 56     /*init for iMap*/
 57     for (int i = 1; i <= n; i++)
 58     {
 59         string line;
 60         cin >> line;
 61         //cout << line << endl;
 62         for (int j = 1; j <= m; j++)
 63         {
 64             if      (line[j-1] == CH_EMPTY)
 65             {
 66                 iMap[i][j] = CH_EMPTY;
 67             }
 68             else if (line[j-1] == CH_BLOCK)
 69             {
 70                 iMap[i][j] = CH_BLOCK;
 71             }
 72             else if (line[j-1] == CH_START)
 73             {
 74                 iMap[i][j] = CH_EMPTY;
 75                 start_x = i;
 76                 start_y = j;
 77             }
 78         }
 79     }
 80 }
 81 
 82 bool iCanGo(int x, int y)
 83 {
 84     if (iMap[x][y] == CH_BLOCK)
 85     {
 86         return false;
 87     }
 88     else
 89     {
 90         return true;
 91     }
 92 }
 93 
 94 void iDFS(int x, int y)
 95 {
 96     //debug();
 97     //cout << "--" << x <<  " " << y << endl;
 98     /*iMap[x][y] = CH_BLOCK;
 99     iAnswer++;
100     for (int iDirCase = 0; iDirCase < 4; iDirCase++)
101     {
102         if (iCanGo(x + dir_x[iDirCase] , y + dir_y[iDirCase]))
103         {
104             iDFS(x + dir_x[iDirCase] , y + dir_y[iDirCase]);
105         }
106     }*/
107 
108     bool iFlagGo[4] = {false, false, false, false};
109     for (int iDirCase = 0; iDirCase < 4; iDirCase++)
110     {
111         if (iCanGo(x + dir_x[iDirCase] , y + dir_y[iDirCase]))
112         {
113             iFlagGo[iDirCase] = true;
114             iMap[x + dir_x[iDirCase]][y + dir_y[iDirCase]] = CH_BLOCK;
115             iAnswer++;
116         }
117     }
118 
119     for (int iDirCase = 0; iDirCase < 4; iDirCase++)
120     {
121         if (iFlagGo[iDirCase])
122         {
123             iDFS(x + dir_x[iDirCase] , y + dir_y[iDirCase]);
124         }
125     }
126 }
127 
128 
129 /*************************************************************************************/
130 /* main */
131 int main()
132 {
133     int iT;
134     cin >> iT;
135     for (int iCaseCount = 1; iCaseCount <= iT; iCaseCount++)
136     {
137         cout << "Case " << iCaseCount << ": ";
138         cin >> m >> n;
139         iInit();
140         iMap[start_x][start_y] = CH_BLOCK;
141         iAnswer = 1;
142         iDFS(start_x, start_y);
143         cout << iAnswer << endl;
144     }
145     return 0;
146 }
147 
148 // end 
149 // Code by Sublime text 2
150 // iCoding@CodeLab

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原文地址：https://www.cnblogs.com/ismdeep/p/2628898.html