标签：style blog http io ar color os 使用 sp
Determine if a Sudoku is valid, according to: Sudoku Puzzles - The Rules.
The Sudoku board could be partially filled, where empty cells are filled with the character ‘.‘.
A partially filled sudoku which is valid.
Note:
A valid Sudoku board (partially filled) is not necessarily solvable. Only the filled cells need to be validated.
注意：其中没有填的也代表有效的，用‘.‘表示。为了是每行每列以及每个9方格中没有重复的元素，使用了set来存放，本来想用map的，但是map每次要存放两个元素，多余。
当每行或每列填满之后，可以直接判断set的长度是否为9，否则就是有重复的元素。
C++代码如下：
#include<iostream> #include<set> #include<vector> using namespace std; class Solution { public: bool isValidSudoku(vector<vector<char> > &board) { set<char> st; size_t dot=0; int i,j; for(i=0; i<9; i++) { st.clear(); dot=0; for(j=0; j<9; j++) { if(board[i][j]==‘.‘) { dot++; continue; } st.insert(board[i][j]); } if(st.size()<9-dot) return false; } for(i=0; i<9; i++) { st.clear(); dot=0; for(j=0; j<9; j++) { if(board[j][i]==‘.‘) { dot++; continue; } st.insert(board[j][i]); } if(st.size()<9-dot) return false; } int block=0; for(block=0; block<9; block++) { dot=0; st.clear(); for(i=block/3*3; i<block/3*3+3; i++) { for(j=block%3*3; j<block%3*3+3; j++) { if(board[i][j]==‘.‘) { dot++; continue; } st.insert(board[i][j]); } } if(st.size()<9-dot) return false; } return true; } }; int main() { Solution s; /*vector<vector<char> > vec= {{‘8‘,‘1‘,‘4‘,‘6‘,‘5‘,‘2‘,‘7‘,‘3‘,‘9‘}, {‘9‘,‘5‘,‘7‘,‘1‘,‘8‘,‘3‘,‘6‘,‘2‘,‘4‘}, {‘2‘,‘3‘,‘6‘,‘9‘,‘7‘,‘4‘,‘1‘,‘5‘,‘8‘}, {‘6‘,‘9‘,‘5‘,‘4‘,‘3‘,‘7‘,‘2‘,‘8‘,‘1‘}, {‘4‘,‘8‘,‘1‘,‘5‘,‘2‘,‘6‘,‘3‘,‘9‘,‘7‘}, {‘3‘,‘7‘,‘2‘,‘8‘,‘9‘,‘1‘,‘5‘,‘4‘,‘6‘}, {‘5‘,‘6‘,‘9‘,‘3‘,‘1‘,‘8‘,‘4‘,‘7‘,‘2‘}, {‘7‘,‘4‘,‘8‘,‘2‘,‘6‘,‘5‘,‘9‘,‘1‘,‘3‘}, {‘1‘,‘2‘,‘3‘,‘7‘,‘4‘,‘9‘,‘8‘,‘6‘,‘5‘} };*/ vector<vector<char> >vec= {{‘.‘,‘.‘,‘5‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘,‘6‘}, {‘.‘,‘.‘,‘.‘,‘.‘,‘1‘,‘4‘,‘.‘,‘.‘,‘.‘}, {‘2‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘}, {‘1‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘}, {‘5‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘}, {‘6‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘}, {‘7‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘}, {‘8‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘}, {‘9‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘,‘.‘}, }; cout<<s.isValidSudoku(vec)<<endl; }
标签：style blog http io ar color os 使用 sp
原文地址：http://www.cnblogs.com/wuchanming/p/4106736.html
