From 370130ccb03ca7e5596231c2c1e6fa42de9044bb Mon Sep 17 00:00:00 2001
From: MCC <cocahack@naver.com>
Date: Wed, 26 Jun 2019 12:07:10 +0900
Subject: [PATCH] =?UTF-8?q?[Jake]=20=EB=B0=B1=EC=A4=80=202580=EB=B2=88=20?=
 =?UTF-8?q?=EC=8A=A4=EB=8F=84=EC=BF=A0=20=ED=92=80=EC=9D=B4?=
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---
 190624/jake/2580.cpp | 75 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 190624/jake/2580.cpp

diff --git a/190624/jake/2580.cpp b/190624/jake/2580.cpp
new file mode 100644
index 0000000..f177661
--- /dev/null
+++ b/190624/jake/2580.cpp
@@ -0,0 +1,75 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+bool solved = false;
+int board[9][9], answer[9][9];
+bool row[9][10]{0,}, col[9][10]{0,}, block[9][10]{0,};
+
+void get_next(int& y, int& x) {
+  for(int i=0; i<9; ++i){
+    for(int j=0; j<9; ++j){
+      if(!board[i][j]){
+        y = i, x = j;
+        return;
+      }
+    }
+  }
+}
+
+bool check_possible(int y, int x, int v){
+  return !col[y][v] && !row[x][v] && !block[(y/3)*3+(x/3)][v];
+}
+
+void set_boolean(int y, int x, int v, bool set_or_unset) {
+  col[y][v] = row[x][v] = block[(y/3)*3+(x/3)][v] = set_or_unset;
+}
+
+void solve() {
+  if(solved) return;
+  int y = -1, x = -1;
+  get_next(y, x);
+
+  if(y == -1){
+    for(int i=0; i<9; ++i){
+      for(int j=0; j<9; ++j){
+        answer[i][j] = board[i][j];
+      }
+    }
+    solved = true;
+    return;
+  }
+
+  for(int v=1; v<10; ++v) {
+    if(check_possible(y, x, v)){
+      set_boolean(y, x, v, true);
+      board[y][x] = v;
+      solve();
+      board[y][x] = 0;
+      set_boolean(y, x, v, false);
+    }
+  }
+}
+
+int main()
+{
+  ios_base::sync_with_stdio(false);
+  cin.tie(NULL);
+
+  for(int i=0; i<9; ++i){
+    for(int j=0; j<9; ++j){
+      cin >> board[i][j];
+      set_boolean(i, j, board[i][j], true);
+    }
+  }
+
+  solve();
+
+  for(int i=0; i<9; ++i){
+    for(int j=0; j<9; ++j){
+      cout << answer[i][j] << " ";
+    }
+    cout << "\n";
+  }
+
+  return 0;
+}