Rotten_oranges_leetcode.cpp

Graph/rotten_oranges.cpp

@@ -0,0 +1,129 @@
+#include <iostream>
+#include<queue>
+using namespace std;
+int c;
+int r;
+void check(queue< pair<int,int> > &q,int a[101][101],int &flag)
+{
+      pair<int,int> b=q.front();
+      int x=b.first;
+      int y=b.second;
+
+      if(a[x-1][y]==1 && x>=0)
+      {
+         q.push({x-1,y});
+         a[x-1][y]=2;
+         if(flag==0)
+         {
+             flag=1;
+         }
+      }
+
+      if(a[x+1][y]==1 && x<r)
+      {
+          q.push({x+1,y});
+          a[x+1][y]=2;
+          if(flag==0)
+          {
+              flag=1;
+          }
+      }
+
+      if(a[x][y+1]==1 && y<c)
+      {
+          q.push({x,y+1});
+          a[x][y+1]=2;
+          if(flag==0)
+          {
+              flag=1;
+          }
+      }
+
+      if(a[x][y-1]==1 && y>=0)
+      {
+          q.push({x,y-1});
+          a[x][y-1]=2;
+          if(flag==0)
+          {
+              flag=1;
+          }
+      }
+
+}
+
+
+int main() {
+
+  ios_base:: sync_with_stdio(false);
+    cin.tie(NULL); cout.tie(NULL);
+
+    // #ifndef ONLINE_JUDGE
+    // freopen("input.txt","r",stdin);
+    // freopen("output.txt","w",stdout);
+    // #endif
+    int t;
+    cin>>t;
+    for(int i=0;i<t;i++)
+    {
+    cin>>r;
+    cin>>c;
+    int a[101][101];
+    queue< pair<int,int> >q;
+    for(int i=0;i<r;i++)
+    {
+        for(int j=0;j<c;j++)
+        {
+            cin>>a[i][j];
+
+        if(a[i][j]==2)
+        {
+            q.push({i,j});
+        }
+
+        }
+
+    }
+      int time=0;
+      int flag=0;
+      q.push({-1,-1});
+      while(!q.empty())
+      {
+          if(q.front()!=make_pair(-1,-1))
+          {
+              // we will create check_function
+              check(q,a,flag);
+              q.pop();
+          }
+          else if(q.front()==make_pair(-1,-1))
+          {
+            time=time+flag;
+            flag=0;
+              q.pop();
+              if(q.empty())
+              {
+                  break;
+              }
+              else if(!q.empty())
+              {
+                  q.push({-1,-1});
+              }
+          }
+
+      }
+
+       // now checking if no present 1
+       for(int i=0;i<r;i++)
+       {
+           for(int j=0;j<c;j++)
+           {
+               if(a[i][j]==1)
+               {
+                   time=-1;
+               }
+           }
+       }
+
+       cout<<time<<endl;
+
+    }
+}