View Compilation Error

0_0_25695050_18744.cpp: In function 'int checkrow(int)':
0_0_25695050_18744.cpp:25:9: error: 'i' was not declared in this scope
     for(i=x-3;i<=x;i++)
         ^
0_0_25695050_18744.cpp: In function 'void dfs(int, int)':
0_0_25695050_18744.cpp:39:17: error: 'reutnr' was not declared in this scope
     if(num>ans) reutnr ;
                 ^