View Compilation Error

0_0_33564663_12729.cpp: In function 'int main(int, const char**)':
0_0_33564663_12729.cpp:31:17: error: 'i' was not declared in this scope
             for(i=xl;i<=xr;i++)for(j=yl;j<=yr;j++)vis[i][j]=0;
                 ^
0_0_33564663_12729.cpp:31:19: error: 'xl' was not declared in this scope
             for(i=xl;i<=xr;i++)for(j=yl;j<=yr;j++)vis[i][j]=0;
                   ^
0_0_33564663_12729.cpp:31:25: error: 'xr' was not declared in this scope
             for(i=xl;i<=xr;i++)for(j=yl;j<=yr;j++)vis[i][j]=0;
                         ^
0_0_33564663_12729.cpp:31:36: error: 'j' was not declared in this scope
             for(i=xl;i<=xr;i++)for(j=yl;j<=yr;j++)vis[i][j]=0;
                                    ^
0_0_33564663_12729.cpp:31:38: error: 'yl' was not declared in this scope
             for(i=xl;i<=xr;i++)for(j=yl;j<=yr;j++)vis[i][j]=0;
                                      ^
0_0_33564663_12729.cpp:31:44: error: 'yr' was not declared in this scope
             for(i=xl;i<=xr;i++)for(j=yl;j<=yr;j++)vis[i][j]=0;
                                            ^