View Compilation Error

0_0_32433890_12806.cpp: In function 'int dfs(int, int, int, int)':
0_0_32433890_12806.cpp:81:20: error: 'n' was not declared in this scope
     for(int i=1;i<=n;i++){
                    ^
0_0_32433890_12806.cpp:83:12: error: 'depth' was not declared in this scope
         if(depth[v]==dep[u]+1&&c[u][v]){
            ^