answer.code:21:15: error: ‘N’ was not declared in this scope
   21 | vector<int> G[N];
      |               ^
answer.code:22:9: error: ‘N’ was not declared in this scope
   22 | int ans[N << 1], top;
      |         ^
answer.code: In function ‘void dfs(int, int)’:
answer.code:24:19: error: ‘G’ was not declared in this scope
   24 |     for (auto v : G[u]) {
      |                   ^
answer.code:26:9: error: ‘ans’ was not declared in this scope; did you mean ‘abs’?
   26 |         ans[++top] = 0;
      |         ^~~
      |         abs
answer.code:30:9: error: ‘ans’ was not declared in this scope; did you mean ‘abs’?
   30 |         ans[++top] = 1;
      |         ^~~
      |         abs
answer.code: In function ‘__int128 unsigned encode(int, const int*)’:
answer.code:39:9: error: ‘G’ was not declared in this scope
   39 |         G[i].clear();
      |         ^
answer.code:42:9: error: ‘G’ was not declared in this scope
   42 |         G[p[i]].push_back(i);
      |         ^
answer.code:48:13: error: ‘ans’ was not declared in this scope; did you mean ‘abs’?
   48 |         if (ans[i] == 1) {
      |             ^~~
      |             abs
answer.code: At global scope:
answer.code:57:9: error: ‘N’ was not declared in this scope
   57 | int dfn[N << 1];
      |         ^
answer.code: In function ‘void decode(int, __int128 unsigned, int*)’:
answer.code:68:13: error: ‘dfn’ was not declared in this scope; did you mean ‘dfs’?
   68 |             dfn[i] = 1;
      |             ^~~
      |             dfs
answer.code:71:13: error: ‘dfn’ was not declared in this scope; did you mean ‘dfs’?
   71 |             dfn[i] = 0;
      |             ^~~
      |             dfs
answer.code:77:14: error: ‘dfn’ was not declared in this scope; did you mean ‘dfs’?
   77 |         if (!dfn[i]) {
      |              ^~~
      |              dfs
grader_encoder.cpp: In function ‘__int128 unsigned {anonymous}::read()’:
grader_encoder.cpp:7:45: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
    7 | #define gc() ((buff == buf + 100000 ? (fread(buf,1,100000,stdin),buff = buf) : 0),*(buff++))
      |                                        ~~~~~^~~~~~~~~~~~~~~~~~~~
grader_encoder.cpp:12:17: note: in expansion of macro ‘gc’
   12 |         int c = gc();
      |                 ^~
grader_encoder.cpp:7:45: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
    7 | #define gc() ((buff == buf + 100000 ? (fread(buf,1,100000,stdin),buff = buf) : 0),*(buff++))
      |                                        ~~~~~^~~~~~~~~~~~~~~~~~~~
grader_encoder.cpp:13:39: note: in expansion of macro ‘gc’
   13 |         while(c < '0' || c > '9') c = gc();
      |                                       ^~
grader_encoder.cpp:7:45: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
    7 | #define gc() ((buff == buf + 100000 ? (fread(buf,1,100000,stdin),buff = buf) : 0),*(buff++))
      |                                        ~~~~~^~~~~~~~~~~~~~~~~~~~
grader_encoder.cpp:14:62: note: in expansion of macro ‘gc’
   14 |         while(c >= '0' && c <= '9') x = x * 10 + c - '0',c = gc();
      |                                                              ^~