func_code_string: #include <bits/stdc++.h>   using namespace std;   int N, M;   int timew, cnt;   stack<int> si;   int low[2000005], dep[2000005], siz[2000005], dfn[2000005], nex[2000005],       las[2000005], Arrive[2000005], st[2000005], cnt1;   bool isin[2000005];   void jt(int xx, int yy) {     cnt++;     nex[cnt] = las[xx];     las[xx] = cnt;     Arrive[cnt] = yy;   }   void tarjan(int noww) {     timew++;     low[noww] = dfn[noww] = timew;     si.push(noww);     isin[noww] = true;     for (int i = las[noww]; i; i = nex[i]) {       if (!dfn[Arrive[i]]) {         tarjan(Arrive[i]);         low[noww] = min(low[noww], low[Arrive[i]]);       } else if (isin[Arrive[i]])         low[noww] = min(low[noww], dfn[Arrive[i]]);     }     if (low[noww] == dfn[noww]) {       cnt1++;       int k = -1;       while (k != noww) {         k = si.top();         si.pop();         isin[k] = false;         st[k] = cnt1;         siz[cnt1]++;       }     }   }   void Clear() {     cnt = 0;     cnt1 = 0;     timew = 0;     for (int i = 1; i <= N; i++)       las[i] = dep[i] = st[i] = siz[i] = dfn[i] = low[i] = dep[i] = 0;   }   int main() {     int T;     scanf( %d , &T);     while (T--) {       scanf( %d%d , &N, &M);       Clear();       for (int i = 1; i <= M; i++) {         int u, v;         scanf( %d%d , &u, &v);         if (u != v) jt(u, v);       }       for (int i = 1; i <= N; i++)         if (!dfn[i]) tarjan(i);       if (siz[st[1]] == N) {         puts( No );         continue;       }       for (int i = 1; i <= N; i++)         for (int j = las[i]; j; j = nex[j])           if (st[i] != st[Arrive[j]]) dep[st[i]]++;       bool flag = false;       for (int i = 1; i <= cnt1; i++) {         if (!dep[i] && siz[i]) {           flag = true;           puts( Yes );           vector<int> ans[2];           for (int j = 1; j <= N; j++) ans[st[j] == i].push_back(j);           printf( %d %d n , ans[1].size(), ans[0].size());           for (auto &i : ans[1]) printf( %d  , i);           cout <<   n ;           for (auto &i : ans[0]) printf( %d  , i);           cout <<   n ;           break;         }       }       if (!flag) puts( No );     }     return 0;   }   