func_code_string: #include <bits/stdc++.h>   using namespace std;   const int inf = ~0u >> 1, MOD = 1e9 + 7;   inline int rd() {     int first = 0, c = 0, f = 1;     for (; c <  0  || c >  9 ; c = getchar()) f = c !=  - ;     for (; c >=  0  && c <=  9 ; c = getchar()) first = first * 10 + c -  0 ;     return f ? first : -first;   }   const int N = 2e5 + 11;   struct Edge {     int v, id;     Edge *nex;   } pl[N << 1], *cur = pl, *G[N];   void ins(int u, int v, int id) {     cur->v = v, cur->id = id;     cur->nex = G[u], G[u] = cur++;   }   int wx[N], wy[N], n, m;   int f[N], vis[N], g[N];   void dfs(int first) {     vis[first] = 1;     for (Edge *i = G[first]; i; i = i->nex)       if (!vis[i->v]) {         dfs(i->v);         if (f[i->v]) {           f[i->v] = 0;           f[first] ^= 1;           g[i->id] ^= 1;         }       }   }   int q[N];   int main() {     n = rd(), m = rd();     for (int i = (1), i_end = (m); i <= i_end; i++) {       wx[i] = rd(), wy[i] = rd();       ins(wx[i], wy[i], i), ins(wy[i], wx[i], i);       f[wx[i]] ^= 1;     }     for (int i = (1), i_end = (n); i <= i_end; i++)       if (!vis[i]) dfs(i);     int ans = m;     for (int i = (1), i_end = (n); i <= i_end; i++)       if (f[i]) ans--;     printf( %d n , ans >> 1);     for (int first = (1), x_end = (n); first <= x_end; first++) {       int cnt = 0;       for (Edge *i = G[first]; i; i = i->nex)         if ((wy[i->id] != first) ^ g[i->id]) {           q[++cnt] = (wx[i->id] ^ wy[i->id] ^ first);         }       for (int i = 1; i < cnt; i += 2) {         printf( %d %d %d n , q[i], first, q[i + 1]);       }     }   }   