func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 2e5 + 10;   struct P {     long long x, y;     P() {}     P(long long _x, long long _y) : x(_x), y(_y) {}     P operator+(const P &o) { return P(x + o.x, y + o.y); }     P operator-(const P &o) { return P(x - o.x, y - o.y); }     long long operator*(const P &o) {       if (!x && !o.x) return 0;       if (!x) return -y;       if (!o.x) return o.y;       if (fabs(1.0 * o.y / o.x - 1.0 * y / x) < 1e-10) {         return 0;       }       if (1.0 * y / x < 1.0 * o.y / o.x) {         return 1;       } else {         return -1;       }     }     bool operator<(const P &o) const { return x == o.x ? y < o.y : x < o.x; }   };   struct E {     int tot;     int lnk[N], nxt[N << 1], son[N << 1];     P w[N << 1];     E() { tot = 1; }     void add(int x, int y, P pt) {       nxt[++tot] = lnk[x], son[tot] = y, w[tot] = pt, lnk[x] = tot;     }     void adde(int x, int y, P pt) { add(x, y, pt), add(y, x, pt); }   } S, T;   int n, m, k, all, mx, gid, gu, gv;   int cnt, na, nb, s1, s2, qaq;   int las[N], sz[N], dl[N];   P pa[N << 3], qa[N << 3], qb[N << 3], ans[N << 3];   void build(int x, int p) {     for (int j = S.lnk[x]; j; j = S.nxt[j]) {       if (S.son[j] != p) {         T.adde(las[x], ++k, P(0, 0));         T.adde(k, S.son[j], S.w[j]);         las[x] = k;         build(S.son[j], x);       }     }   }   void dfs_sz(int x, int p) {     sz[x] = 1;     for (int j = T.lnk[x], v; j; j = T.nxt[j]) {       if (!dl[j >> 1] && T.son[j] != p) {         dfs_sz(T.son[j], x);         sz[x] = sz[x] + sz[T.son[j]];         v = min(sz[T.son[j]], all - sz[T.son[j]]);         if (mx < v) {           mx = v;           gid = j;           gu = x, gv = T.son[j];         }       }     }   }   void dfs_calc(int x, int p, P pt) {     pa[++cnt] = pt;     for (int j = T.lnk[x]; j; j = T.nxt[j]) {       if (!dl[j >> 1] && T.son[j] != p) {         dfs_calc(T.son[j], x, pt + T.w[j]);       }     }   }   void making(int &num, P *pt) {     sort(pa + 1, pa + cnt + 1);     pt[num = 1] = pa[1];     for (int i = 2; i <= cnt; ++i) {       for (; num >= 2; --num) {         if ((pa[i] - pt[num - 1]) * (pt[num] - pt[num - 1]) > 0) {           break;         }       }       pt[++num] = pa[i];     }   }   void merge() {     if (!na || !nb) {       for (int i = 1, t = max(na, nb); i <= t; ++i) {         ans[++qaq] = na ? qa[i] : qb[i];       }       return;     }     ans[++qaq] = qa[1] + qb[1];     for (int u = 2, v = 2; u <= na || v <= nb;) {       if (u > na) {         ans[++qaq] = qa[u - 1] + qb[v++];       } else if (v > nb) {         ans[++qaq] = qa[u++] + qb[v - 1];       } else {         P du = qa[u] - qa[u - 1], dv = qb[v] - qb[v - 1];         if (du * dv < 0) {           ans[++qaq] = qa[u++] + qb[v - 1];         } else {           ans[++qaq] = qa[u - 1] + qb[v++];         }       }     }   }   void divide(int x, int t) {     if (t == 1) {       return;     }     all = t, mx = gu = gv = 0;     dfs_sz(x, 0);     int x1 = gv, s1 = sz[gv], x2 = gu, s2 = all - s1;     dl[gid >> 1] = 1;     cnt = 0, dfs_calc(x1, x2, P(0, 0)), making(na, qa);     cnt = 0, dfs_calc(x2, x1, T.w[gid]), making(nb, qb);     merge();     divide(x1, s1);     divide(x2, s2);   }   long long val(P pt, int sl) { return pt.x * sl + pt.y; }   int main() {     scanf( %d%d , &n, &m), k = n;     for (int i = 1, x, y, z1, z2; i < n; ++i) {       scanf( %d%d%d%d , &x, &y, &z1, &z2);       S.adde(x, y, P(z1, z2));     }     for (int i = 1; i <= n; ++i) {       las[i] = i;     }     build(1, 0);     divide(1, k);     cnt = qaq;     memcpy(pa, ans, sizeof pa);     making(qaq, ans);     for (int i = 0, cur = 1; i < m; ++i) {       for (; cur < qaq; ++cur) {         if (val(ans[cur], i) > val(ans[cur + 1], i)) {           break;         }       }       printf( %lld , val(ans[cur], i));       putchar(i < m - 1 ?     :   n );     }     return 0;   }   