Statistical count tree for the hysbz 1036 tree

Silly template questions, hands-on training speed and accuracy rate ..

#include <cstdio>#include <cstring>#include <algorithm>#include <map>#include <set>#include <bitset>#include <queue>#include <stack>#include <string>#include <iostream>#include <cmath>#include <climits>using namespace std;const int maxn = 3e4 + 10;int head[maxn], u[maxn << 1], v[maxn << 1], nxt[maxn << 1], ecnt;int siz[maxn], maxson[maxn], top[maxn], fa[maxn], tid[maxn], idcnt;int n, q, maxv[maxn << 2], sumv[maxn << 2], dep[maxn], sval[maxn], val[maxn];void adde(int uu, int vv) {u[ecnt] = uu; v[ecnt] = vv;nxt[ecnt] = head[uu]; head[uu] = ecnt++;}void init() {memset(head, -1, sizeof(head));memset(maxson, -1, sizeof(maxson));idcnt = ecnt = 0;}void dfs1(int now, int nowfa, int nowdep) {dep[now] = nowdep; fa[now] = nowfa; siz[now] = 1;for(int i = head[now]; ~i; i = nxt[i]) if(v[i] != nowfa) {dfs1(v[i], now, nowdep + 1);siz[now] += siz[v[i]];if(maxson[now] == -1 || siz[maxson[now]] < siz[v[i]]) {maxson[now] = v[i];}}}void dfs2(int now, int tp) {tid[now] = ++idcnt;top[now] = tp;if(maxson[now] == -1) return;dfs2(maxson[now], tp);for(int i = head[now]; ~i; i = nxt[i]) {if(v[i] != fa[now] && v[i] != maxson[now]) {dfs2(v[i], v[i]);}}}#define lson rt << 1, l, mid#define rson rt << 1 | 1, mid + 1, rvoid pushup(int rt) {int lc = rt << 1, rc = rt << 1 | 1;sumv[rt] = sumv[lc] + sumv[rc];maxv[rt] = max(maxv[lc], maxv[rc]);}void build(int rt, int l, int r) {int mid = (l + r) >> 1;if(l == r) sumv[rt] = maxv[rt] = sval[l];else {build(lson); build(rson);pushup(rt);}}void update(int rt, int l, int r, int pos, int Val) {if(l == r) maxv[rt] = sumv[rt] = Val;else {int mid = (l + r) >> 1;if(pos <= mid) update(lson, pos, Val);else update(rson, pos, Val);pushup(rt);}}int query_max(int rt, int l, int r, int ql, int qr) {if(ql <= l && qr >= r) return maxv[rt];int mid = l + r >> 1, ret = -1e9;if(ql <= mid) ret = max(ret, query_max(lson, ql, qr));if(qr > mid) ret = max(ret, query_max(rson, ql, qr));return ret;}int query_sum(int rt, int l, int r, int ql, int qr) {if(ql <= l && qr >= r) return sumv[rt];int mid = l + r >> 1, ret = 0;if(ql <= mid) ret += query_sum(lson, ql, qr);if(qr > mid) ret += query_sum(rson, ql, qr);return ret;}int ask_max(int x, int y) {int ret = -1e9;while(top[x] != top[y]) {if(dep[top[x]] < dep[top[y]]) {swap(x, y);}ret = max(ret, query_max(1, 1, idcnt, tid[top[x]], tid[x]));x = fa[top[x]];}if(dep[x] > dep[y]) swap(x, y);ret = max(ret, query_max(1, 1, idcnt, tid[x], tid[y]));return ret;}int ask_sum(int x, int y) {int ret = 0;while(top[x] != top[y]) {if(dep[top[x]] < dep[top[y]]) swap(x, y);ret += query_sum(1, 1, idcnt, tid[top[x]], tid[x]);x = fa[top[x]];}if(dep[x] > dep[y]) swap(x, y);ret += query_sum(1, 1, idcnt, tid[x], tid[y]);return ret;}int main() {while(scanf("%d", &n) != EOF) {init();for(int i = 1; i < n; i++) {int a, b; scanf("%d%d", &a, &b);adde(a, b); adde(b, a);}for(int i = 1; i <= n; i++) scanf("%d", &val[i]);scanf("%d", &q);dfs1(1, 1, 1); dfs2(1, 1);for(int i = 1; i <= n; i++) {sval[tid[i]] = val[i];}build(1, 1, idcnt);char cmd[16];int a, b, c;while(q--) {scanf("%s%d%d", cmd, &a, &b);if(strcmp("QMAX", cmd) == 0) {printf("%d\n", ask_max(a, b));}else if(strcmp("QSUM", cmd) == 0) {printf("%d\n", ask_sum(a, b));}else {update(1, 1, idcnt, tid[a], b);}}}return 0;}

　　

Statistical count tree for the hysbz 1036 tree