记录编号	589245	评测结果	AAAAAAAAAA
题目名称	飘雪圣域	最终得分	100
用户昵称	┭┮﹏┭┮	是否通过	通过
代码语言	C++	运行时间	0.480 s
提交时间	2024-07-04 14:09:51	内存使用	15.08 MiB

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define in inline
#define db double
#define re register
#define pii pair<int,int>
#define fi first 
#define se second
#define pb(x) push_back(x)
#define D(i,a,b) for(re long double i = a;i >= b;i--)
#define F(i,a,b) for(re long long i = a;i <= b;i++)
const int N = 2e5+10,M = 4e6+1e5;
const ll inf = 1e17;

ll read(){
    ll x = 0,f = 1;char c = getchar();
    for(;c < '0' || c > '9';c = getchar())if(c == '-')f = -1;
    for(;c >= '0' && c <= '9';c = getchar())x = (x<<1) + (x<<3) + c-'0';
    return x * f;
}


int n,m;
struct made{int l,id; };
vector<made>q[N];
vector<int>a[N];
int ans[N];

struct BIT{
    int c[N];
    in int lowbit(int x){return x & (-x);}
    void add(int x,int val){for(;x <= n;x += lowbit(x))c[x] += val;}
    int ask(int x){
        int ans = 0;
        for(;x > 0;x -= lowbit(x))ans += c[x];
        return ans;
    }
}t;


int main(){
    freopen("icekingdom.in","r",stdin);
    freopen("icekingdom.out","w",stdout);
    n = read(),m = read();
    for(int i = 1;i < n;i++){
        int x = read(),y = read();
        if(x > y)swap(x,y);
        a[y].push_back(x);
    }
    for(int i = 1;i <= m;i++){
        int l = read(),r = read();
        q[r].push_back({l,i});
    }
    for(int i = 1;i <= n;i++){
        for(int j = 0;j < a[i].size();j++)t.add(a[i][j],1);
        for(int j = 0;j < q[i].size();j++){
            int l = q[i][j].l;
            ans[q[i][j].id] = i - l + 1 - (t.ask(i) - t.ask(l-1));
        }
    }
    for(int i = 1;i <= m;i++)printf("%d\n",ans[i]);
    
	return cerr << "Time : " << clock() << " ms" << endl, 0;
        
}