이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
int a[50005], seg[200005];
void build(int L, int R, int node){
if(L==R){
seg[node]=a[L];
return;
}
int M=(L+R)/2;
build(L, M, 2*node);
build(M+1, R, 2*node+1);
seg[node]=min(seg[2*node], seg[2*node+1]);
}
int query(int a, int b, int L, int R, int node){
if(L>R) return -1;
if(b<L || a>R) return -1;
if(a<=L && R<=b) return seg[node];
int M=(L+R)/2;
return min(query(a, b, L, M, 2*node), query(a, b, M+1, R, 2*node+1));
}
void update(int a, int v, int L, int R, int node){
if(a<L || a>R) return;
if(L==R){
seg[node]=v;
return;
}
int M=(L+R)/2;
update(a, v, L, M, 2*node);
update(a, v, M+1, R, 2*node+1);
seg[node]=min(seg[2*node], seg[2*node+1]);
}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
int n, m;
cin>>n>>m;
for(int i=1;i<n;i++){
int u, v;
cin>>u>>v>>a[i];
}
build(1, n, 1);
int q;
cin>>q;
while(q--){
int t, x, y;
cin>>t>>x>>y;
if(t==1){
update(x, y, 1, n, 1);
}
else{
int ans1, ans2;
int L=x-1, R=n-1;
while(L<R){
int M=(L+R+1)/2;
if(query(x, M, 1, n, 1) > y) R=M-1;
else L=M;
}
ans1=L;
L=1, R=x;
while(L<R){
int M=(L+R)/2;
if(query(M, x-1, 1, n, 1) > y) L=M+1;
else R=M;
}
ans2=L;
cout<<ans1-ans2+1<<"\n";
}
}
}
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