OJ-Problems-Source/hihoCoder/1077_crackpotisback.cpp

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#include <iostream>
#include <cstdio>
#include <cstring>
#include <cmath>
#include <algorithm>
#include <climits>
#include <vector>
#include <queue>
#include <cstdlib>
#include <string>
#include <set>
#include <stack>
#define LL long long
#define pii pair<int,int>
#define INF 0x3f3f3f3f
using namespace std;
const int maxn = 1000010;
struct node {
int lt,rt,minv;
};
node tree[maxn<<2];
void build(int lt,int rt,int v) {
tree[v].lt = lt;
tree[v].rt = rt;
if(lt == rt) {
scanf("%d",&tree[v].minv);
return;
}
int mid = (lt + rt)>>1;
build(lt,mid,v<<1);
build(mid+1,rt,v<<1|1);
tree[v].minv = min(tree[v<<1].minv,tree[v<<1|1].minv);
}
void update(int p,int val,int v) {
if(tree[v].lt == tree[v].rt) {
tree[v].minv = val;
return;
}
if(p <= tree[v<<1].rt) update(p,val,v<<1);
if(p >= tree[v<<1|1].lt) update(p,val,v<<1|1);
tree[v].minv = min(tree[v<<1].minv,tree[v<<1|1].minv);
}
int query(int lt,int rt,int v) {
if(tree[v].lt >= lt && tree[v].rt <= rt)
return tree[v].minv;
int a = INF,b = INF;
if(lt <= tree[v<<1].rt) a = query(lt,rt,v<<1);
if(rt >= tree[v<<1|1].lt) b = query(lt,rt,v<<1|1);
return min(a,b);
}
int main() {
int n,q,u,v,op;
while(~scanf("%d",&n)) {
build(1,n,1);
scanf("%d",&q);
while(q--) {
scanf("%d %d %d",&op,&u,&v);
if(op) update(u,v,1);
else printf("%d\n",query(u,v,1));
}
}
return 0;
}