Submission #248944

#	Time	Username	Problem	Language	Result	Execution time	Memory
248944		tc_abd	Bridges (APIO19_bridges)	C++14	0 / 100	449 ms	524292 KiB

bridges

#define fast ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0)
#define It it=se.begin();it!=se.end();it++
#define mem(dp,i) memset(dp,i,sizeof(dp))
#define all(x) begin(x),end(x)
#define unmap unordered_map
#define pii pair<int,int>
#include <bits/stdc++.h>
#define pll pair<ll,ll>
#define vll vector<ll>
#define vi vector<int>
#define ld long double
#define ll long long
#define pb push_back
#define sh short int
#define mid (l+r)/2
#define S second
#define F first
#define sqr 447
using namespace std;
const ll inf = 1e18;
const int mod = 1e9+7;
const ld pai=acos(-1);
ll n,m,q;
ll w[50009];
ll tree[200009];
void build(ll node,ll l,ll r){
    if(l == r) return void(tree[node]=w[l]);
    build(node*2,l,mid),build(node*2+1,mid+1,r);
    tree[node] = min(tree[node*2],tree[node*2+1]);
}
void upd(ll node,ll l,ll r,ll k,ll val){
    if(l == r) return void(tree[node]=val);
    if(k <= mid) upd(node*2,l,mid,k,val);
    else upd(node*2+1,mid+1,r,k,val);
    tree[node] = min(tree[node*2],tree[node*2+1]);
}
ll query(ll node,ll l,ll r,ll s,ll e){
    if(s <= l && e >= r) return tree[node];
    if(s <= mid && e > mid){
        return min(query(node*2,l,mid,s,e),query(node*2+1,mid+1,r,s,e));
    }
    if(s <= mid) return query(node*2,l,mid,s,e);
    return query(node*2+1,mid+1,r,s,e);
}
ll bin1(ll node,ll val){
    ll l = node,r = n;
    while(r-l > 1){
        assert(node <= mid-1 && mid-1 <= n-2);
        if(query(1,0,n-2,node,mid-1) >= val) l = mid;
        else r = mid;
    }
    return l-node;
}
ll bin2(ll node,ll val){
    ll l = -1,r = node;
    while(r-l > 1){
        assert(mid <= node-1 && node-1 >= 0);
        if(query(1,0,n-2,mid,node-1) >= val) r = mid;
        else l = mid;
    }
    return node-r;
}
int main(){
    fast,cin>>n>>m;
    for(int i=0;i<m;i++){
        ll a,b,c;
        cin>>a>>b>>c;
        w[i] = c;
    }
    build(1,0,n-2);
    cin>>q;
    while(q--){
        ll t,a,b;
        cin>>t>>a>>b;
        if(t == 1) upd(1,0,n-2,a-1,b);
        else cout<<bin1(a-1,b)+bin2(a-1,b)+1<<endl;
    }
}

• Subtask 1: 0 / 13
• Subtask 2: 0 / 16
• Subtask 3: 0 / 17
• Subtask 4: 0 / 14
• Subtask 5: 0 / 13
• Subtask 6: 0 / 27