Submission #1101299

#	Time	Username	Problem	Language	Result	Execution time	Memory
1101299		tsengang	Sterilizing Spray (JOI15_sterilizing)	C++14	100 / 100	872 ms	11908 KiB

sterilizing

#include <bits/stdc++.h>
#define ll long long
#define ff first
#define ss second
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
using namespace std;
ll n,q,k;
struct segtree{
    int n;
    vector<ll>d;
    segtree(ll n){
        d.resize(4*n);
        build(1,1,n);
    }
    void build(ll v,ll l,ll r){
        if(l==r){
            d[v]=0;
            return;
        }
        ll m=(l+r)/2;
        build(v*2,l,m);
        build(v*2+1,m+1,r);
        d[v]=d[v*2]+d[v*2+1];
    }
    ll query(ll v,ll l,ll r,ll L,ll R){
        if(L>R||l>R||L>r) return 0;
        if(L<=l&&r<=R){
            return d[v];
        }
        ll m=(l+r)/2;
        return query(v*2,l,m,L,R)+query(v*2+1,m+1,r,L,R);
    }
    void update(ll v,ll l,ll r,ll pos,ll val){
        if(pos<l||r<pos) return;
        if(l==r){
            d[v]=val;
            return;
        }
        ll m=(l+r)/2;
        update(v*2,l,m,pos,val);
        update(v*2+1,m+1,r,pos,val);
        d[v]=d[v*2]+d[v*2+1];
    }
    void updater(ll node, ll L, ll R, ll l, ll r, ll val){
    if (L > R || L > r || R < l)
        return;
    if (L == R){
        d[node] /= val;
        return;
    }
    ll mid = (L + R) / 2;
    updater(node*2, L, mid, l, r, val);
    updater(node*2 + 1, mid + 1, R, l, r, val);
    d[node] = d[node*2] + d[node*2+1];
    }
    void update2(ll v,ll l,ll r,ll pos){
        if(pos<l||r<pos) return;
        if(l==r){
            d[v]/=k;
            return;
        }
        ll m=(l+r)>>1;
        update2(v*2,l,m,pos);
        update2(v*2+1,m+1,r,pos);
        d[v]=d[v*2]+d[v*2+1];
    }
};
int main() {
    cin >> n >> q >> k;
    ll a[n+2];
    segtree gang(n);
    set<ll>st;
    for(ll i = 1; i <= n; i++){
        cin >> a[i];
        gang.update(1,1,n,i,a[i]);
        if(a[i] > 0) st.insert(i);
    }
    while(q--){
        ll s,x,y;
        cin >> s >> x >> y;
        if(s == 1){
            gang.update(1,1,n,x,y);
            if(y > 0)st.insert(x);
        }
        if(s == 2){
            if(k == 1) continue;
            ll cur = x,i;
            while(!st.empty()){
                auto pos = st.lower_bound(cur);
                if(st.end() == pos || *pos > y)break;
                ll i = *pos;
                gang.update2(1,1,n,i);
                if(gang.query(1,1,n,i,i) == 0){
                    st.erase(i);
                }
                cur = *pos+1;
            }
        }
        if(s == 3){
            cout << gang.query(1,1,n,x,y) << '\n';
        }
    }
}

Compilation message (stderr)

sterilizing.cpp: In function 'int main()':
sterilizing.cpp:88:24: warning: unused variable 'i' [-Wunused-variable]
   88 |             ll cur = x,i;
      |                        ^

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 75 / 75