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답안 #851706

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
851706 2023-09-20T12:12:20 Z bachhoangxuan Triangle Collection (CCO23_day2problem3) C++17
25 / 25
 1623 ms 88496 KB 
// Judges with GCC >= 12 only needs Ofast
// #pragma GCC optimize("O3,no-stack-protector,fast-math,unroll-loops,tree-vectorize")
// MLE optimization
// #pragma GCC optimize("conserve-stack")
// Old judges
// #pragma GCC target("sse4.2,popcnt,lzcnt,abm,mmx,fma,bmi,bmi2")
// New judges. Test with assert(__builtin_cpu_supports("avx2"));
// #pragma GCC target("avx2,popcnt,lzcnt,abm,bmi,bmi2,fma,tune=native")
// Atcoder
// #pragma GCC target("avx2,popcnt,lzcnt,abm,bmi,bmi2,fma")
/*
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;
- insert(x),erase(x)
- find_by_order(k): return iterator to the k-th smallest element
- order_of_key(x): the number of elements that are strictly smaller
*/

#include<bits/stdc++.h>
using namespace std;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
uniform_real_distribution<> pp(0.0,1.0);
#define int long long
#define ld long double
#define pii pair<int,int>
#define piii pair<int,pii>
#define mpp make_pair
#define fi first
#define se second
const int inf=1e18;
const int mod=998244353;
const int maxn=200005;
const int bl=650;
const int maxs=655;
const int maxm=200005;
const int maxq=1000005;
const int maxl=20;
const int maxa=1000000;
const int root=3;
int power(int a,int n){
    int res=1;
    while(n){
        if(n&1) res=res*a%mod;
        a=a*a%mod;n>>=1;
    }
    return res;
};
const int iroot=power(3,mod-2);
const int base=101;
struct node{
    int Min=0,sum=0;
    node(int cur=0,int val=0){
        sum=val;
        Min=min(cur,0LL);
    }
    friend node operator+(node a,node b){
        return node(min(a.Min,a.sum+b.Min),a.sum+b.sum);
    };
};
struct Segtree{
    node tree[8*maxn];
    void update(int l,int r,int id,int p,int val){
        if(l==r){
            tree[id]=node(val,val);
            return;
        }
        int mid=(l+r)>>1;
        if(p<=mid) update(l,mid,id<<1,p,val);
        else update(mid+1,r,id<<1|1,p,val);
        tree[id]=tree[id<<1]+tree[id<<1|1];
    }
    node query(int l,int r,int id,int tl,int tr){
        if(tr<l || r<tl) return node();
        if(tl<=l && r<=tr) return tree[id];
        int mid=(l+r)>>1;
        return query(l,mid,id<<1,tl,tr)+query(mid+1,r,id<<1|1,tl,tr);
    }
}ST[3];

int n,q,a[maxn],aa[maxn];

namespace BIT{
    int bit[maxn];
    void update(int x,int val){
        x=n-x+1;
        for(int i=x;i<=n;i+=(i&(-i))) bit[i]+=val;
    }
    int query(int x){
        x=n-x+1;
        int res=0;
        for(int i=x;i>=1;i-=(i&(-i))) res+=bit[i];
        return res;
    }
}
/*
ST[0]: total < l
ST[1]: all sticks that odd one out
ST[2]: sticks - total
*/

void update(int i,int val){
    BIT::update(i,val/2-a[i]/2);a[i]=val;
    ST[0].update(1,n,1,i,a[i]);
    ST[1].update(1,n,1,i,a[i]&1);
    val=(2*i-1<=n?(a[2*i-1]&1):0)-(a[i]/2);
    ST[2].update(1,2*n,1,2*i-1,val);
    if(i%2==0) ST[2].update(1,2*n,1,i,a[i]&1);
    else{
        int p=(i+1)/2;
        ST[2].update(1,2*n,1,i,(a[i]&1)-a[p]/2);
    }
}
void solve(){
    cin >> n >> q;
    for(int i=1;i<=n;i++) cin >> aa[i];
    for(int i=n;i>=1;i--) update(i,aa[i]);
    auto check = [&](int mid){
        node cur;
        if(mid-1) cur=ST[0].query(1,n,1,1,mid-1)+ST[1].query(1,n,1,mid,min(2*mid-2,n));
        cur=cur+ST[2].query(1,2*n,1,2*mid-1,2*n);
        return (cur.Min>=0);
    };
    node st,md,en;
    auto check2 = [&](int mid,int p){
        node mm;
        if(p==2) mm=node(a[p-1]-3*mid,a[p-1]-3*mid);
        else{
            node s=node(a[p-1]-2*mid,a[p-1]-2*mid);
            int val=(2*p-3<=n?(a[2*p-3]&1):0LL)-mid;
            node t=node(val,val);
            mm=s+md+t;
        }
        //cout << mid << ' ' << st.Min << ' ' << st.sum << ' ' << mm.Min << ' ' << mm.sum << ' ' << en.sum << ' ' << en.sum << '\n';
        node res=st+mm+en;
        return (res.Min>=0);
    };
    for(int i=1;i<=q;i++){
        int p,d;cin >> p >> d;update(p,a[p]+d);
        int l=1,r=n;p=n+1;
        while(r>=l){
            int mid=(l+r)>>1;
            if(check(mid)) p=mid,r=mid-1;
            else l=mid+1;
        }
        //cout << '*' << p << '\n';
        if(p==1) cout << BIT::query(p) << '\n';
        else{
            if(p>2) st=ST[0].query(1,n,1,1,p-2);
            else st=node();
            if(p<=2*p-4) md=ST[1].query(1,n,1,p,min(2*p-4,n));
            else md=node();
            en=ST[2].query(1,2*n,1,2*p-2,2*n);
            //cout << st.Min << ' ' << st.sum << ' ' << md.Min << ' ' << md.sum << ' ' << en.Min << ' ' << en.sum << '\n';
            int total=BIT::query(p);
            l=1,r=a[p-1]/2;
            int res=0;
            while(l<=r){
                int mid=(l+r)>>1;
                if(check2(mid,p)) res=mid,l=mid+1;
                else r=mid-1;
            }
            //cout << total << '\n';
            cout << total+res << '\n';
        }
    }
}

signed main(){
    //freopen("F.INP","r",stdin);
    //freopen("F.OUT","w",stdout);
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);cout.tie(NULL);
    int test=1;//cin >> test;
    while(test--) solve();
}

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 77912 KB Output is correct
2 Correct 11 ms 77916 KB Output is correct
3 Correct 14 ms 77912 KB Output is correct
4 Correct 13 ms 77912 KB Output is correct
5 Correct 13 ms 77912 KB Output is correct
6 Correct 16 ms 78096 KB Output is correct
7 Correct 15 ms 77912 KB Output is correct
8 Correct 15 ms 77912 KB Output is correct
9 Correct 19 ms 77916 KB Output is correct
10 Correct 16 ms 77912 KB Output is correct
11 Correct 16 ms 77912 KB Output is correct
12 Correct 16 ms 77912 KB Output is correct
13 Correct 15 ms 78168 KB Output is correct
14 Correct 14 ms 77912 KB Output is correct

Subtask #2
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 77912 KB Output is correct
2 Correct 11 ms 77916 KB Output is correct
3 Correct 14 ms 77912 KB Output is correct
4 Correct 13 ms 77912 KB Output is correct
5 Correct 13 ms 77912 KB Output is correct
6 Correct 16 ms 78096 KB Output is correct
7 Correct 15 ms 77912 KB Output is correct
8 Correct 15 ms 77912 KB Output is correct
9 Correct 19 ms 77916 KB Output is correct
10 Correct 16 ms 77912 KB Output is correct
11 Correct 16 ms 77912 KB Output is correct
12 Correct 16 ms 77912 KB Output is correct
13 Correct 15 ms 78168 KB Output is correct
14 Correct 14 ms 77912 KB Output is correct
15 Correct 11 ms 77912 KB Output is correct
16 Correct 11 ms 77912 KB Output is correct
17 Correct 20 ms 78168 KB Output is correct
18 Correct 20 ms 78168 KB Output is correct
19 Correct 17 ms 78168 KB Output is correct
20 Correct 17 ms 78168 KB Output is correct
21 Correct 17 ms 77912 KB Output is correct
22 Correct 17 ms 78168 KB Output is correct
23 Correct 18 ms 78168 KB Output is correct
24 Correct 16 ms 78168 KB Output is correct
25 Correct 17 ms 78424 KB Output is correct
26 Correct 16 ms 78168 KB Output is correct
27 Correct 16 ms 77912 KB Output is correct
28 Correct 11 ms 77912 KB Output is correct

Subtask #3
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 77912 KB Output is correct
2 Correct 15 ms 77912 KB Output is correct
3 Correct 100 ms 79288 KB Output is correct
4 Correct 1344 ms 83856 KB Output is correct
5 Correct 1254 ms 83360 KB Output is correct
6 Correct 1294 ms 83544 KB Output is correct
7 Correct 1356 ms 83676 KB Output is correct

Subtask #4
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 77912 KB Output is correct
2 Correct 18 ms 78172 KB Output is correct
3 Correct 17 ms 78168 KB Output is correct
4 Correct 17 ms 77912 KB Output is correct
5 Correct 1439 ms 84148 KB Output is correct
6 Correct 1532 ms 87196 KB Output is correct
7 Correct 1412 ms 87016 KB Output is correct
8 Correct 1489 ms 86876 KB Output is correct
9 Correct 1479 ms 87104 KB Output is correct

Subtask #5
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 77912 KB Output is correct
2 Correct 11 ms 77916 KB Output is correct
3 Correct 14 ms 77912 KB Output is correct
4 Correct 13 ms 77912 KB Output is correct
5 Correct 13 ms 77912 KB Output is correct
6 Correct 16 ms 78096 KB Output is correct
7 Correct 15 ms 77912 KB Output is correct
8 Correct 15 ms 77912 KB Output is correct
9 Correct 19 ms 77916 KB Output is correct
10 Correct 16 ms 77912 KB Output is correct
11 Correct 16 ms 77912 KB Output is correct
12 Correct 16 ms 77912 KB Output is correct
13 Correct 15 ms 78168 KB Output is correct
14 Correct 14 ms 77912 KB Output is correct
15 Correct 11 ms 77912 KB Output is correct
16 Correct 11 ms 77912 KB Output is correct
17 Correct 20 ms 78168 KB Output is correct
18 Correct 20 ms 78168 KB Output is correct
19 Correct 17 ms 78168 KB Output is correct
20 Correct 17 ms 78168 KB Output is correct
21 Correct 17 ms 77912 KB Output is correct
22 Correct 17 ms 78168 KB Output is correct
23 Correct 18 ms 78168 KB Output is correct
24 Correct 16 ms 78168 KB Output is correct
25 Correct 17 ms 78424 KB Output is correct
26 Correct 16 ms 78168 KB Output is correct
27 Correct 16 ms 77912 KB Output is correct
28 Correct 11 ms 77912 KB Output is correct
29 Correct 16 ms 77912 KB Output is correct
30 Correct 15 ms 77912 KB Output is correct
31 Correct 100 ms 79288 KB Output is correct
32 Correct 1344 ms 83856 KB Output is correct
33 Correct 1254 ms 83360 KB Output is correct
34 Correct 1294 ms 83544 KB Output is correct
35 Correct 1356 ms 83676 KB Output is correct
36 Correct 15 ms 77912 KB Output is correct
37 Correct 18 ms 78172 KB Output is correct
38 Correct 17 ms 78168 KB Output is correct
39 Correct 17 ms 77912 KB Output is correct
40 Correct 1439 ms 84148 KB Output is correct
41 Correct 1532 ms 87196 KB Output is correct
42 Correct 1412 ms 87016 KB Output is correct
43 Correct 1489 ms 86876 KB Output is correct
44 Correct 1479 ms 87104 KB Output is correct
45 Correct 1493 ms 88496 KB Output is correct
46 Correct 1434 ms 86892 KB Output is correct
47 Correct 1530 ms 88148 KB Output is correct
48 Correct 1417 ms 83816 KB Output is correct
49 Correct 1370 ms 86976 KB Output is correct
50 Correct 1623 ms 85576 KB Output is correct
51 Correct 1203 ms 85584 KB Output is correct
52 Correct 1419 ms 88256 KB Output is correct
53 Correct 1114 ms 85416 KB Output is correct
54 Correct 1287 ms 84384 KB Output is correct