Submission #992164

#	Time	Username	Problem	Language	Result	Execution time	Memory
992164		saddd	ZIGZAG (INOI20_zigzag)	C++17	100 / 100	763 ms	63072 KiB

Main

#include<bits/stdc++.h>
#include<fstream>
using namespace std;
//#pragma GCC optimize("O3")
#define sz(a) (int)a.size()
#define ALL(v) v.begin(), v.end()
#define ALLR(v) v.rbegin(), v.rend()
#define ll long long
#define pb push_back
#define forr(i, a, b) for(int i = a; i < b; i++)
#define dorr(i, a, b) for(int i = a; i >= b; i--)
#define ld long double
#define vt vector
#include<fstream>
#define fi first
#define se second
#define pll pair<ll, ll>
#define pii pair<int, int>
#define mpp make_pair
const ld PI = 3.14159265359, prec = 1e-9;;
//using u128 = __uint128_t;
//const int x[4] = {1, 0, -1, 0};
//const int y[4] = {0, -1, 0, 1};
ll mod = 998244353, pr = 69;
const int mxn = 3e5 + 5, mxq = 1e5 + 5, sq = 1005, mxv = 5e4 + 1, lg = 60;
//const int base = (1 <<18);
const ll inf = 2e9 + 5, neg = -69420, inf2 = 1e14;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
struct ST{
    ll sm[4 * mxn + 1];
    bool lz[4 * mxn + 1];
    void applyy(int nd, int v){
        if(v){
            sm[nd] = -sm[nd]; lz[nd] ^= 1;
        }
    }
    void push(int nd){
        applyy(nd << 1, lz[nd]); applyy(nd << 1 | 1, lz[nd]); lz[nd] = 0;
    }
    void upd(int nd, int l, int r, int id, ll v){
        if(l == r){
            sm[nd] = v; return;
        }
        int mid = (l + r) >> 1;
        push(nd);
        if(id <= mid)upd(nd << 1, l, mid, id, v);
        else upd(nd << 1 | 1, mid + 1, r, id, v);
        sm[nd] = sm[nd << 1] + sm[nd << 1 | 1];
    }
    void upd2(int nd, int l, int r, int ql, int qr){
        if(ql > r || qr < l){
            return;
        }
        if(ql <= l && qr >= r){
            applyy(nd, 1);
            return;
        }
        int mid = (l + r) >> 1;
        push(nd);
        upd2(nd << 1, l, mid, ql, qr); upd2(nd << 1 | 1, mid + 1, r, ql, qr);
        sm[nd] = sm[nd << 1] + sm[nd << 1 | 1];
    }
    ll get(int nd, int l, int r, int ql, int qr){
        if(ql > r || qr < l)return(0);
        if(ql <= l && qr >= r)return(sm[nd]);
        int mid = (l + r) >> 1;
        push(nd);
        return(get(nd << 1, l, mid, ql, qr) + get(nd << 1 | 1, mid + 1, r, ql, qr));
    }
};
ST cool;
int n, q;
ll a[mxn + 1], d[mxn + 1];
int sign(ll x){
    if(x < 0)return(0);
    if(x > 0)return(1);
    return(2);
}
int rev(ll x){
    if(x == 0)return(1);
    if(x == 1)return(0);
    return(2);
}
struct Node{
    ll cnt = 0, pref = 0, suf = 0;
    int vall, valr;
};
Node st[4 * mxn + 1];
ll sm[4 * mxn + 1];
bool lz[4 * mxn + 1];
void applyy(int nd, int v){
    if(v){
        st[nd].vall = rev(st[nd].vall); st[nd].valr = rev(st[nd].valr); lz[nd] ^= 1; 
    }
}
void push(int nd){
    applyy(nd << 1, lz[nd]); applyy(nd << 1 | 1, lz[nd]); lz[nd] = 0;
}
Node comb(Node a, Node b, int l, int mid, int r){
    Node res; 
    res.cnt = a.cnt + b.cnt; res.pref = a.pref; res.suf = b.suf;
    if(a.valr == rev(b.vall) && a.valr != 2){
        res.cnt += a.suf * b.pref;
        if(a.pref == mid - l + 1)res.pref += b.pref;
        if(b.suf == r - mid)res.suf += a.suf;
    }
    res.vall = a.vall; res.valr = b.valr;
    return(res);
}
void upd2(int nd, int l, int r, int ql, int qr){
    if(l > r)return;
    if(ql > r || qr < l){
        return;
    }
    if(ql <= l && qr >= r){
        applyy(nd, 1);
        return;
    }
    int mid = (l + r) >> 1;
    push(nd);
    upd2(nd << 1, l, mid, ql, qr); upd2(nd << 1 | 1, mid + 1, r, ql, qr);
    st[nd] = comb(st[nd << 1], st[nd << 1 | 1], l, mid, r);
}

void upd(int nd, int l, int r, int id){
    if(l > r)return;
    if(l == r){
        if(d[l] == 0){
            st[nd].cnt = st[nd].pref = st[nd].suf = 0;
        }else{
            st[nd].cnt = st[nd].pref = st[nd].suf = 1;
        }
        st[nd].vall = st[nd].valr = sign(d[l]);
        return;
    }
    int mid = (l + r) >> 1;
    push(nd);
    if(id <= mid)upd(nd << 1, l, mid, id); 
    else upd(nd << 1 | 1, mid + 1, r, id);
    st[nd] = comb(st[nd << 1], st[nd << 1 | 1], l, mid, r);
}
Node get(int nd, int l, int r, int ql, int qr){
    assert(l <= r);
    if(ql <= l && qr >= r)return(st[nd]);
    int mid = (l + r) >> 1;
    push(nd);
    if(qr <= mid)return(get(nd << 1, l, mid, ql, qr));
    else if(ql > mid)return(get(nd << 1 | 1, mid + 1, r, ql, qr));
    else return(comb(get(nd << 1, l, mid, ql, qr), get(nd << 1 | 1, mid + 1, r, ql, qr), max(l, ql), mid, min(r, qr)));
}
ll getv(int x){
    return(cool.get(1, 0, n - 1, 0, x - 1));
}
void solve(){  
    cin >> n >> q;
    for(int i = 1; i <= n; i++)cin >> a[i];
    for(int i = 0; i < n; i++){
        d[i] = a[i + 1] - a[i];
        upd(1, 1, n - 1, i); cool.upd(1, 0, n - 1, i, d[i]);
    }
    while(q--){
        char idq; cin >> idq;
        if(idq == '*'){
            int l, r; cin >> l >> r;
            
            d[l - 1] = getv(l) * -1 - getv(l - 1);
            if(r + 1 <= n){
                d[r] = getv(r + 1) - getv(r) * -1;
            }
            if(r + 1 <= n){
                cool.upd(1, 0, n - 1, r, d[r]);
                upd(1, 1, n - 1, r);
            }
            cool.upd(1, 0, n - 1, l - 1, d[l - 1]);
            if(l - 1 >= 1)upd(1, 1, n - 1, l - 1);
            if(l <= r){
                upd2(1, 1, n - 1, l, r - 1); cool.upd2(1, 0, n - 1, l, r - 1);
            }
    
        }else if(idq == '+'){
            int l, r; ll v; cin >> l >> r >> v;
            d[l - 1] = (getv(l) + v) - getv(l - 1);
            if(r + 1 <= n){
                d[r] = getv(r + 1) - (getv(r) + v);
            }
            if(r + 1 <= n){
                cool.upd(1, 0, n - 1, r, d[r]);
                upd(1, 1, n - 1, r);
            }
            cool.upd(1, 0, n - 1, l - 1, d[l - 1]);
            if(l - 1 >= 1)upd(1, 1, n - 1, l - 1);
            
        }else{
            int l, r; cin >> l >> r;
            if(l == r){
                cout << 1 << "\n";
                continue;
            }
            cout << get(1, 1, n - 1, l, r - 1).cnt + r - l + 1 << "\n";
        }
        //for(int i = 1; i <= n; i++)cout << getv(i) << " ";
        //cout << "\n";
    }
}
signed main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    //freopen("TESTROOMS.inp", "r", stdin);
    //freopen("TESTROOMS.out", "w", stdout);
    int tt; tt = 1;
    while(tt--){
        solve();
 
    }
    return(0);
}

• Subtask 1: 8 / 8
• Subtask 2: 42 / 42
• Subtask 3: 35 / 35
• Subtask 4: 15 / 15