Submission #1044622

#	Time	Username	Problem	Language	Result	Execution time	Memory
1044622		underwaterkillerwhale	Sjeckanje (COCI21_sjeckanje)	C++17	0 / 110	1 ms	2392 KiB

Main

#include <bits/stdc++.h>
#define ll long long
#define rep(i,m,n) for(int i=(m); i<=(n); i++)
#define reb(i,m,n) for(int i=(m); i>=(n); i--)
#define MP make_pair
#define fs first
#define se second
#define bit(msk, i) ((msk >> i) & 1)
#define iter(id, v) for(auto id : v)
#define SZ(v) (int)v.size()
#define ALL(v) v.begin(),v.end()

using namespace std;

mt19937_64 rd(chrono :: steady_clock :: now ().time_since_epoch().count());
ll Rand (ll l, ll r) { return uniform_int_distribution<ll> (l, r) (rd); }

const int N = 2e5 + 7;
const int Mod = 1e9 + 7;
const ll INF = 1e18;
const ll BASE = 137;

int n, Q;
int a[N];
struct Query {
    int l, r, X;
}qr[N];

struct Segment_Tree {
    struct Node {
        ll f[2][2], ps, ss;
    };
    int m;
    Node st[N << 2];

    void init (int n) {
        m = n;
        rep (i, 1, n << 2) st[i].f[0][1] = st[i].f[1][0] = -INF, st[i].f[1][1] = st[i].f[0][0] = 0;
    }

    Node mer (Node lf, Node rt) {
        Node cur;
        cur.ps = lf.ps;
        cur.ss = rt.ss;
        rep (i, 0, 1)
        rep (t, 0, 1) {
            cur.f[i][t] = -INF;
            rep (j, 0, 1)
            rep (k, 0, 1) {
                if ((lf.ss < 0 && rt.ps > 0) || (lf.ss > 0 && rt.ps < 0)) {
                    if (j != k) cur.f[i][t] = max(cur.f[i][t], lf.f[i][j] + rt.f[k][t]);
                }
                else {
                    cur.f[i][t] = max(cur.f[i][t], lf.f[i][j] + rt.f[k][t]);
                }
            }
        }
        return cur;
    }

    void update (int id, int l, int r, int pos, ll val) {
        if (l > pos || r < pos) return;
        if (l == r) {
            st[id].ps += val;
            st[id].ss += val;
            st[id].f[1][1] = abs(st[id].ps);
            return;
        }
        int mid = l + r >> 1;
        update (id << 1, l, mid, pos, val);
        update (id << 1 | 1, mid + 1, r, pos, val);
        st[id] = mer (st[id << 1], st[id << 1 | 1]);
    }
    void update (int pos, int val) {
        update (1, 1, m, pos, val);
    }
}ST;

void solution () {
    cin >> n >> Q;
    rep (i, 1, n) cin >> a[i];
    ST.init(n - 1);
    rep (i, 1, n - 1) ST.update (i, a[i + 1] - a[i]);
    rep (q, 1, Q) {
        cin >> qr[q].l >> qr[q].r >> qr[q].X;
        ST.update(qr[q].l - 1, qr[q].X);
        ST.update(qr[q].r, -qr[q].X);
        ll res = 0;
        rep (i, 0, 1)
        rep (j, 0, 1)
            res = max(res, ST.st[1].f[i][j]);
        cout << res<<"\n";
    }
}

#define file(name) freopen(name".inp","r",stdin); \
freopen(name".out","w",stdout);
int main () {
//    file("c");
    ios_base :: sync_with_stdio(false); cin.tie(0); cout.tie(0);
    int num_Test = 1;
//    cin >> num_Test;
    while (num_Test--)
        solution();
}
/*
no bug challenge +2
4
1 2 3 4
2
0 3
2 1
*/

Compilation message (stderr)

Main.cpp: In member function 'void Segment_Tree::update(int, int, int, int, long long int)':
Main.cpp:69:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   69 |         int mid = l + r >> 1;
      |                   ~~^~~

• Subtask 1: 0 / 15
• Subtask 2: 0 / 40
• Subtask 3: 0 / 55