Submission #758290

#	Time	Username	Problem	Language	Result	Execution time	Memory
758290		teokakabadze	Sjeckanje (COCI21_sjeckanje)	C++17	110 / 110	826 ms	29604 KiB

Main

#include<bits/stdc++.h>
#define f first
#define s second
#define pb push_back
#define int long long
#define N 500002
#define M 1000000007
#define pii pair<int, int>
#define piii pair<pii, int>
using namespace std;

int n, t[4 * N][2][2], d[N], a[N], q;

void build(int v, int l, int r)
{
    int i, j, k, p;
    if(l == r) { t[v][1][1] = abs(d[l]); return; }
    int m = (l + r) / 2;
    build(v * 2, l, m);
    build(v * 2 + 1, m + 1, r);
    for(i = 0; i < 2; i++)
    for(j = 0; j < 2; j++)
    for(k = 0; k < 2; k++)
    for(p = 0; p < 2; p++)
    {
        if(k && p && d[m] * d[m + 1] < 0) continue;
        t[v][i][j] = max(t[v][i][j], t[v * 2][i][k] + t[v * 2 + 1][p][j]);
    }
     //cout << l << ' ' << r << ' ' << t[v][0][0] << ' ' << t[v][0][1] << ' ' << t[v][1][0] << ' ' << t[v][1][1] << '\n';
}

void update(int v, int l, int r, int ind, int val)
{
    int i, j, k, p;
    if(l == r) { t[v][1][1] = abs(val); return; }
    int m = (l + r) / 2;
    if(ind <= m) update(v * 2, l, m, ind, val);
    else update(v * 2 + 1, m + 1, r, ind, val);
    for(i = 0; i < 2; i++)
    for(j = 0; j < 2; j++)
    {
        t[v][i][j] = 0;
        for(k = 0; k < 2; k++)
        for(p = 0; p < 2; p++)
        {
            if(k && p && d[m] * d[m + 1] < 0) continue;
            t[v][i][j] = max(t[v][i][j], t[v * 2][i][k] + t[v * 2 + 1][p][j]);
        }
    }
   // cout << l << ' ' << r << ' ' << t[v][0][0] << ' ' << t[v][0][1] << ' ' << t[v][1][0] << ' ' << t[v][1][1] << '\n';
}

main()
{
    std::ios::sync_with_stdio(0);
    cin.tie();
    
    int l, r, x, i;
    cin >> n >> q;
    for(i = 1; i <= n; i++)
    {
        cin >> a[i];
        d[i] = a[i] - a[i - 1];
    }
    build(1, 2, n);
    while(q--)
    {
        cin >> l >> r >> x;
        d[l] += x, d[r + 1] -= x;
        if(l != 1) update(1, 2, n, l, d[l]);
        if(r != n) update(1, 2, n, r + 1, d[r + 1]);
        cout << max(t[1][0][0], max(t[1][0][1], max(t[1][1][0], t[1][1][1]))) << '\n';
    }
}

Compilation message (stderr)

Main.cpp:53:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   53 | main()
      | ^~~~

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