Submission #1105745

#	Time	Username	Problem	Language	Result	Execution time	Memory
1105745		farica	Sjeckanje (COCI21_sjeckanje)	C++14	0 / 110	6 ms	37968 KiB

Main

#include <bits/stdc++.h>
#define int long long

using namespace std;

const int MAX_N = 2e5;
const int MOD = 998244353;

struct Node {
    int ans, prefMax, prefMin, sufMax, sufMin, lazy;
};

Node segm[4*MAX_N];

void push(int pos, int l, int r) {
    segm[pos].prefMax += segm[pos].lazy;
    segm[pos].sufMax += segm[pos].lazy;
    segm[pos].prefMin -= segm[pos].lazy;
    segm[pos].sufMin -= segm[pos].lazy;
    if(l==r) {
        segm[pos].lazy = 0;
        return;
    }
    segm[2*pos+1].lazy += segm[pos].lazy;
    segm[2*pos+2].lazy += segm[pos].lazy;
    segm[pos].lazy = 0;
}

void calc(int pos, int l, int r) {
    if(l==r) {
        segm[pos].ans = 0;
        return;
    }
    int m = (l+r)/2;
    push(2*pos+1, l, m);
    push(2*pos+2, m+1, r);
    segm[pos].ans = segm[2*pos+1].ans + segm[2*pos+2].ans;
    segm[pos].ans = max(segm[pos].ans, segm[2*pos+1].sufMin + segm[2*pos+2].prefMax);
    segm[pos].ans = max(segm[pos].ans, segm[2*pos+1].sufMax + segm[2*pos+2].prefMin);
    segm[pos].prefMin = max(segm[2*pos+1].prefMin + segm[2*pos+2].ans, segm[2*pos+2].prefMin);
    segm[pos].prefMax = max(segm[2*pos+1].prefMax + segm[2*pos+2].ans, segm[2*pos+2].prefMax);
    segm[pos].sufMin = max(segm[2*pos+2].sufMin + segm[2*pos+1].ans, segm[2*pos+1].sufMin);
    segm[pos].sufMax = max(segm[2*pos+2].sufMax + segm[2*pos+1].ans, segm[2*pos+1].sufMax);
}

void update(int pos, int l, int r, int L, int R, int val) {
    if(l >= L && r <= R) segm[pos].lazy += val;
    push(pos, l, r);
    if(l < L or r > R) {
        int m = (l+r)/2;
        if(m >= L) update(2*pos+1, l, m, L, R, val);
        if(m+1 <= R) update(2*pos+2, m+1, r, L, R, val);
    }
    calc(pos, l, r);
}

void solve() {
    for(int i=0; i<4*MAX_N; ++i) segm[i].ans = segm[i].lazy = segm[i].prefMax = segm[i].prefMin = segm[i].sufMax = segm[i].sufMin = 0;
    int n, q;
    cin >> n >> q;
    for(int i=0; i<n; ++i) {
        int x;
        cin >> x;
        update(1, 0, n-1, i, i, x);
    }
    while(q--) {
        int l, r, x;
        cin >> l >> r >> x;
        --l, --r;
        update(1, 0, n-1, l, r, x);
        cout << segm[1].ans << endl;
    }
}

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);

    int t = 1;
    while(t--) solve();

    return 0;
}

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