Submission #367095

#	Time	Username	Problem	Language	Result	Execution time	Memory
367095		CodePlatina	Sjeckanje (COCI21_sjeckanje)	C++14	110 / 110	337 ms	21508 KiB

Main

#include <iostream>
#include <vector>
#include <algorithm>
#include <utility>
#include <tuple>
#define pii pair<int, int>
#define piii pair<int, pii>
#define pll pair<long long, long long>
#define plll pair<long long, pll>
#define tiii tuple<int, int, int>
#define tlll tuple<long long, long long, long long>
#define tiiii tuple<int, int, int, int>
#define tllll tuple<long long, long long, long long, long long>
#define ff first
#define ss second
#define ee ss.ff
#define rr ss.ss
//#define DEBUG

using namespace std;

long long seg[808080][2][2];

void mrge(int ind)
{
    auto &nd = seg[ind], &x = seg[ind << 1], &y = seg[ind << 1 | 1];
    for(int i = 0; i < 2; ++i)
    {
        for(int j = 0; j < 2; ++j)
        {
            nd[i][j] = max(x[i][0] + y[0][j], x[i][1] + y[1][j]);
        }
    }
}

void init(const int *B, int ind, int s, int e)
{
    if(s + 1 == e)
    {
        if(B[s] < 0) seg[ind][0][0] = -B[s];
        else seg[ind][1][1] = B[s];
        return;
    }

    int mid = s + e >> 1;
    init(B, ind << 1, s, mid);
    init(B, ind << 1 | 1, mid, e);
    mrge(ind);
}

void upd(int ind, int s, int e, int pos, int x)
{
    if(s + 1 == e)
    {
        for(int i = 0; i < 2; ++i) for(int j = 0; j < 2; ++j) seg[ind][i][j] = 0;
        if(x < 0) seg[ind][0][0] = -x;
        else seg[ind][1][1] = x;
        return;
    }

    int mid = s + e >> 1;
    if(pos < mid) upd(ind << 1, s, mid, pos, x);
    else upd(ind << 1 | 1, mid, e, pos, x);
    mrge(ind);
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int n, T; cin >> n >> T;
    int A[n]; for(auto &i : A) cin >> i;
    int B[n - 1]; for(int i = 0; i < n - 1; ++i) B[i] = A[i + 1] - A[i];
    init(B, 1, 0, n - 1);

    #ifdef DEBUG
        cout << endl;
        cout << "seg" << endl;
        for(int i = 0; i < 4 * n; ++i)
        {
            cout << i << ' ';
            for(int j = 0; j < 2; ++j)
                for(int k = 0; k < 2; ++k)
                cout << seg[i][j][k] << ' ';
            cout << endl;
        }
        cout << endl;
    #endif


    while(T--)
    {
        int l, r, x; cin >> l >> r >> x; l -= 2; --r;
        if(l >= 0) upd(1, 0, n - 1, l, B[l] += x);
        if(r < n - 1) upd(1, 0, n - 1, r, B[r] -= x);

        #ifdef DEBUG
            cout << endl;
            cout << "B" << endl;
            for(int i = 0; i < n - 1; ++i) cout << B[i] << ' '; cout << endl;
            cout << endl;
        #endif

        #ifdef DEBUG
            cout << endl;
            cout << "seg" << endl;
            for(int i = 0; i < 4 * n; ++i)
            {
                cout << i << ' ';
                for(int j = 0; j < 2; ++j)
                    for(int k = 0; k < 2; ++k)
                    cout << seg[i][j][k] << ' ';
                cout << endl;
            }
            cout << endl;
        #endif

        cout << max({ seg[1][0][0], seg[1][0][1], seg[1][1][0], seg[1][1][1] }) << '\n';
    }
}

Compilation message (stderr)

Main.cpp: In function 'void init(const int*, int, int, int)':
Main.cpp:45:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   45 |     int mid = s + e >> 1;
      |               ~~^~~
Main.cpp: In function 'void upd(int, int, int, int, int)':
Main.cpp:61:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   61 |     int mid = s + e >> 1;
      |               ~~^~~

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