Submission #883631

#	Time	Username	Problem	Language	Result	Execution time	Memory
883631		Yang8on	Sjeckanje (COCI21_sjeckanje)	C++14	0 / 110	1 ms	4440 KiB

Main

#include <bits/stdc++.h>

#define Yang8on Nguyen_Dinh_Son
#define sonphamay Nguyen_Dinh_Son

#define aothtday "Sjeckanje"
#define fi(i, a, b) for(int i = a; i <= b; i++)
#define fid(i, a, b) for(int i = a; i >= b; i--)
#define ll long long
#define endl '\n'
#define pii pair<int, ll>
#define vi vector<int>
#define pb push_back
#define all(v) v.begin(), v.end()
#define F first
#define S second
#define maxn 200005
#define maxm
#define maxx
#define mod 1000000007
#define base 311
#define ModHas 1000000003ll
#define gb(i, j) ((i >> j) & 1)

using namespace std;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

ll GetRandom(ll l, ll r)
{
    return uniform_int_distribution<ll> (l, r)(rng);
}

int n, q;
ll a[maxn], d[maxn], dp[maxn];
struct dl
{
    ll op_op, op_cl, cl_op, cl_cl;

    void cb(dl x, dl y, int mid)
    {
        op_op = max(x.op_op + y.cl_op, x.op_cl + y.op_op);
        op_cl = max(x.op_op + y.cl_cl, x.op_cl + y.op_cl);
        cl_op = max(x.cl_op + y.cl_op, x.cl_cl + y.op_op);
        cl_cl = max(x.cl_op + y.cl_op, x.cl_cl + y.op_cl);

        if((d[mid] < 0 && d[mid + 1] < 0) || (d[mid] >= 0 & d[mid + 1] >= 0))
        {
            op_op = max(x.op_op, x.op_cl) + max(y.op_op, y.cl_op);
            op_cl = max(x.op_op, x.op_cl) + max(y.op_cl, y.cl_cl);
            cl_op = max(x.cl_op, x.cl_cl) + max(y.cl_op, y.op_op);
            cl_cl = max(x.cl_op, x.cl_cl) + max(y.op_cl, y.cl_cl);
        }
    }

} st[4 * maxn];

void built(int id = 1, int l = 1, int r = n - 1)
{
    if(l == r)
    {
        st[id].op_op = abs(d[l]);
        return ;
    }

    int mid = (l + r) >> 1;

    built(id * 2, l, mid);
    built(id * 2 + 1, mid + 1, r);

    st[id].cb(st[id * 2], st[id * 2 + 1], mid);
}

void update(int pos, int id = 1, int l = 1, int r = n - 1)
{
    if(pos < l || r < pos) return ;
    if(l == r)
    {
        st[id].op_op = abs(d[pos]), st[id].cl_cl = st[id].cl_op = st[id].op_cl = 0;
        return ;
    }

    int mid = (l + r) >> 1;

    update(pos, id * 2, l, mid);
    update(pos, id * 2 + 1, mid + 1, r);

    st[id].cb(st[id * 2], st[id * 2 + 1], mid);
}

void solve()
{
    cin >> n >> q;
    fi(i, 1, n) cin >> a[i];
    fi(i, 1, n - 1) d[i] = a[i] - a[i + 1];
//    n = GetRandom(10, 10), q = GetRandom(1, 1);
//    cout << n << ' ' << q << '\n';
//    fi(i, 1, n) a[i] = GetRandom(1, 10), cout << a[i] << ' ' ;
//    cout << '\n';

    fi(i, 1, n - 1) d[i] = a[i] - a[i + 1];

    built();

    fi(_, 1, q)
    {
        int l, r;
        ll x;
        cin >> l >> r >> x;
//        l = GetRandom(1, n), r = GetRandom(1, n), x = GetRandom(1, 10);
//        if(l > r) swap(l, r);
//        cout << l << ' ' << r << ' ' << x << ' ' << "ANS" << ' ';

        if(l - 1 != 0)
        {
            d[l - 1] -= x;
            update(l - 1);
        }

        if(r != n)
        {
            d[r] += x;
            update(r);
        }

        cout << max({st[1].op_op, st[1].op_cl, st[1].cl_op, st[1].cl_cl}) << '\n';
//        fi(i, l, r) a[i] += x;
//        fi(i, 1, n) fi(j, 1, i) dp[i] = max(dp[i], abs(a[i] - a[j]) + dp[j - 1]);

//        cout << dp[n] << ' ' << max({st[1].op_op, st[1].op_cl, st[1].cl_op, st[1].cl_cl}) << '\n';

//        fi(i, 1, n) dp[i] = 0;
    }
//    cout << max({st[1].op_op, st[1].op_cl, st[1].cl_op, st[1].cl_cl});
}

int main()
{
    if(fopen(aothtday".inp", "r"))
    {
        freopen(aothtday".inp","r",stdin);
        freopen(aothtday".out","w",stdout);
    }

    ios_base::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);

    int nTest = 1;
//    cin >> nTest;

    while(nTest --)
    {
        solve();
    }

    return 0;
}

Compilation message (stderr)

Main.cpp: In member function 'void dl::cb(dl, dl, int)':
Main.cpp:47:54: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
   47 |         if((d[mid] < 0 && d[mid + 1] < 0) || (d[mid] >= 0 & d[mid + 1] >= 0))
      |                                               ~~~~~~~^~~~
Main.cpp: In function 'int main()':
Main.cpp:141:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  141 |         freopen(aothtday".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:142:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  142 |         freopen(aothtday".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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