Submission #1011647

#	Time	Username	Problem	Language	Result	Execution time	Memory
1011647		Yang8on	Sjeckanje (COCI21_sjeckanje)	C++14	0 / 110	1 ms	2392 KiB

Main

#include <bits/stdc++.h>
#define Y8o "Sjeckanje"
#define maxn (int) 2e5 + 5
#define ll long long
#define pii pair<int, int>
#define gb(i, j) ((i >> j) & 1)
//#define f first
//#define s second

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);
}
void iof() {
    if(fopen(Y8o".inp", "r"))
    {
        freopen(Y8o".inp", "r", stdin);
//        freopen(Y8o".out", "w", stdout);
    }
    ios_base::sync_with_stdio(0);
    cin.tie(NULL), cout.tie(NULL);
}
void ctime() {
    cerr << "\n" << "\nTime elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << "ms\n";
}


int n, Q;
ll a[maxn], d[maxn];

struct dl {
    ll op_op, op_cl, cl_op, cl_cl;
} st[4 * maxn];

dl change(ll val, dl best = {0, 0, 0, 0}) {
        best = {val, 0, 0, 0};
        return best;
}
dl cb(dl x, dl y, int mid, dl best = {0, 0, 0, 0}) {
        best.op_op = max(x.op_op + y.cl_op, x.op_cl + y.op_op);
        best.op_cl = max(x.op_op + y.cl_cl, x.op_cl + y.op_cl);
        best.cl_op = max(x.cl_op + y.cl_op, x.cl_cl + y.op_op);
        best.cl_cl = max(x.cl_op + y.cl_cl, x.cl_cl + y.op_cl);

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

void build(int id = 1, int l = 1, int r = n - 1)
{
    if(l == r) { st[id] = change(abs(d[l])); return; }
    int mid = (l + r) >> 1;
    build(id * 2, l, mid), build(id * 2 + 1, mid + 1, r);
    st[id] = cb(st[id * 2], st[id * 2 + 1], mid);
}
void update(int i, int id = 1, int l = 1, int r = n - 1)
{
    if(i < l || r < i) return ;
    if(l == r) { st[id] = change(abs(d[i])); return; }
    int mid = (l + r) >> 1;
    update(i, id * 2, l, mid), update(i, id * 2 + 1, mid + 1, r);
    st[id] = cb(st[id * 2], st[id * 2 + 1], mid);
}

ll ans() {
    return max({ st[1].op_op, st[1].op_cl, st[1].cl_op, st[1].cl_cl });
}

void solve()
{
    cin >> n >> Q;
    for(int i = 1; i <= n; i ++) cin >> a[i];
    for(int i = 1; i < n; i ++) d[i] = a[i + 1] - a[i];

    build();
    for(int i = 1; i <= Q; i ++)
    {
        int u, v; ll val;
        cin >> u >> v >> val;
        d[u - 1] += val, d[v] -= val;
        update(u - 1), update(v);
        cout << ans() << '\n';
    }
}


int main()
{
    iof();

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

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

    ctime();
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'void iof()':
Main.cpp:19:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         freopen(Y8o".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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