Submission #957659

#	Time	Username	Problem	Language	Result	Execution time	Memory
957659		vjudge1	Sterilizing Spray (JOI15_sterilizing)	C++17	80 / 100	5077 ms	13160 KiB

sterilizing

#include <bits/stdc++.h>
#define Y8o "Sterilizing Spray"
#define maxn 100005
#define ll long long
#define pii pair<int, int>
#define gb(i, j) ((i >> j) & 1)

using namespace std;

/// okay?
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()   /// ------------------inp_out file!-----------------///
{
    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()   /// ------------------check time!-----------------///
{
    cerr << "\n" << "\nTime elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << "ms\n";
}
/// okay!

int n, Q, k;
int a[maxn];
struct dl
{
    int id, f, s;
} qr[maxn];
pii st[4 * maxn]; /// max + pos
ll st2[4 * maxn]; /// sum

void build(int id = 1, int l = 1, int r = n)
{
    if(l == r)
    {
        st[id] = {a[l], l};
        st2[id] = 1ll * a[l];
        return ;
    }

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

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

    st[id] = max(st[id * 2], st[id * 2 + 1]);
    st2[id] = st2[id * 2] + st2[id * 2 + 1];
}

void update(int i, int val, int id = 1, int l = 1, int r = n)
{
    if(i < l || r < i) return ;
    if(l == r)
    {
        st[id] = {val, l};
        st2[id] = 1ll * val;
        return ;
    }

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

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

    st[id] = max(st[id * 2], st[id * 2 + 1]);
    st2[id] = st2[id * 2] + st2[id * 2 + 1];
}

pii getma(int u, int v, int id = 1, int l = 1, int r = n)
{
    if(v < l || r < u) return {0, 0};
    if(u <= l && r <= v) return st[id];

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

    return max( getma(u, v, id * 2, l, mid), getma(u, v, id * 2 + 1, mid + 1, r) );
}

ll getsum(int u, int v, int id = 1, int l = 1, int r = n)
{
    if(v < l || r < u) return 0;
    if(u <= l && r <= v) return st2[id];

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

    return getsum(u, v, id * 2, l, mid) + getsum(u, v, id * 2 + 1, mid + 1, r);
}

void solve()
{
    cin >> n >> Q >> k;
    for(int i = 1; i <= n; i ++) cin >> a[i];
    for(int i = 1; i <= Q; i ++) cin >> qr[i].id >> qr[i].f >> qr[i].s;

    build();

    for(int i = 1; i <= Q; i ++)
    {
        int id = qr[i].id, u = qr[i].f, v = qr[i].s, l = u, r = v;
        if(id == 1) update(u, v); /// a[u] = v
        else if(id == 2)
        {
            vector<pii> store;

            while(1)
            {
                pii best = getma(l, r);
                if(best.first != 0)
                {
                    store.push_back(best);
                    update(best.second, 0);
                }
                else break;
            }
            for(pii x : store)
            {
                int val = x.first, pos = x.second;
                update(pos, val / k);
            }
            store.clear();
        }
        else cout << getsum(l, r) << '\n';
    }
}


int main()
{
    iof();

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

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

    ctime();
    return 0;
}

Compilation message (stderr)

sterilizing.cpp: In function 'void iof()':
sterilizing.cpp:20:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |         freopen(Y8o".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
sterilizing.cpp:21:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |         freopen(Y8o".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 75 / 75