Submission #1011793

#	Time	Username	Problem	Language	Result	Execution time	Memory
1011793		Yang8on	Sails (IOI07_sails)	C++14	100 / 100	488 ms	7248 KiB

sails

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

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;
pii a[maxn];

struct dl { int val, lazy; } st[4 * maxn];
void down(int id)
{
    ll t = st[id].lazy;
    st[id * 2].val += t, st[id * 2].lazy += t;
    st[id * 2 + 1].val += t, st[id * 2 + 1].lazy += t;
    st[id].lazy = 0;
}
void update(int u, int v, int id = 1, int l = 1, int r = maxn - 5)
{
    if(v < l || r < u) return ;
    if(u <= l && r <= v) return ++st[id].val, ++st[id].lazy, void();
    int mid = (l + r) >> 1; down(id);
    update(u, v, id * 2, l, mid), update(u, v, id * 2 + 1, mid + 1, r);
    st[id].val = max(st[id * 2].val, st[id * 2 + 1].val);
}
int get(int i, int id = 1, int l = 1, int r = maxn - 5)
{
    if(i < l || r < i) return 0;
    if(l == r) return st[id].val;
    int mid = (l + r) >> 1; down(id);
    return max(get(i, id * 2, l, mid), get(i, id * 2 + 1, mid + 1, r));
}

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

    sort(a + 1, a + n + 1);
//    sort(a + 1, a + n + 1, [](pii x, pii y) {
//        return x.f == y.f ? x.s > y.s : x.f < y.f;
//    });

    for(int i = 1; i <= n; i ++)
    {
        int h, sl; tie(h, sl) = a[i];
        int st = h - sl + 1, val = get(st);

        int l = 1, r = h;
        while(l <= r)
        {
            int mid = (l + r) >> 1;
            if(get(mid) >= val) l = mid + 1;
            else r = mid - 1;
        }
        int R = r;

        l = 1, r = h;
        while(l <= r)
        {
            int mid = (l + r) >> 1;
            if(get(mid) <= val) r = mid - 1;
            else l = mid + 1;
        }
        int L = l;

        update(R + 1, min((R + 1) + sl - 1, h));
        if(h - R < sl)
        {
            sl -= h - R;
            update(L, L + sl - 1);
        }
    }

    ll ans = 0;
    for(int i = 1; i <= maxn - 5; i ++)
    {
        int val = get(i);
        ans += 1ll * val * (val - 1) / 2;
    }
    cout << ans;
}


signed main()
{
    iof();

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

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

    ctime();
    return 0;
}

Compilation message (stderr)

sails.cpp: In function 'void iof()':
sails.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: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 5 / 5
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10
• Subtask 11: 10 / 10