Submission #1042736

#	Time	Username	Problem	Language	Result	Execution time	Memory
1042736		ilovveyyou	Money (IZhO17_money)	C++14	100 / 100	288 ms	30656 KiB

money

#include <bits/stdc++.h>

using namespace std;

#define fi first
#define se second
#define ll long long
#define pll pair<ll, ll>
#define pii pair<int, int>
#define mp(x, y) make_pair(x, y)
#define sz(v) ((int) (v).size())
#define all(v) (v).begin(), (v).end()
#define MASK(i) (1LL << (i))
#define BIT(x, y) (((x) >> (y)) & 1)
#define clz __builtin_clzll
#define ctz __builtin_ctzll
#define popcount __builtin_popcount
#define lg(x) (63 - clz(x))

template <class X, class Y>
    inline bool maximize(X &x, Y y) {
        return (x < y ? x = y, true : false);
    }
template <class X, class Y>
    inline bool minimize(X &x, Y y) {
        return (x > y ? x = y, true : false);
    }
template <class X>
    inline void compress(vector<X> &a) {
        sort(all(a)); a.resize(unique(all(a)) - a.begin());
    }

const ll oo = (ll) 1e18, inf = (ll) 1e9, mod = (ll) 1e9 + 7;
const int mxn = (int) 1e6 + 10, S = (int) 450, S2 = (int) 450, lg = (int) 18;

void add(ll &x, ll y) {
    x += y;
    if (x >= mod) x -= mod;
}

void sub(ll &x, ll y) {
    x -= y;
    if (x < 0) x += mod;
}

int n;
int a[mxn];

namespace one {
    bool one() {
        return n <= 1e3;
    }

    const int mxn = (int) 1e3 + 5;
    int f[mxn];
    vector<int> cur[mxn];

    void solve() {
        memset(f, 0x3f, sizeof f);
        f[0] = 0;
        for (int i = 1; i <= n; ++i) {
            for (int j = 1; j <= i; ++j)
                cur[i].push_back(a[j]);
            compress(cur[i]);
        }
        for (int i = 1; i <= n; ++i) {
            f[i] = f[i-1] + 1;
            for (int j = i-1; j >= 1; --j) {
                if (a[j] > a[j+1]) break;
                if (a[i] == a[j]) {
                    minimize(f[i], f[j-1] + 1);
                    continue;
                }
                int cnt = upper_bound(all(cur[j-1]), a[i] - 1) - lower_bound(all(cur[j-1]), a[j] + 1);
                if (cnt != 0) break;
                minimize(f[i], f[j-1] + 1);
            }
        }
        cout << f[n];

        return;
    }
}

namespace two {

    bool two() {
        return true;
    }

    struct Seg {
        int n;
        vector<int> st;
        Seg(int n) : n(n) {
            st.resize(n << 2);
        }
        void upd(int p, int x) {
            int i = 1;
            for (int l = 1, r = n; l < r; ) {
                int m = (l + r) >> 1;
                if (p > m) {
                    l = m + 1;
                    i = 2 * i + 1;
                }
                else {
                    r = m;
                    i = 2 * i;
                }
            }
            st[i] += x;
            while (i > 1) {
                i >>= 1;
                st[i] = st[2 * i] + st[2 * i + 1];
            }
        }
        int get(int i, int l, int r, int u, int v) {
            if (l > v || r < u) return 0;
            if (l >= u && r <= v) return st[i];
            int m = (l + r) >> 1;
            int L = get(2 * i, l, m, u, v);
            int R = get(2 * i + 1, m + 1, r, u, v);
            return L + R;
        }
        int get(int u, int v) {
            if (u > v) return 0;
            return get(1, 1, n, u, v);
        }
    };

    int f[mxn];

    void solve() {
        int mx = a[max_element(a + 1, a + 1 + n) - a];

        Seg s(mx);

        memset(f, 0x3f, sizeof f);
        f[0] = 0; 
        for (int i = 1, j = 1; i <= n; ++i) {
            while (j < i && a[i] < a[i-1]) {
                s.upd(a[j], 1); j++;
            }
            while (j < i && s.get(a[j] + 1, a[i] - 1) != 0) {
                s.upd(a[j], 1); j++;
            }
            minimize(f[i], f[j-1] + 1);
        }
        cout << f[n];

        return;
    }
}

void solve() {

    cin >> n;
    for (int i = 1; i <= n; ++i)
        cin >> a[i];

    {
        // if (one::one()) return one::solve();
        if (two::two()) return two::solve();
    }

    return;
}


int main() {

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

    #define TASK "task"
    if (fopen(TASK".inp", "r")) {
        freopen(TASK".inp", "r", stdin);
        freopen(TASK".out", "w", stdout);
    }

    int t = 1;
    // cin >> t;
    while (t--) {
        solve();
    }

    return 0;
}

Compilation message (stderr)

money.cpp: In function 'int main()':
money.cpp:176:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  176 |         freopen(TASK".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
money.cpp:177:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  177 |         freopen(TASK".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 16 / 16
• Subtask 3: 20 / 20
• Subtask 4: 55 / 55