Submission #1103443

#	Time	Username	Problem	Language	Result	Execution time	Memory
1103443		cccc	Nile (IOI24_nile)	C++17	0 / 100	2067 ms	15560 KiB

nile

#include <bits/stdc++.h>
#include "nile.h"
#define ld long double
#define f(i, a, b) for(int i = a; i <= b; i++)
#define fr(i, a, b) for(int i = a; i >= b; i--)
#define pii pair <int, int>
#define fi first
#define se second
#define pb push_back
#define eb emplace_back
#define in insert
#define arr(x) array <int, x>
#define vvec vector<vector<int>>
#define Keiiiii ios_base :: sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define ___ 1000 * clock() / CLOCKS_PER_SEC

using namespace std;

const int N = 1e5 + 5;
const int mod = 1e9 + 7;
const int inf = 1e16;
int n, q;
long long res;
int s[N], p[N], L[N], R[N];
vector <pii> ee;
arr(3) a[N];
pii t[N];

struct ST
{
    int st[N * 4];
    ST() { memset(st, 0x3f, sizeof st); }
    void up(int i, int l, int r, int x, int y)
    {
        if(x > r || x < l) return;
        if(l == r) { st[i] = y; return; }
        int mid = (l + r) >> 1;
        up(i << 1, l, mid, x, y);
        up(i << 1 | 1, mid + 1, r, x, y);
        st[i] = min(st[i << 1], st[i << 1 | 1]);
    }

    int get(int i, int l, int r, int x, int y)
    {
        if(x > r || y < l) return inf;
        if(x <= l && r <= y) return st[i];
        int mid = (l + r) >> 1;
        return min(get(i << 1, l, mid, x, y), get(i << 1 | 1, mid + 1, r, x, y));
    }
} F[2], G[2];

int Find(int v) { return v == p[v] ? v : p[v] = Find(p[v]); }

int get(int l, int r)
{
    if(l == r) return a[l][1];
    int ans = s[r] - s[l - 1], ex = 0, len = r - l + 1;
    if(len % 2 == 1 && len > 2)
    {
        ex = F[(r - 1) % 2].get(1, 1, n, l, r - 1);
        ex = min(ex, G[r % 2].get(1, 1, n, l + 1, r - 1));
        ex = min({ex, a[l][1] - a[l][2], a[r][1] - a[r][2]});
    }
    return ans + ex;
}

void Us(int u, int v)
{
    u = Find(u); v = Find(v);
    if(u == v) return;
    res -= get(L[u], R[u]) + get(L[v], R[v]);
    L[u] = min(L[u], L[v]); R[u] = max(R[u], R[v]);
    res += get(L[u], R[u]); p[v] = u;
}

vector<long long> calculate_costs(
    vector<int> W, vector<int> A,
    vector<int> B, vector<int> E)
{
    n = W.size(); q = E.size();
    f(i, 1, n) a[i][0] = W[i - 1], a[i][1] = A[i - 1], a[i][2] = B[i - 1];
    f(i, 1, q) t[i].fi = E[i - 1], t[i].se = i;
    vector <long long> cc(q);

    vector <arr(3)> e;
    sort(a + 1, a + n + 1);
    sort(t + 1, t + q + 1);
    f(i, 1, n) p[i] = i, L[i] = R[i] = i;
    res = 0;
    f(i, 1, n)
    {
        res += a[i][1];
        s[i] = s[i - 1] + a[i][2];
        if(i % 2 == 0) F[0].up(1, 1, n, i, a[i][1] - a[i][2]);
        else F[1].up(1, 1, n, i, a[i][1] - a[i][2]);
    }
    f(i, 1, n - 1) e.pb({a[i + 1][0] - a[i][0], i, i + 1});
    f(i, 2, n - 1) ee.eb(a[i + 1][0] - a[i - 1][0], i);
    sort(e.begin(), e.end());
    sort(ee.begin(), ee.end());

    int j = 0, j2 = 0;
    f(i, 1, q)
    {
        auto [d, id] = t[i];
        while(j2 < ee.size() && ee[j2].fi <= d)
        {
            int u = ee[j2].se;
            G[u % 2].up(1, 1, n, u, a[u][1] - a[u][2]);
        }

        while(j < n - 1 && e[j][0] <= d) Us(e[j][1], e[j][2]), j++;
        cc[id - 1] = res;
    }

    return cc;
}

Compilation message (stderr)

nile.cpp:21:17: warning: overflow in conversion from 'double' to 'int' changes value from '1.0e+16' to '2147483647' [-Woverflow]
   21 | const int inf = 1e16;
      |                 ^~~~
nile.cpp: In function 'std::vector<long long int> calculate_costs(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
nile.cpp:106:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  106 |         while(j2 < ee.size() && ee[j2].fi <= d)
      |               ~~~^~~~~~~~~~~

• Subtask 0: 0 / 0
• Subtask 1: 0 / 6
• Subtask 2: 0 / 13
• Subtask 3: 0 / 17
• Subtask 4: 0 / 11
• Subtask 5: 0 / 20
• Subtask 6: 0 / 15
• Subtask 7: 0 / 18