Submission #1200674

#	Time	Username	Problem	Language	Result	Execution time	Memory
1200674		steveonalex	Wombats (IOI13_wombats)	C++20	100 / 100	3603 ms	169252 KiB

wombats

#include "wombats.h"
#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
 
#define MASK(i) (1ULL << (i))
#define GETBIT(mask, i) (((mask) >> (i)) & 1)
#define ALL(v) (v).begin(), (v).end()
 
ll max(ll a, ll b){return (a > b) ? a : b;}
ll min(ll a, ll b){return (a < b) ? a : b;}
ll gcd(ll a, ll b){return __gcd(a, b);}
ll lcm(ll a, ll b){return a / gcd(a, b) * b;}
 
ll LASTBIT(ll mask){return (mask) & (-mask);}
int pop_cnt(ull mask){return __builtin_popcountll(mask);}
int ctz(ull mask){return __builtin_ctzll(mask);}
int logOf(ull mask){return 63 - __builtin_clzll(mask);}
 
mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rngesus(ll l, ll r){return l + (ull) rng() % (r - l + 1);}
double rngesus_d(double l, double r){
    double wow = (double) ((ull) rng()) / ((ull)(0-1));
    return wow * (r - l) + l;
}
 
template <class T1, class T2>
    bool maximize(T1 &a, T2 b){
        if (a < b) {a = b; return true;}
        return false;
    }
 
template <class T1, class T2>
    bool minimize(T1 &a, T2 b){
        if (a > b) {a = b; return true;}
        return false;
    }
 
template <class T>
    void printArr(T container, string separator = " ", string finish = "\n", ostream &out = cout){
        for(auto item: container) out << item << separator;
        out << finish;
    }
 
template <class T>
    void remove_dup(vector<T> &a){
        sort(ALL(a));
        a.resize(unique(ALL(a)) - a.begin());
    }

struct Slice{
    vector<int> hori, verti;
};  

const int R = 5000, C = 200, INF = 1e9 + 69;

struct Node{
    int d[C][C];

    Node(){
        for(int i = 0; i < C; ++i) 
        for(int j = 0; j < C; ++j)
            d[i][j] = INF;
    }
};

const int BLOCK = 16;

int r, c;
int b_r;
vector<Slice> a;
Node produce_node(Slice x){
    vector<int> pref = x.hori; pref.insert(pref.begin(), 0);
    for(int i = 1; i < (int) pref.size(); ++i) pref[i] += pref[i-1];

    Node ans;
    for(int i = 0; i < c; ++i) for(int j = 0; j < c; ++j) {
        ans.d[i][j] = abs(pref[j] - pref[i]) + x.verti[j];
    }
    return ans;
}


Node combine(Node x, Node y){
    Node ans;
    int opt[c][c]; 
    memset(opt, 0, sizeof opt);
    for(int i = c-1; i >= 0; --i) for(int j = 0; j < c; ++j){
        int l = 0, r = c-1;
        if (i < c-1) r = opt[i+1][j];
        if (j > 0) l = opt[i][j-1];

        for(int k = l; k <= r; ++k){
            if (minimize(ans.d[i][j], x.d[i][k] + y.d[k][j]))
                opt[i][j] = k;
        }
    }
    return ans;
}

struct SegmentTree{
    int n;
    vector<Node> a;

    SegmentTree(){}
    SegmentTree(int _n, vector<Node> &b){
        n = _n;
        a.resize(n * 2 + 2);
        build_tree(0, n-1, 1, b);
    }

    int choose_mid(int l,int r){
        int j = logOf(r - l + 1);
        return min(l + MASK(j) - 1, r - MASK(j-1));
    }

    void build_tree(int l, int r, int id, vector<Node> &b){
        if (l == r){
            a[id] = b[l];
            return;
        }
        int mid = choose_mid(l, r);
        build_tree(l, mid, id * 2, b); build_tree(mid+1, r, id * 2 + 1, b);
        a[id] = combine(a[id * 2], a[id * 2 + 1]);
    }


    void update(int i, Node v, int l, int r, int id){
        if (l == r){
            a[id] = v;
            return;
        }
        int mid = choose_mid(l, r);
        if (i <= mid) update(i, v, l, mid, id * 2);
        else update(i, v, mid+1, r, id * 2 + 1);
        a[id] = combine(a[id * 2], a[id * 2 + 1]);
    }

    void update(int i, Node v){
        update(i, v, 0, n-1, 1);
    }
};

SegmentTree st;

void init(int R, int C, int H[5000][200], int V[5000][200]) {
    r = R, c = C;
    for(int i = 0; i < r; ++i){
        a.emplace_back();
        a.back().hori.resize(c-1);
        a.back().verti.resize(c);
        for(int j = 0; j < c - 1; ++j) 
            a.back().hori[j] = H[i][j];
        if (i < r - 1){
            for(int j = 0; j < c; ++j) 
                a.back().verti[j] = V[i][j];
        }
    }

    b_r = (r + BLOCK - 1) / BLOCK;

    vector<Node> b;
    for(int i = 0; i < b_r; ++i){
        int L = i * BLOCK, R = min(r-1, (i+1) * BLOCK - 1);
        Node cur = produce_node(a[L]);
        for(int j = L+1; j <= R; ++j) 
            cur = combine(cur, produce_node(a[j])); 
        b.push_back(cur);
    }

    st = SegmentTree(b_r, b);
}
void changeH(int P, int Q, int W) {
    a[P].hori[Q] = W;

    int b_P = P / BLOCK;
    int L = b_P * BLOCK, R = min(r-1, (b_P + 1) * BLOCK - 1);
    Node b = produce_node(a[L]);
    for(int j = L+1; j <= R; ++j) b = combine(b, produce_node(a[j]));
    st.update(b_P, b);
}

void changeV(int P, int Q, int W) {
    a[P].verti[Q] = W;

    int b_P = P / BLOCK;
    int L = b_P * BLOCK, R = min(r-1, (b_P + 1) * BLOCK - 1);
    Node b = produce_node(a[L]);
    for(int j = L+1; j <= R; ++j) b = combine(b, produce_node(a[j]));
    st.update(b_P, b);
}
int escape(int V1, int V2) {
    return st.a[1].d[V1][V2];
}

• Subtask 1: 9 / 9
• Subtask 2: 12 / 12
• Subtask 3: 16 / 16
• Subtask 4: 18 / 18
• Subtask 5: 21 / 21
• Subtask 6: 24 / 24