Submission #737121

#	Time	Username	Problem	Language	Result	Execution time	Memory
737121		mjhmjh1104	Speedrun (RMI21_speedrun)	C++17	90 / 100	331 ms	988 KiB

speedrun

#include "speedrun.h"
#include <cstdio>
#include <vector>
using namespace std;
 
int n, center;
vector<int> adj[1006];
bool visited[1006];
 
void assign(int x, int y, int z) {
    for (int i = 0; i < 10; i++) setHint(x + 1, y * 10 + i + 1, z & 1 << i ? true : false);
}
 
int get(int y) {
    int ret = 0;
    for (int i = 0; i < 10; i++) ret |= getHint(y * 10 + i + 1) << i;
    return ret;
}

void move(int x) {
    visited[x] = true;
    goTo(x + 1);
}
 
void _dfs(int x, int prev = -1) {
    if (prev == -1) assign(x, 2, 1023);
    else assign(x, 2, prev);
    int pv = -1;
    for (auto &i: adj[x]) if (i != prev) {
        if (pv == -1) assign(x, 0, i);
        else assign(pv, 1, i);
        pv = i;
        _dfs(i, x);
    }
    if (pv == -1) assign(x, 0, 1023);
    else assign(pv, 1, x);
}
 
void assignHints(int subtask, int n, int a[], int b[]) {
    if (subtask == 2) {
        ::n = n;
        for (int i = 1; i < n; i++) {
            adj[a[i] - 1].push_back(b[i] - 1);
            adj[b[i] - 1].push_back(a[i] - 1);
        }
        setHintLen(20);
        if (n == 1) return;
        for (int i = 0; i < n; i++) if ((int)adj[i].size() != 1) center = i;
        for (int i = 0; i < n; i++) assign(i, 0, center);
        assign(center, 1, adj[center][0]);
        for (int i = 0; i < (int)adj[center].size(); i++) assign(adj[center][i], 1, adj[center][(i + 1) % (int)adj[center].size()]);
        return;
    }
    if (subtask == 3) {
        ::n = n;
        for (int i = 1; i < n; i++) {
            adj[a[i] - 1].push_back(b[i] - 1);
            adj[b[i] - 1].push_back(a[i] - 1);
        }
        setHintLen(20);
        for (int i = 0; i < n; i++) for (int j = 0; j < 2; j++) {
            if (j < (int)adj[i].size()) assign(i, j, adj[i][j]);
            else assign(i, j, 1023);
        }
        return;
    }
    ::n = n;
    for (int i = 1; i < n; i++) {
        adj[a[i] - 1].push_back(b[i] - 1);
        adj[b[i] - 1].push_back(a[i] - 1);
    }
    setHintLen(30);
    assign(0, 1, 1023);
    _dfs(0);
}

void connect(int x, int y) {
    adj[x].push_back(y);
    adj[y].push_back(x);
}
 
void dfs(int x, int prev = -1) {
    visited[x] = true;
    if (get(0) != 1023) connect(x, get(0));
    if (get(2) != 1023) connect(x, get(2));
    if (get(2) != 1023 && get(1) != 1023) connect(get(1), get(2));
    for (int i = 0; i < (int)adj[x].size(); i++) if (adj[x][i] != prev && !visited[adj[x][i]]) {
        goTo(adj[x][i] + 1);
        dfs(adj[x][i], x);
        goTo(x + 1);
    }
}

bool notVisited() {
    for (int i = 0; i < n; i++) if (!visited[i]) return true;
    return false;
}

void dfs3(int x, int prev = -1) {
    for (int i = 0; i < 2; i++) if (get(i) != 1023) adj[x].push_back(get(i));
    for (auto &i: adj[x]) if (i != prev) {
        goTo(i + 1);
        dfs3(i, x);
    }
    if (prev != -1) goTo(prev + 1);
}
 
void speedrun(int subtask, int n, int st) {
    if (subtask == 2) {
        ::n = n;
        if (n == 1) return;
        st--;
        visited[st] = true;
        while (notVisited()) {
            int a = get(0), b = get(1);
            if (visited[b]) move(a);
            else move(a), move(b);
        }
        return;
    }
    if (subtask == 3) {
        ::n = n;
        dfs3(st - 1);
        return;
    }
    ::n = n;
    dfs(st - 1);
}

• Subtask 1: 21 / 21
• Subtask 2: 8 / 8
• Subtask 3: 19 / 19
• Subtask 4: 12 / 12
• Subtask 5: 30 / 40