Submission #1205778

#	Time	Username	Problem	Language	Result	Execution time	Memory
1205778		Andrey	Sphinx's Riddle (IOI24_sphinx)	C++20	0 / 100	0 ms	436 KiB

sphinx

#include "sphinx.h"
#include<bits/stdc++.h>
using namespace std;

int n;
vector<int> haha[300];
vector<int> bruh(300);
vector<int> col[300];
vector<int> no[300];
vector<int> odd(0);
vector<int> even(0);

void dfs(int a) {
    bruh[a] = -1;
    for(int v: haha[a]) {
        if(bruh[v] != -1) {
            dfs(v);
        }
    }
}

int dude(vector<int> wut) {
    vector<int> yo(n,n);
    for(int i = 0; i < n; i++) {
        bruh[i] = 0;
    }
    for(int v: wut) {
        yo[v] = -1;
        bruh[v] = -1;
    }
    int ans = perform_experiment(yo);
    for(int i = 0; i < n; i++) {
        if(bruh[i] != -1) {
            dfs(i);
            ans--;
        }
    }
    return ans;
}

void dfs2(int a, int d) {
    if(d%2 == 0) {
        even.push_back(a);
    }
    else {
        odd.push_back(a);
    }
    bruh[a] = -1;
    for(int v: no[a]) {
        if(bruh[v] == 0) {
            dfs2(v,d+1);
        }
    }
}

void dfs3(int a, int c) {
    bruh[a] = -1;
    for(int v: no[a]) {
        if(bruh[v] == c) {
            dfs3(v,c);
        }
    }
}

bool calc(int p, int c, vector<int> wut) {
    if(wut.empty()) {
        return false;
    }
    vector<int> yo(n,-1);
    if(p == 0) {
        for(int v: odd) {
            yo[v] = c;
        }
        for(int v: even) {
            yo[v] = n;
        }
    }
    else {
        for(int v: even) {
            yo[v] = c;
        }
        for(int v: odd) {
            yo[v] = n;
        }
    }
    for(int v: wut) {
        yo[v] = -1;
    }
    for(int i = 0; i < n; i++) {
        bruh[i] = yo[i];
    }
    int br = wut.size();
    for(int i = 0; i < n; i++) {
        if(bruh[i] != -1) {
            dfs3(i,bruh[i]);
            br++;
        }
    }
    vector<int> ans(n,-1);
    for(int i = 0; i < n; i++) {
        for(int v: col[i]) {
            ans[v] = yo[i];
        }
    }
    if(perform_experiment(ans) != br) {
        return true;
    }
    else {
        return false;
    }
}

int apple(int p, int c, vector<int> wut) {
    if(wut.size() == 1) {
        return wut[0];
    }
    int mid = wut.size()/2;
    vector<int> wow(0);
    vector<int> yay(0);
    for(int i = 0; i < mid; i++) {
        wow.push_back(wut[i]);
    }
    for(int i = mid; i < wut.size(); i++) {
        yay.push_back(wut[i]);
    }
    if(calc(p,c,wow)) {
        return apple(p,c,wow);
    }
    else {
        return apple(p,c,yay);
    }
}

std::vector<int> find_colours(int N, std::vector<int> x, std::vector<int> y) {
    n = N;
    for(int i = 0; i < x.size(); i++) {
        haha[x[i]].push_back(y[i]);
        haha[y[i]].push_back(x[i]);
    }
    vector<int> ans(n);
    for(int i = 1; i < n; i++) {
        ans[i] = i;
        vector<int> wut(0);
        set<int> idk;
        for(int j = 0; j <= i; j++) {
            wut.push_back(j);
            if(j < i) {
                idk.insert(ans[j]);
            }
        }
        int c = (int)idk.size()-dude(wut)+1;
        for(int j = 0; j < c; j++) {
            int l = 0,r = i-1;
            while(l < r) {
                int mid = (l+r)/2;
                wut.clear();
                idk.clear();
                for(int k = 0; k < i; k++) {
                    if(ans[k] >= l && ans[k] <= mid) {
                        wut.push_back(k);
                        idk.insert(ans[k]);
                    }
                }
                wut.push_back(i);
                if(dude(wut) <= idk.size()) {
                    r = mid;
                }
                else {
                    l = mid+1;
                }
            }
            int a = l;
            for(int k = 0; k < i; k++) {
                if(ans[k] == a) {
                    ans[k] = i;
                }
            }
        }
    }
    for(int i = 0; i < n; i++) {
        col[ans[i]].push_back(i);
    }
    for(int i = 0; i < x.size(); i++) {
        no[ans[x[i]]].push_back(ans[y[i]]);
        no[ans[y[i]]].push_back(ans[x[i]]);
    }
    for(int i = 0; i < n; i++) {
        bruh[i] = 0;
    }
    dfs2(n-1,0);
    vector<int> yeah(n,-1);
    for(int i = 0; i < n; i++) {
        vector<int> wut(0);
        while(true) {
            wut.clear();
            for(int v: even) {
                if(yeah[v] == -1) {
                    wut.push_back(v);
                }
            }
            if(calc(0,i,wut)) {
                yeah[apple(0,i,wut)] = i;
            }
            else {
                break;
            }
        }
        while(true) {
            wut.clear();
            for(int v: odd) {
                if(yeah[v] == -1) {
                    wut.push_back(v);
                }
            }
            if(calc(1,i,wut)) {
                yeah[apple(1,i,wut)] = i;
            }
            else {
                break;
            }
        }
    }
    vector<int> ans2(n);
    for(int i = 0; i < n; i++) {
        for(int v: col[i]) {
            ans2[v] = yeah[i];
        }
    }
    return ans2;
}

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