Submission #1122723

#	Time	Username	Problem	Language	Result	Execution time	Memory
1122723		aaaaaarroz	Sphinx's Riddle (IOI24_sphinx)	C++20	31 / 100	43 ms	916 KiB

sphinx

#include <bits/stdc++.h>
using namespace std;
int perform_experiment(vector<int> e);
vector<int>alll(int n,vector<int> x,vector<int> y){
	vector<int>color(n);
    for(int i=0;i<n;i++){
	    vector<int>nodos;
	    for(int j=0;j<n;j++){
		    if(j!=i){
		  	    nodos.push_back(j);
		    }
	    }
	    int l=0,r=n-1;
	    while(l<r){
		    int mid=(l+r)/2;
		    vector<int>exp(n,l);
		    exp[i]=-1;
		    int node=0;
		    for(int j=l;j<=mid;j++){
			    exp[nodos[node]]=j;
			    node++;
		    }
		   int experimento=perform_experiment(exp);
		   if(experimento==(mid-l+1)){
			   r=mid;
		   }
		   else{
			   l=mid+1;
		   }
	    }
 	    color[i]=l;
    }
	return color;
}
vector<int> uno(int n, vector<int>& x, vector<int>& y) {
    vector<int> color(n, -1);
    vector<vector<int>> adj(n);
    for (int i = 0; i < x.size(); i++) {
        adj[x[i]].push_back(y[i]);
        adj[y[i]].push_back(x[i]);
    }
    color[0] = 0;
    queue<int> q;
    q.push(0);
    while (!q.empty()) {
        int curr = q.front(); q.pop();
        for (int neighbor : adj[curr]) {
            if (color[neighbor] == -1) {
                vector<int> exp(n, -1);
                exp[curr] = color[curr];
                exp[neighbor] = !color[curr];
                int result = perform_experiment(exp);
                color[neighbor] = (result == 1) ? color[curr] : !color[curr];
                q.push(neighbor);
            }
        }
    }
    return color;
}
vector<int> find_colours(int n,vector<int> x,vector<int> y){
	vector<int>grado(n,0);
	for(int i=0;i<x.size();i++){
		grado[x[i]]++;
		grado[y[i]]++;
	}
	bool all=true;
	for(int i=0;i<n;i++){
		if(grado[i]!=(n-1)){
			all=false;
		}
	}
	if(n<=50){
		vector<int> color(n, -1);
		for (int i = 0; i < n; ++i) {
			for (int c = 0; c < n; ++c){
				vector<int> e(n, c); e[i] = -1;
				int foo = perform_experiment(e);
				if (foo == 1) {
					color[i] = c;
					break;
				}
			}
		}
		return color;
	}
	if(all){
		return alll(n,x,y);
	}
	return uno(n,x,y);
}

• Subtask 0: 0 / 0
• Subtask 1: 3 / 3
• Subtask 2: 7 / 7
• Subtask 3: 0 / 33
• Subtask 4: 21 / 21
• Subtask 5: 0 / 36