| # | Submission time | Handle | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 420433 | 2021-06-08T11:12:03 Z | kostia244 | Airline Route Map (JOI18_airline) | C++17 | 0 ms | 0 KB |
#include "Boblib.h"
#include<bits/stdc++.h>
using namespace std;
void Bob( int V, int U, int C[], int D[] ){
if(V < 3 || U == 0) {
InitMap(V, U);
for(int i = 0; i < U; i++)
MakeMap(C[i], D[i]);
return;
}
vector<int> label(3024);
for(int z = 0, i = 0; i < 1000; i++) {
while(z > 1 && !(z&(z-1))) z++;
label[z ? z : 1023] = i;
z++;
}
vector<vector<int>> g(V);
vector<int> real(V, -1);
for(int i = 0; i < U; i++) {
g[C[i]].push_back(D[i]);
g[D[i]].push_back(C[i]);
}
int sun = 0;
while(g[sun].size()!=1) sun++;
sun = g[sun][0];
for(auto i : g[sun]) if(g[i].size()>1)real[i] = 0;
int start = -1, prev = -1;
for(int i = 0; i < V; i++) if(!real[i]) {
int popcnt = -1;
for(int j : g[i]) if(real[j] && j != sun) {
//cout << i << " to " << j<< endl;
if(popcnt == -1) popcnt = j;
if(popcnt != j) popcnt = -2;
}
if(popcnt >= 0) {
//cout << "uwu " << i << " " << popcnt << endl;
start = popcnt;
break;
}
}
//cout << start << "hm\n" << endl;
vector<int> bits {start};
while(bits.size() < 10) {
for(auto i : g[start]) if(real[i] && i != prev) {
prev = start;
start = i;
break;
}
bits.push_back(start);
}
for(int i = 0; i < 10; i++) {
for(int j : g[bits[i]]) if(real[j] != -1)
real[j] += 1<<i;
}
//for(auto i : real) cout << i << " "; cout << endl;
for(int &i : real) if(i != -1) i = label[i];
//for(auto i : real) cout << i << " "; cout << endl;
int ed = 0;
for(int i = 0; i < U; i++)
ed += real[C[i]] >= 0 && real[D[i]] >= 0;
InitMap(V-12, ed );
for(int i = 0; i < U; i++) {
if(real[C[i]] >= 0 && real[D[i]] >= 0)
MakeMap(real[C[i]], real[D[i]]);
}
}