이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include "highway.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
pair<int, int> rootedTree(int N, vector<int> U, vector<int> V, int A, int B, ll dep = 0, int root = 0) { // tree, one is determined (by default 0)
int M = U.size();
vector<int> v(M, 0);
if(dep == 0) dep = ask(v) / A;
vector<vector<pair<int, int>>> adj(N);
for(int i = 0; i < M; i++) {
if(U[i] < 0) {
v[i] = 1;
continue;
}
adj[U[i]].push_back({V[i], i});
adj[V[i]].push_back({U[i], i});
}
queue<pair<int, pair<int, int>>> q;
vector<pair<int, int>> candidates;
vector<bool> taken(N, false);
q.push({0, {root, -1}});
while(q.size()) {
auto p = q.front(); q.pop();
// cout << p.first << ' ' << p.second.first << '\n';
taken[p.second.first] = true;
if(p.first == dep) {
candidates.push_back(p.second);
continue;
}
for(auto g : adj[p.second.first]) {
if(taken[g.first]) continue;
q.push({p.first + 1, g});
}
}
int g = 1;
while((1 << g) < candidates.size()) g++;
ll ans = 0;
for(int i = 0; i < g; i++) {
for(int j = 0; j < candidates.size(); j++) {
if(j & (1 << i)) v[candidates[j].second] = 1;
}
if(ask(v) != dep * A) ans += (1 << i);
for(int j = 0; j < candidates.size(); j++) {
v[candidates[j].second] = 0;
}
}
return {root, candidates[ans].first};
}
pair<int, int> generalTree(int N, vector<int> U, vector<int> V, int A, int B) { // tree
int M = U.size();
vector<int> v(M, 0);
vector<vector<pair<int, int>>> adj(N);
vector<vector<pair<int, int>>> depths(N);
for(int i = 0; i < M; i++) {
if(U[i] < 0) {
v[i] = 1;
continue;
}
adj[U[i]].push_back({V[i], i});
adj[V[i]].push_back({U[i], i});
}
vector<bool> taken(N, false);
queue<pair<int, pair<int, int>>> q;
q.push({0, {0, -1}});
while(q.size()) {
auto p = q.front(); q.pop();
taken[p.second.first] = true;
depths[p.first].push_back(p.second);
for(auto g : adj[p.second.first]) {
if(taken[g.first]) continue;
q.push({p.first + 1, g});
}
}
while(depths.back().size() == 0) depths.pop_back();
ll largeLength = ask(v);
int l = 1, r = depths.size();
while(l != r - 1) {
int mid = (l + r) / 2;
for(int i = mid; i < depths.size(); i++) {
for(auto g : depths[i]) {
v[g.second] = 1;
}
}
if(ask(v) == largeLength) r = mid;
else l = mid;
for(int i = mid; i < depths.size(); i++) {
for(auto g : depths[i]) {
v[g.second] = 0;
}
}
}
int g = 0;
while((1 << g) < depths[l].size()) g++;
int ans = 0;
for(int i = 0; i < g; i++) { // Funny way to divide people into two groups, check for good
for(int j = 0; j < depths[l].size(); j++) {
if((j ^ ans) % (1 << i)) continue;
if(j & (1 << i)) v[depths[l][j].second] = 1;
}
if(ask(v) != largeLength) ans += (1 << i);
for(int j = 0; j < depths[l].size(); j++) {
if((j ^ ans) % (1 << i)) continue;
if(j & (1 << i)) v[depths[l][j].second] = 0;
}
}
// cout << "Determined one of them to be " << depths[l][ans].first << '\n';
return rootedTree(N, U, V, A, B, 0, depths[l][ans].first);
}
void find_pair(int N, vector<int> U, vector<int> V, int A, int B) {
pair<int, int> ans;
if(U.size() + 1 == N) ans = generalTree(N, U, V, A, B);
else {
int M = U.size();
vector<vector<pair<int, int>>> adj(N);
for(int i = 0; i < M; i++) {
if(U[i] < 0) break;
adj[U[i]].push_back({V[i], i});
adj[V[i]].push_back({U[i], i});
}
vector<bool> taken(N, false);
vector<int> depths(N);
queue<pair<int, pair<int, int>>> q;
q.push({0, {0, -1}});
depths[0] = 0;
while(q.size()) {
auto p = q.front(); q.pop();
taken[p.second.first] = true;
for(auto g : adj[p.second.first]) {
if(taken[g.first]) {
if(depths[g.first] > depths[p.second.first]) {
U[p.second.second] = V[p.second.second] = -1;
}
continue;
}
q.push({p.first + 1, g});
depths[g.first] = p.first + 1;
}
}
ans = generalTree(N, U, V, A, B);
}
answer(ans.first, ans.second);
}
컴파일 시 표준 에러 (stderr) 메시지
highway.cpp: In function 'std::pair<int, int> rootedTree(int, std::vector<int>, std::vector<int>, int, int, ll, int)':
highway.cpp:38:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
38 | while((1 << g) < candidates.size()) g++;
| ~~~~~~~~~^~~~~~~~~~~~~~~~~~~
highway.cpp:41:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
41 | for(int j = 0; j < candidates.size(); j++) {
| ~~^~~~~~~~~~~~~~~~~~~
highway.cpp:45:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
45 | for(int j = 0; j < candidates.size(); j++) {
| ~~^~~~~~~~~~~~~~~~~~~
highway.cpp: In function 'std::pair<int, int> generalTree(int, std::vector<int>, std::vector<int>, int, int)':
highway.cpp:82:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
82 | for(int i = mid; i < depths.size(); i++) {
| ~~^~~~~~~~~~~~~~~
highway.cpp:89:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
89 | for(int i = mid; i < depths.size(); i++) {
| ~~^~~~~~~~~~~~~~~
highway.cpp:96:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
96 | while((1 << g) < depths[l].size()) g++;
| ~~~~~~~~~^~~~~~~~~~~~~~~~~~
highway.cpp:99:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
99 | for(int j = 0; j < depths[l].size(); j++) {
| ~~^~~~~~~~~~~~~~~~~~
highway.cpp:104:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
104 | for(int j = 0; j < depths[l].size(); j++) {
| ~~^~~~~~~~~~~~~~~~~~
highway.cpp: In function 'void find_pair(int, std::vector<int>, std::vector<int>, int, int)':
highway.cpp:115:21: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
115 | if(U.size() + 1 == N) ans = generalTree(N, U, V, A, B);
| ~~~~~~~~~~~~~^~~~
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