#include "simurgh.h"
#include <iostream>
#include <algorithm>
#include <cassert>
using namespace std;
#define DG(x) for(int i=0;i<(x).size();++i)cerr<<#x[i]<<" = "<<x[i]<<" ";
const int N = 5e2 + 7;
int used[N];
struct edge {
int ham, x;
};
vector<edge> g[N], ham[N],Nor[N];
vector<int> V, U;
bool is_it_in_T[N*N],Found[N*N];
int arj[N],Q[N];
int How[N*N];
int di[N];
int n,m;
void get_any(int v, vector<int> &T) {
used[v] = true;
for (auto to:g[v]) {
if (used[to.x])continue;
di[to.x] = di[v] + 1;
T.push_back(to.ham);
is_it_in_T[to.ham] = true;
get_any(to.x, T);
}
}
int par[N];
int find_par(int v) {
return (v == par[v] ? v : par[v] = find_par(par[v]));
}
void Merge(int v, int u) {
v = find_par(v);
u = find_par(u);
if (u != v) {
if (rand() & 1)par[v] = u;
else par[u] = v;
}
}
int Newspantree(vector<int> &cur,vector<int> &T) {
for (int i = 1; i <= n; ++i)par[i] = i;
for (int i = 0; i < cur.size(); ++i)Merge(V[cur[i]], U[cur[i]]);
int hw = 0;
for (int i = 0; i < T.size(); ++i) {
if (find_par(V[T[i]]) == find_par(U[T[i]]))continue;
Merge(V[T[i]], U[T[i]]);
cur.push_back(T[i]);
hw+=Found[T[i]];
}
assert(cur.size() == n - 1);
return hw;
}
vector<int> Cikl;
int curpar[N];
bool gta;
void find_cik(int v,int G,int p) {
if (gta == false) {
used[v] = 1;
for (edge to : g[v]) {
if (to.x == p)continue;
if (gta)return;
if (used[to.x] == 2)continue;
if (is_it_in_T[to.ham] == false)continue;
if (used[to.x] == 0) {
curpar[to.x] = v;
Cikl.push_back(to.ham);
find_cik(to.x, G,v);
if (gta)return;
Cikl.pop_back();
}
else if (used[to.x] == 1 && to.x == G) {
Cikl.push_back(to.ham);
gta = true; return;
}
}
if (gta)return;
for (edge to : g[v]) {
if (to.x == p)continue;
if (used[to.x] == 2)continue;
if (gta)return;
if (is_it_in_T[to.ham] == true)continue;
if (used[to.x] == 0) {
curpar[to.x] = v;
Cikl.push_back(to.ham);
find_cik(to.x, G,v);
if (gta)return;
Cikl.pop_back();
}
else if (used[to.x] == 1 && to.x == G) {
Cikl.push_back(to.ham);
gta = true;return;
}
}
used[v] = 2;
}
}
std::vector<int> find_roads(int n, std::vector<int> u, std::vector<int> v) {
::n = n; ::m = u.size();
U = u; V = v;
for (int i = 0; i < u.size(); ++i) {
g[u[i]].push_back({ i,v[i] });
g[v[i]].push_back({ i,u[i] });
}
std::vector<int> r(n - 1);
vector<int> ans;
vector<int> T;
vector<int> val;
get_any(1, T);
for (int i = 0; i < u.size(); ++i) {
if (is_it_in_T[i] == true) {
if (How[i])continue;
How[i] = true;
memset(used, 0, sizeof(used));
Cikl.clear();
gta = false;
Cikl.push_back(i);
used[(di[u[i]] <= di[v[i]] ? u[i] : v[i])] =1;
find_cik((di[u[i]] >= di[v[i]] ? u[i] : v[i]),( di[u[i]] <= di[v[i]] ? u[i] : v[i]), (di[u[i]] <= di[v[i]] ? u[i] : v[i]));
val.resize(Cikl.size(), 0);
for (int ii = 0; ii < Cikl.size(); ++ii) {
vector<int> cur;
for (int j = 0; j < Cikl.size(); ++j) {
if (ii != j)cur.push_back(Cikl[j]);
}
Newspantree(cur, T);
val[ii] = count_common_roads(cur);
}
int mx = -1e9;int mn = 1e9;
for (int ii = 0; ii < Cikl.size(); ++ii) {
mx = max(mx, val[ii]);
mn = min(mn, val[ii]);
How[Cikl[ii]] = true;
}
if (mx == mn) {
for (int ii = 0; ii < Cikl.size(); ++ii) {
Found[Cikl[ii]] = 1;
}
}
else {
for (int ii = 0; ii < Cikl.size(); ++ii) {
if(mn==val[ii])
Found[Cikl[ii]] = 1;
else
Found[Cikl[ii]] = 0;
}
}
}
}
for (int i = 1; i <= n; ++i) {
vector<int> e;
for (auto to : g[i])e.push_back(to.ham);
int k=Newspantree(e, T);
int gt = count_common_roads(e);
arj[i] = gt - k;
Q[i] = gt - k;
}
memset(used, 0, sizeof(used));
for (int i = 1; i <= n; ++i) {
int ps = -1;
for (int j = 1; j <= n; ++j) {
if (arj[j] == 1 && used[j] == 0) {
ps = j; break;
}
}
if (ps == -1)break;
used[ps] = true;
int hw = 0;
int q = 0;
for(edge to:g[ps]){
if (How[to.ham] == true) {
hw += Found[to.ham];
}
else {
q++;
}
}
if (hw == Q[i]) {
continue;
}
int l = 0, r = q-1;
int mid = l;
int good = l;
while (l <= r) {
mid = (l + r) / 2;
vector<int> e;
int s = 0;
int ok = 0;
for (edge to : g[ps]) {
if (How[to.ham] == true) {
continue;
}
else {
if (l <= s && s <= mid) {
e.push_back(to.ham);
}
s++;
}
}
Newspantree(e, T);
if (count_common_roads(e) == Q[i]) {
good = mid; r = mid-1;
}
else {
good = mid + 1; l = mid + 1;
}
}
int s = 0;
int ok = 0;
for (edge to : g[ps]) {
if (How[to.ham] == true) {
continue;
}
else {
if (s==good) {
arj[to.x]--;
How[to.ham] = 1;
Found[to.ham] = 1;
}
s++;
}
}
}
ans.clear();
for (int i = 0; i < m; ++i) {
if (Found[i] == 1)ans.push_back(i);
}
return ans;
}
Compilation message
simurgh.cpp: In function 'int Newspantree(std::vector<int>&, std::vector<int>&)':
simurgh.cpp:43:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0; i < cur.size(); ++i)Merge(V[cur[i]], U[cur[i]]);
^
simurgh.cpp:45:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0; i < T.size(); ++i) {
^
In file included from /usr/include/c++/5/cassert:43:0,
from simurgh.cpp:4:
simurgh.cpp:51:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
assert(cur.size() == n - 1);
^
simurgh.cpp: In function 'std::vector<int> find_roads(int, std::vector<int>, std::vector<int>)':
simurgh.cpp:101:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0; i < u.size(); ++i) {
^
simurgh.cpp:110:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0; i < u.size(); ++i) {
^
simurgh.cpp:114:32: error: 'memset' was not declared in this scope
memset(used, 0, sizeof(used));
^
simurgh.cpp:121:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int ii = 0; ii < Cikl.size(); ++ii) {
^
simurgh.cpp:123:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int j = 0; j < Cikl.size(); ++j) {
^
simurgh.cpp:130:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int ii = 0; ii < Cikl.size(); ++ii) {
^
simurgh.cpp:136:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int ii = 0; ii < Cikl.size(); ++ii) {
^
simurgh.cpp:141:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int ii = 0; ii < Cikl.size(); ++ii) {
^
simurgh.cpp:158:30: error: 'memset' was not declared in this scope
memset(used, 0, sizeof(used));
^
simurgh.cpp:188:8: warning: unused variable 'ok' [-Wunused-variable]
int ok = 0;
^
simurgh.cpp:209:7: warning: unused variable 'ok' [-Wunused-variable]
int ok = 0;
^
