This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define ll long long
const int mxN=1e5, mxM=261*mxN;
int n, m, ri, ci;
ll s1[mxM], s2[mxM];
vector<array<int, 2>> ps, adj[mxM];
void ae(int u, int v, int w) {
adj[u].push_back({v, w});
adj[v].push_back({u, w});
}
array<int, 3> bld(vector<array<int, 2>> &ps, int k=30) {
if(!k) {
s1[m++]+=ps.size();
return {m-1, m-1, m-1};
}
if(!ps.size()) {
m+=3;
ae(m-3, m-2, (1<<k)-1);
ae(m-3, m-1, (1<<k)-1);
return {m-3, m-2, m-1};
}
vector<array<int, 2>> np[3];
for(array<int, 2> a : ps)
np[a[0]>>k-1&1|(a[1]>>k-1&1)<<1].push_back(a);
array<int, 3> c[3];
for(int i=0; i<3; ++i)
c[i]=bld(np[i], k-1);
ae(c[0][1], c[1][0], 1);
ae(c[0][2], c[2][0], 1);
return {c[0][0], c[1][1], c[2][2]};
}
void dfs1(int u=0, int p=-1) {
for(array<int, 2> v : adj[u]) {
if(v[0]==p)
continue;
dfs1(v[0], u);
s1[u]+=s1[v[0]];
s2[u]+=s2[v[0]]+s1[v[0]]*v[1];
}
}
ll dfs2(int u=0, int p=-1, ll s2p=s2[0]) {
for(array<int, 2> v : adj[u])
if(v[0]!=p&&s1[v[0]]*2>n)
return dfs2(v[0], u, s2p+(n-2*s1[v[0]])*v[1]);
cout << s2p;
exit(0);
}
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cin >> n;
for(int i=0; i<n; ++i) {
cin >> ri >> ci;
ps.push_back({ri, ci});
}
bld(ps);
dfs1();
dfs2();
}
Compilation message (stderr)
cvenk.cpp: In function 'std::array<int, 3> bld(std::vector<std::array<int, 2> >&, int)':
cvenk.cpp:29:13: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
np[a[0]>>k-1&1|(a[1]>>k-1&1)<<1].push_back(a);
~^~
cvenk.cpp:29:26: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
np[a[0]>>k-1&1|(a[1]>>k-1&1)<<1].push_back(a);
~^~
cvenk.cpp:29:15: warning: suggest parentheses around arithmetic in operand of '|' [-Wparentheses]
np[a[0]>>k-1&1|(a[1]>>k-1&1)<<1].push_back(a);
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