#include <bits/stdc++.h>
#define vi vector<int>
#define ve vector
#define ll long long
#define vf vector<float>
#define vll vector<pair<ll,ll>>
#define ii pair<int,int>
#define pll pair<ll,ll>
#define vvi vector<vi>
#define vii vector<ii>
#define gii greater<ii>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define INF 2e9+5
#define eps 1e-7
#define eps1 1e-25
#define optimise ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define MAX_A 1e5+5
#define V 450
using namespace std;
const int MOD = 1e9;
const int nax = 1e5+5;
int ans = 0;
int mnx = INF,mny = INF, mxx = 0, mxy = 0;
int d[nax];
bool vis[nax];
vi adj[nax];
ve<pair<ii,int>> ed1, ed2;
int DistanceSum(int n, int *x, int *y) {
for (int i = 0; i < n; ++i)
{
mnx = min(mnx,x[i]), mny = min(mny,y[i]);
mxx = max(mxx,x[i]), mxy = max(mxy, y[i]);
}
mxx-=mnx,mxy-=mny;
mxx++,mxy++;
for (int i = 0; i < n; ++i)
{
x[i]-=mnx,y[i]-=mny;
ed1.pb({{x[i],y[i]},i});
ed2.pb({{y[i],x[i]},i});
}
sort(ed1.begin(), ed1.end());
sort(ed2.begin(), ed2.end());
for (int i = 1; i < n; ++i)
{
if(ed1[i].fi.fi == ed1[i-1].fi.fi && ed1[i].fi.se - ed1[i-1].fi.se == 1){
adj[ed1[i].se].pb(ed1[i-1].se);
adj[ed1[i-1].se].pb(ed1[i].se);
}
if(ed2[i].fi.fi == ed2[i-1].fi.fi&& ed2[i].fi.se - ed2[i-1].fi.se == 1){
adj[ed2[i].se].pb(ed2[i-1].se);
adj[ed2[i-1].se].pb(ed2[i].se);
}
}
for (int i = 0; i < n; ++i)
{
queue<int> q;
q.push(i);
memset(d,0,sizeof d);
vis[i] = 1;
while(!q.empty()){
int cur = q.front();
q.pop();
for (auto j : adj[cur])
{
if(d[j] ) continue;
d[j] = d[cur] + 1;
if(!vis[j])
ans += d[j];
ans %= MOD;
q.push(j);
}
}
}
return ans;
}
int main() {
optimise;
#ifndef ONLINE_JUDGE
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#endif
int n;
cin>> n;
int x[n],y[n];
for (int i = 0; i < n; ++i)
{
cin >> x[i] >> y[i];
}
cout << DistanceSum(n,x,y);
}
Compilation message
city.cpp: In function 'int main()':
city.cpp:85:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
85 | freopen("input.txt", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
city.cpp:86:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
86 | freopen("output.txt", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccxtIiMh.o: in function `main':
city.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cc7WYiqe.o:grader.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status
