oj.uz

Submission #810499

# Submission time Handle Problem Language Result Execution time Memory
810499 2023-08-06T10:28:19 Z AkramElOmrani Ideal city (IOI12_city) C++17
0 / 100
 507 ms 852 KB 
#include <bits/stdc++.h>
using namespace std;

template<typename A, typename B> ostream& operator<<(ostream &os, const pair<A, B> &p) { return os << '(' << p.first << ", " << p.second << ')'; }
template<typename T_container, typename T = typename enable_if<!is_same<T_container, string>::value, typename T_container::value_type>::type> ostream& operator<<(ostream &os, const T_container &v) { os << '{'; string sep; for (const T &x : v) os << sep << x, sep = ", "; return os << '}'; }
 
void dbg_out() { cerr << endl; }
template<typename Head, typename... Tail> void dbg_out(Head H, Tail... T) { cerr << ' ' << H; dbg_out(T...); }
#define dbg(...) cerr << "(" << #__VA_ARGS__ << "):", dbg_out(__VA_ARGS__);

const int mod = 1e9;
void add(int& a, int b) {
  a += b;
  if(a > mod) {
	a -= mod;
  }
}
vector<pair<int, int>> dir = {{-1, 0}, {1, 0}, {0, 1}, {0, -1}};

int DistanceSum(int n, int *X, int *Y) {
	int sum = 0;
	// map<pair<int, int>, int> mp;
	// for(int i = 0; i < n; ++i) {
	// 	mp[{X[i], Y[i]}] = i;
	// }
	vector<pair<int, int>> v;
	for(int i = 0; i < n; ++i) {
		v.emplace_back(X[i], Y[i]);
	}
	const int INF = 1e9 + 5;
	int ops = 0;
	int ans = 0;
	// O(n^2)?
	for(int i = 0; i < n; ++i) {
	// start a bfs
	vector<int> dist(n, INF);
	queue<int> q;
	q.push(i);
	dist[i] = 0;
	while(!q.empty()) {
	  int sz = q.size();
	  for(int i = 0; i < sz; ++i) {
	  	ops++;
		int p = q.front(); q.pop();
		for(auto[row, col] : dir) {
		  row += X[p];
		  col += Y[p];
		  auto it = lower_bound(v.begin(), v.end(), make_pair(row, col));
		  if(it == v.end() || *it != make_pair(row, col)) continue;
		  int i = it - v.begin();
		  if(dist[i] != INF) continue;
		  dist[i] = dist[p] + 1;
		  q.push(i);
		}
	  }
	}
	for(int j = i + 1; j < n; ++j) {
	  add(ans, dist[j]);
	}
  }
  assert(ops <= n * n);
  return ans;
}

Compilation message

city.cpp: In function 'int DistanceSum(int, int*, int*)':
city.cpp:22:6: warning: unused variable 'sum' [-Wunused-variable]
   22 |  int sum = 0;
      |      ^~~

Subtask #1
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Incorrect 1 ms 212 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 21.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 507 ms 852 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 45.0

# Verdict Execution time Memory Grader output
1 Incorrect 498 ms 852 KB Output isn't correct
2 Halted 0 ms 0 KB -