Submission #541424

#	Time	Username	Problem	Language	Result	Execution time	Memory
541424		AmirElarbi	Ideal city (IOI12_city)	C++14	Compilation error	0 ms	0 KiB

city

#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 mov[4][2] = {{1,0},{0,1},{-1,0},{0,-1}}, d[nax];
bool vis[nax],grid[nax];
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;
        grid[x[i]*mxy+y[i]] = 1;
    }
    for (int i = 0; i < n; ++i)
    {
        queue<ii> q;
        q.push({x[i], y[i]});
        memset(d,0,sizeof d);
        vis[x[i]*mxy + y[i]] = 1;
        while(!q.empty()){
            int x1 = q.front().fi , y1 = q.front().se;
            q.pop();
            for (int j = 0; j < 4; ++j)
            {
                int nx = x1 + mov[j][0], ny = y1 + mov[j][1];
                if(nx < 0 || ny < 0 || nx >= mxx || ny >= mxy || !grid[nx*mxy+ny] || d[nx*mxy + ny] ) continue;
                d[nx*mxy + ny] = d[x1*mxy + y1] + 1;
                if(!vis[nx*mxy + ny])
                    ans += d[nx*mxy + ny];
                ans %= MOD;
                q.push({nx,ny});
            }
        }
    }
    
    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 (stderr)

city.cpp: In function 'int main()':
city.cpp:70:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |         freopen("input.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
city.cpp:71:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |         freopen("output.txt", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccOOcVy5.o: in function `main':
city.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccMPiR64.o:grader.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status