Submission #1006044

#	Time	Username	Problem	Language	Result	Execution time	Memory
1006044		Vivek_03_	Tracks in the Snow (BOI13_tracks)	C++14	0 / 100	520 ms	142164 KiB

tracks

#include<iostream>
#include<vector>
#include<string>
#include<queue>
#include<algorithm>
#include<set>
#include<map>
#include<unordered_map>
#include<cstdio>
using namespace std;
 
#ifndef LOCAL
#pragma GCC optimize ("Ofast")
#pragma GCC optimize ("unroll-loops")
#pragma GCC target("avx2,popcnt")
#endif
 
#define fastio() ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define pb push_back
#define ppb pop_back
#define mp make_pair
 
typedef long long ll;
typedef unsigned long long ull;
typedef long double lld;
 
#ifndef ONLINE_JUDGE
#define debug(x) cerr << #x <<" "; _print(x); cerr << endl;
#else
#define debug(x)
#endif
 
void _print(ll t) {cerr << t;}
void _print(int t) {cerr << t;}
void _print(string t) {cerr << t;}
void _print(char t) {cerr << t;}
void _print(lld t) {cerr << t;}
void _print(double t) {cerr << t;}
void _print(ull t) {cerr << t;}
void _print(pair<int,int> t) {cerr << t.first << ' '<<t.second;}
 
template <class T> void _print(vector <T> v);
template <class T> void _print(set <T> v);
template <class T> void _print(multiset <T> v);
template <class T> void _print(vector <T> v) {cerr << "[ "; for (T i : v) {_print(i); cerr << " ";} cerr << "]";}
template <class T> void _print(set <T> v) {cerr << "[ "; for (T i : v) {_print(i); cerr << " ";} cerr << "]";}
template <class T> void _print(multiset <T> v) {cerr << "[ "; for (T i : v) {_print(i); cerr << " ";} cerr << "]";}
template <class T, class V> void _print(map <T, V> v) {cerr << "[ "; for (auto i : v) {_print(i); cerr << " ";} cerr << "]";}
template <class T, class V> void _print(unordered_map <T, V> v) {cerr << "[ "; for (auto i : v) {_print(i); cerr << " ";} cerr << "]";}
 
int main()
{
    fastio();
 
    #ifndef ONLINE_JUDGE
        freopen("Error.txt", "w", stderr);
    #endif
    
    int r,c;
    cin>>r>>c;

    vector<vector<int>> v(r, vector<int>(c,-1));

    for(int i=0;i<r;i++)
    {
        for(int j=0;j<c;j++)
        {
            char c;
            cin>>c;

            if(c=='F')
            {
                v[i][j]=1;
            }
            else if(c=='R') v[i][j]=0;
        }
    }

    
    vector<vector<int>> visited(r, vector<int>(c,0));
    int curr=0;

    vector<int> dx{1,0,-1,0};
    vector<int> dy{0,1,0,-1};

    for(int i=0;i<r;i++)
    {
        for(int j=0;j<c;j++)
        {
            if(v[i][j]==-1) continue;

            int id = v[i][j];

            if(visited[i][j]==0)
            {
                queue<pair<int,int>> q;
                q.push({i,j});

                curr++;

                while(q.size())
                {
                    int x = q.front().first, y = q.front().second;
                    q.pop();

                    if(x<0 || x>=r || y<0 || y>=c || visited[x][y] || v[i][j]!=id) continue;

                    visited[x][y] = curr;

                    for(int i=0;i<4;i++)
                    {
                        q.push({x + dx[i], y + dy[i]});
                    }
                }
            }
        }
    }
    cout<<curr+1<<'\n';
}

Compilation message (stderr)

tracks.cpp: In function 'int main()':
tracks.cpp:56:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   56 |         freopen("Error.txt", "w", stderr);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 30
• Subtask 2: 0 / 70