oj.uz

Submission #927184

# Submission time Handle Problem Language Result Execution time Memory
927184 2024-02-14T11:17:31 Z haru09 Tracks in the Snow (BOI13_tracks) C++17
100 / 100
 538 ms 132520 KB 
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define fi first
#define se second
#define task "code"

const int ar=4e3+5;
const ll mod=1e9+7;
int m,n;
int a[ar][ar];
int dx[]={1,-1,0,0};
int dy[]={0,0,1,-1};
deque<pair<int,int>> qu;
bool vs[ar][ar];
int ans=0;
void bfs()
{
    qu.push_back({1,1});
    vs[1][1]=true;
    int last=0;
    while(qu.size())
    {
        pair<int,int> p=qu.front();
        qu.pop_front();
        int u=p.fi;
        int v=p.se;
        if (a[u][v]!=last) ans++;
        last=a[u][v];
        for (int i=0;i<=3;i++)
        {
            int x=u+dx[i];
            int y=v+dy[i];
            if (x<1 || x>m || y<1 || y>n) continue;
            if (a[x][y]==0) continue;
            if (vs[x][y]) continue;
            if (a[x][y]==a[u][v])
            {
                qu.push_front({x,y});
            }
            else qu.push_back({x,y});
            vs[x][y]=true;
        }
    }
    cout<<ans;
}
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    if (fopen(task".inp","r"))
    {
        freopen(task".inp","r",stdin);
        freopen(task".out","w",stdout);
    }
    cin>>m>>n;
    for (int i=1;i<=m;i++)
    {
        for (int j=1;j<=n;j++)
        {
            char x;
            cin>>x;
            if (x=='.') a[i][j]=0;
            else if (x=='R') a[i][j]=1;
            else a[i][j]=2;
        }
    }
    bfs();
}

Compilation message

tracks.cpp: In function 'int main()':
tracks.cpp:53:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   53 |         freopen(task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
tracks.cpp:54:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   54 |         freopen(task".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 12888 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2516 KB Output is correct
4 Correct 7 ms 13012 KB Output is correct
5 Correct 3 ms 7768 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2652 KB Output is correct
8 Correct 1 ms 4700 KB Output is correct
9 Correct 1 ms 4956 KB Output is correct
10 Correct 3 ms 7516 KB Output is correct
11 Correct 3 ms 7260 KB Output is correct
12 Correct 5 ms 7736 KB Output is correct
13 Correct 3 ms 7772 KB Output is correct
14 Correct 4 ms 7772 KB Output is correct
15 Correct 11 ms 12892 KB Output is correct
16 Correct 13 ms 12892 KB Output is correct
17 Correct 10 ms 12636 KB Output is correct
18 Correct 7 ms 12892 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 76376 KB Output is correct
2 Correct 42 ms 29276 KB Output is correct
3 Correct 269 ms 92740 KB Output is correct
4 Correct 73 ms 41556 KB Output is correct
5 Correct 168 ms 69108 KB Output is correct
6 Correct 525 ms 106468 KB Output is correct
7 Correct 13 ms 78684 KB Output is correct
8 Correct 12 ms 76380 KB Output is correct
9 Correct 2 ms 2420 KB Output is correct
10 Correct 1 ms 2648 KB Output is correct
11 Correct 13 ms 78428 KB Output is correct
12 Correct 1 ms 4956 KB Output is correct
13 Correct 42 ms 29268 KB Output is correct
14 Correct 25 ms 21340 KB Output is correct
15 Correct 27 ms 23796 KB Output is correct
16 Correct 21 ms 10844 KB Output is correct
17 Correct 111 ms 44688 KB Output is correct
18 Correct 89 ms 44344 KB Output is correct
19 Correct 75 ms 41532 KB Output is correct
20 Correct 64 ms 38996 KB Output is correct
21 Correct 164 ms 71628 KB Output is correct
22 Correct 186 ms 68944 KB Output is correct
23 Correct 195 ms 57684 KB Output is correct
24 Correct 168 ms 71572 KB Output is correct
25 Correct 421 ms 92828 KB Output is correct
26 Correct 298 ms 132520 KB Output is correct
27 Correct 386 ms 119260 KB Output is correct
28 Correct 538 ms 106376 KB Output is correct
29 Correct 503 ms 104736 KB Output is correct
30 Correct 464 ms 110136 KB Output is correct
31 Correct 448 ms 75688 KB Output is correct
32 Correct 357 ms 108020 KB Output is correct