oj.uz

답안 #270291

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
270291 2020-08-17T13:54:54 Z Killer2501 포탈들 (BOI14_portals) C++14
100 / 100
 869 ms 119864 KB 
#include <bits/stdc++.h>
#define ll int
#define pb push_back
#define fi first
#define se second
#define pll pair<ll, ll>
using namespace std;
const ll N = 1e6 + 5;
const ll mod = 1e9 + 7;
ll n, sum= 0, m, tong, k, ans, T, t;

ll b[N], d[N];
string s;
vector<pll> adj[N];
ll f(ll i, ll j)
{
    return (i-1) * m + j;
}
char c[N];
queue<pll> ds;
void bfs()
{
    while(!ds.empty())
    {
        pll u = ds.front();
        ds.pop();
        int j = (u.se % m == 0) ? m : (u.se % m), i = (u.se - j) / m + 1;
        //cout << i <<" "<<j<<'\n';
        if(i > 1)
        {
            k = f(i-1, j);
            if(b[k] > u.fi + 1)
            {
                b[k] = u.fi + 1;
                ds.push({b[k], k});
            }
        }
        if(j > 1)
        {
            k = f(i, j-1);
            if(b[k] > u.fi + 1)
            {
                b[k] = u.fi + 1;
                ds.push({b[k], k});
            }
        }
        if(i < n)
        {
            k = f(i+1, j);
            if(b[k] > u.fi + 1)
            {
                b[k] = u.fi + 1;
                ds.push({b[k], k});
            }
        }
        if(j < m)
        {
            k = f(i, j+1);
            if(b[k] > u.fi + 1)
            {
                b[k] = u.fi + 1;
                ds.push({b[k], k});
            }
        }
    }
}
inline void sol()
{
    cin >> n >> m;
    ll sa, fn;
    for(int i = 1; i <= n; i ++)
        for(int j = 1; j <= m; j ++)
        {
            k = f(i, j);
            cin >> c[k];
            if(c[k] == 'S')
            {
                sa = k;
            }
            if(c[k] == 'C')
            {
                fn = k;
            }
            b[k] = mod;
            d[k] = mod;
            if(c[k] == '#')
            {
                ds.push({0, k});
                b[k] = 0;
            }

        }
        for(int i = 1; i <= n; i ++)
        {
            for(int j = 1; j <= m; j ++)
            {
            k = f(i, j);
            if(i > 1 && c[f(i-1, j)] != '#')adj[k].pb({1, f(i-1, j)});
            if(j > 1 && c[f(i, j-1)] != '#')adj[k].pb({1, f(i, j-1)});
            if(i < n && c[f(i+1, j)] != '#')adj[k].pb({1, f(i+1, j)});
            if(j < m && c[f(i, j+1)] != '#')adj[k].pb({1, f(i, j+1)});
            }
        }
        for(int i = 1; i <= n; i ++)
        {
            k = f(i, 1);
            if(c[k] != '#')
            {
                b[k] = 1;
                ds.push({b[k], k});
            }
            k = f(i, m);
            if(c[k] != '#')
            {
                b[k] = 1;
                ds.push({b[k], k});
            }
        }
        for(int i = 1; i <= m; i ++)
        {
            k = f(1, i);
            if(c[k] != '#')
            {
                b[k] = 1;
                ds.push({b[k], k});
            }
            k = f(n, i);
            if(c[k] != '#')
            {
                b[k] = 1;
                ds.push({b[k], k});
            }
        }
    bfs();
    for(int i = 1; i <= n; i ++)
    {
        stack<ll> l, r;
        l.push(0);
        r.push(m+1);
        for(int j = 1; j <= m; j ++)
        {
            k = f(i, j);
            //cout << b[k] <<" ";

            t = l.top() + 1;
            adj[k].pb({b[k], f(i, t)});
            if(c[k] == '#')l.push(j);
        }
        //cout << '\n';
        for(int j = m; j > 0; j --)
        {
            k = f(i, j);
            t = r.top() - 1;
            adj[k].pb({b[k], f(i, t)});
            if(c[k] == '#')r.push(j);
        }
    }
    for(int i = 1; i <= m; i ++)
    {
        stack<ll> l, r;
        l.push(0);
        r.push(n+1);
        for(int j = 1; j <= n; j ++)
        {
            k = f(j, i);
            t = l.top() + 1;
            //cout << j <<" "<< i <<" "<<t<<'\n';
            adj[k].pb({b[k], f(t, i)});
            if(c[k] == '#')l.push(j);
        }
        for(int j = n; j > 0; j --)
        {
            k = f(j, i);
            t = r.top() - 1;
            adj[k].pb({b[k], f(t, i)});
            if(c[k] == '#')r.push(j);
        }
    }
    priority_queue< pll, vector<pll>, greater<pll> >pr;
    pr.push({0, sa});
    d[sa] = 0;
    while(!pr.empty())
    {
        pll u = pr.top();
        pr.pop();
        if(d[u.se] != u.fi)continue;
        int j = (u.se % m == 0) ? m : u.se  % m, i = (u.se - j) / m + 1;
        //cout << i <<" "<<j<<" "<<u.fi<<'\n';
        for(pll v : adj[u.se])
        {
            if(d[v.se] > d[u.se] + v.fi)
            {

                d[v.se] = d[u.se] + v.fi;
                pr.push({d[v.se], v.se});
            }
        }
    }

    cout << d[fn];
}
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    sol();
}

Compilation message

portals.cpp: In function 'void sol()':
portals.cpp:71:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   71 |     for(int i = 1; i <= n; i ++)
      |     ^~~
portals.cpp:93:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   93 |         for(int i = 1; i <= n; i ++)
      |         ^~~
portals.cpp:187:50: warning: unused variable 'i' [-Wunused-variable]
  187 |         int j = (u.se % m == 0) ? m : u.se  % m, i = (u.se - j) / m + 1;
      |                                                  ^
portals.cpp:181:11: warning: 'sa' may be used uninitialized in this function [-Wmaybe-uninitialized]
  181 |     d[sa] = 0;
      |     ~~~~~~^~~
portals.cpp:200:17: warning: 'fn' may be used uninitialized in this function [-Wmaybe-uninitialized]
  200 |     cout << d[fn];
      |                 ^

Subtask #1
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 23808 KB Output is correct
2 Correct 16 ms 23808 KB Output is correct
3 Correct 16 ms 23808 KB Output is correct
4 Correct 16 ms 23808 KB Output is correct
5 Correct 18 ms 23808 KB Output is correct
6 Correct 16 ms 23808 KB Output is correct
7 Correct 17 ms 23808 KB Output is correct
8 Correct 17 ms 23936 KB Output is correct
9 Correct 17 ms 23808 KB Output is correct
10 Correct 18 ms 23808 KB Output is correct

Subtask #2
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 23808 KB Output is correct
2 Correct 18 ms 23808 KB Output is correct
3 Correct 19 ms 23808 KB Output is correct
4 Correct 17 ms 23808 KB Output is correct
5 Correct 16 ms 23808 KB Output is correct
6 Correct 18 ms 23808 KB Output is correct
7 Correct 16 ms 23808 KB Output is correct
8 Correct 19 ms 23808 KB Output is correct
9 Correct 20 ms 24064 KB Output is correct
10 Correct 18 ms 24064 KB Output is correct
11 Correct 18 ms 24064 KB Output is correct
12 Correct 18 ms 24064 KB Output is correct
13 Correct 20 ms 24064 KB Output is correct
14 Correct 17 ms 23808 KB Output is correct
15 Correct 17 ms 24064 KB Output is correct
16 Correct 17 ms 23808 KB Output is correct

Subtask #3
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 17 ms 23808 KB Output is correct
2 Correct 16 ms 23808 KB Output is correct
3 Correct 16 ms 23808 KB Output is correct
4 Correct 16 ms 23808 KB Output is correct
5 Correct 38 ms 27640 KB Output is correct
6 Correct 39 ms 27644 KB Output is correct
7 Correct 37 ms 27512 KB Output is correct
8 Correct 35 ms 27736 KB Output is correct

Subtask #4
19.0 / 19.0

# 결과 실행 시간 메모리 Grader output
1 Correct 17 ms 23808 KB Output is correct
2 Correct 16 ms 23808 KB Output is correct
3 Correct 17 ms 23808 KB Output is correct
4 Correct 21 ms 23936 KB Output is correct
5 Correct 19 ms 23808 KB Output is correct
6 Correct 16 ms 23808 KB Output is correct
7 Correct 17 ms 23808 KB Output is correct
8 Correct 16 ms 23808 KB Output is correct
9 Correct 17 ms 24064 KB Output is correct
10 Correct 17 ms 24064 KB Output is correct
11 Correct 18 ms 24192 KB Output is correct
12 Correct 17 ms 24064 KB Output is correct
13 Correct 18 ms 24064 KB Output is correct
14 Correct 51 ms 27640 KB Output is correct
15 Correct 46 ms 27768 KB Output is correct
16 Correct 40 ms 27520 KB Output is correct
17 Correct 38 ms 27512 KB Output is correct
18 Correct 41 ms 27700 KB Output is correct
19 Correct 44 ms 27384 KB Output is correct
20 Correct 47 ms 27392 KB Output is correct
21 Correct 40 ms 27640 KB Output is correct
22 Correct 39 ms 27648 KB Output is correct
23 Correct 38 ms 27648 KB Output is correct
24 Correct 36 ms 27392 KB Output is correct
25 Correct 18 ms 23808 KB Output is correct
26 Correct 17 ms 24064 KB Output is correct
27 Correct 17 ms 23808 KB Output is correct
28 Correct 35 ms 27640 KB Output is correct

Subtask #5
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 18 ms 23808 KB Output is correct
2 Correct 16 ms 23808 KB Output is correct
3 Correct 17 ms 23808 KB Output is correct
4 Correct 17 ms 23808 KB Output is correct
5 Correct 16 ms 23808 KB Output is correct
6 Correct 16 ms 23808 KB Output is correct
7 Correct 17 ms 23808 KB Output is correct
8 Correct 16 ms 23808 KB Output is correct
9 Correct 20 ms 24064 KB Output is correct
10 Correct 18 ms 24064 KB Output is correct
11 Correct 18 ms 24064 KB Output is correct
12 Correct 18 ms 24040 KB Output is correct
13 Correct 20 ms 24064 KB Output is correct
14 Correct 49 ms 27616 KB Output is correct
15 Correct 40 ms 27552 KB Output is correct
16 Correct 48 ms 27556 KB Output is correct
17 Correct 44 ms 27512 KB Output is correct
18 Correct 46 ms 27640 KB Output is correct
19 Correct 44 ms 27392 KB Output is correct
20 Correct 40 ms 27384 KB Output is correct
21 Correct 44 ms 27640 KB Output is correct
22 Correct 45 ms 27616 KB Output is correct
23 Correct 39 ms 27640 KB Output is correct
24 Correct 780 ms 116364 KB Output is correct
25 Correct 794 ms 111224 KB Output is correct
26 Correct 702 ms 111096 KB Output is correct
27 Correct 695 ms 111320 KB Output is correct
28 Correct 801 ms 118340 KB Output is correct
29 Correct 849 ms 118624 KB Output is correct
30 Correct 869 ms 118496 KB Output is correct
31 Correct 36 ms 27384 KB Output is correct
32 Correct 712 ms 112056 KB Output is correct
33 Correct 20 ms 23808 KB Output is correct
34 Correct 17 ms 24064 KB Output is correct
35 Correct 751 ms 117368 KB Output is correct
36 Correct 19 ms 23808 KB Output is correct
37 Correct 40 ms 27776 KB Output is correct
38 Correct 783 ms 119864 KB Output is correct
39 Correct 782 ms 116600 KB Output is correct