oj.uz

Submission #369822

# Submission time Handle Problem Language Result Execution time Memory
369822 2021-02-22T13:55:03 Z ACmachine Portals (BOI14_portals) C++17
100 / 100
 247 ms 87556 KB 
#include <bits/stdc++.h>
using namespace std;

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;

template<typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T, typename U> using ordered_map = tree<T, U, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

typedef long long ll;
typedef long double ld;
typedef double db;
typedef string str;

typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<pii> vpii;
typedef vector<pll> vpll;
typedef vector<str> vstr;

#define FOR(i,j,k,in) for(int i=(j); i < (k);i+=in)
#define FORD(i,j,k,in) for(int i=(j); i >=(k);i-=in)
#define REP(i,b) FOR(i,0,b,1)
#define REPD(i,b) FORD(i,b,0,1)
#define pb push_back 
#define mp make_pair
#define ff first
#define ss second
#define all(x) begin(x), end(x)
#define rsz resize 
#define MANY_TESTS int tcase; cin >> tcase; while(tcase--)
	
const double EPS = 1e-9;
const int MOD = 1e9+7; // 998244353;
const ll INFF = 1e18;
const int INF = 1e9;
const ld PI = acos((ld)-1);
const vi dy = {1, 0, -1, 0, -1, 1, 1, -1};
const vi dx = {0, 1, 0, -1, -1, 1, -1, 1};

#ifdef DEBUG
#define DBG if(1)
#else
#define DBG if(0)
#endif

#define dbg(x) cout << "(" << #x << " : " << x << ")" << endl;
// ostreams
template <class T, class U>
ostream& operator<<(ostream& out, const pair<T, U> &par) {out << "[" << par.first << ";" << par.second << "]"; return out;}
template <class T>
ostream& operator<<(ostream& out, const set<T> &cont) { out << "{"; for( const auto &x:cont) out << x << ", "; out << "}"; return out; }
template <class T, class U>
ostream& operator<<(ostream& out, const map<T, U> &cont) {out << "{"; for( const auto &x:cont) out << x << ", "; out << "}"; return out; }
template<class T>
ostream& operator<<(ostream& out, const vector<T> &v){ out << "[";  REP(i, v.size()) out << v[i] << ", ";  out << "]"; return out;}
// istreams
template<class T>
istream& operator>>(istream& in, vector<T> &v){ for(auto &x : v) in >> x; return in; }
template<class T, class U>
istream& operator>>(istream& in, pair<T, U> &p){ in >> p.ff >> p.ss; return in; }
//searches
template<typename T, typename U>
T bsl(T lo, T hi, U f){ hi++; T mid; while(lo < hi){ mid = (lo + hi)/2; f(mid) ? hi = mid : lo = mid+1; } return lo; }
template<typename U>
double bsld(double lo, double hi, U f, double p = 1e-9){ int r = 3 + (int)log2((hi - lo)/p); double mid; while(r--){ mid = (lo + hi)/2; f(mid) ? hi = mid : lo = mid; } return (lo + hi)/2; }
template<typename T, typename U>
T bsh(T lo, T hi, U f){ lo--; T mid; while(lo < hi){ mid = (lo + hi + 1)/2; f(mid) ? lo = mid : hi = mid-1; } return lo; }
template<typename U>
double bshd(double lo, double hi, U f, double p = 1e-9){ int r = 3+(int)log2((hi - lo)/p); double mid; while(r--){ mid = (lo + hi)/2; f(mid) ? lo = mid : hi = mid; } return (lo + hi)/2; }
// some more utility functions
template<typename T>
pair<T, int> get_min(vector<T> &v){ typename vector<T> :: iterator it = min_element(v.begin(), v.end()); return mp(*it, it - v.begin());}
template<typename T>
pair<T, int> get_max(vector<T> &v){ typename vector<T> :: iterator it = max_element(v.begin(), v.end()); return mp(*it, it - v.begin());}        
template<typename T> bool ckmin(T& a, const T& b){return b < a ? a = b , true : false;}
template<typename T> bool ckmax(T& a, const T& b){return b > a ? a = b, true : false;}

    
int main(){
 	ios_base::sync_with_stdio(false);
 	cin.tie(NULL); cout.tie(NULL);
	int r, c;
    cin >> r >> c;
    vector<string> grid(r + 2, string(c + 2, '#'));
    FOR(i, 1, r + 1, 1){
        string s; cin >> s;
        grid[i][0] = grid[i][c + 1] = '#';
        FOR(j, 1, c + 1, 1) grid[i][j] = s[j - 1];
    }
    r += 2;
    c += 2;
    vector<vector<array<int, 4>>> nx(r, vector<array<int, 4>>(c, {-1, -1, -1, -1}));
    REP(i, c){
        int lst = 0;
        REP(j, r){
            if(grid[j][i] == '#')
                lst = j;
            nx[j][i][0] = lst;
        } 
        REPD(j, r - 1){
            if(grid[j][i] == '#')
                lst = j;
            nx[j][i][1] = lst;
        }
    }
    REP(i, r){
        int lst = 0;
        REP(j, c){
            if(grid[i][j] == '#')
                lst = j;
            nx[i][j][2] = lst;
        }
        REPD(j, c - 1){
            if(grid[i][j] == '#')
                lst = j;
            nx[i][j][3] = lst;
        }
    }
    vector<vector<bool>> special(r, vector<bool>(c, false));
    REP(i, r){
        REP(j, c){
            if(grid[i][j] == '#') continue;
            REP(sm, 4){
                int ny = i + dy[sm];
                int nx = j + dx[sm];
                if(grid[ny][nx] == '#')
                    special[i][j] = true;
            }
        }
    }
    vector<vector<int>> dist_to_special(r, vector<int>(c, -1));
    queue<array<int, 2>> q;
    REP(i, r){
        REP(j, c){
            if(special[i][j]){ 
                dist_to_special[i][j] = 0;
                q.push({i, j});
            }
        }
    }
    while(!q.empty()){
        auto v = q.front();
        q.pop();
        REP(sm, 4){
            int ny = v[0] + dy[sm];
            int nx = v[1] + dx[sm];
            if(grid[ny][nx] != '#' && dist_to_special[ny][nx] == -1){
                dist_to_special[ny][nx] = dist_to_special[v[0]][v[1]] + 1;
                q.push({ny, nx});
            }
        }
    }
    array<int, 2> src;
    array<int, 2> dest;
    vector<vector<int>> dist(r, vector<int>(c, -1));
    REP(i, r){
        REP(j, c){
            if(grid[i][j] == 'S')
                src = {i, j};
            if(grid[i][j] == 'C')
                dest = {i, j};
        }
    }
    const int mx = 1000000;
    vector<vector<array<int, 2>>> pq(mx);
    pq[0].pb(src);
    REP(i, mx){
        REP(k, pq[i].size()){
            auto v = pq[i][k];
            if(dist[v[0]][v[1]] != -1) continue;
            dist[v[0]][v[1]] = i;
            int row = v[0];
            int col = v[1];
            REP(j, 4){
                int nr, nc;
                if(j < 2){
                    nr = nx[row][col][j] + (j == 0 ? 1 : -1);
                    nc = col;
                }
                else{
                    nr = row;
                    nc = nx[row][col][j] + (j == 2 ? 1 : -1);
                }
                if(dist[nr][nc] == -1){
                    if(dist[row][col] + dist_to_special[row][col] + 1 >= mx) continue; 
                    pq[dist[row][col] + dist_to_special[row][col] + 1].pb({nr, nc}); 
                }
            }
            REP(sm, 4){
                int nr = row + dy[sm];
                int nc = col + dx[sm];
                if(dist[nr][nc] == -1 && grid[nr][nc] != '#'){
                    if(dist[row][col] + 1 >= mx) continue;
                    pq[dist[row][col] + 1].pb({nr, nc});
                } 
            }
        }
    } 
    cout << dist[dest[0]][dest[1]] << "\n";
    return 0;
}

Compilation message

portals.cpp: In function 'int main()':
portals.cpp:26:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::array<int, 2> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 | #define FOR(i,j,k,in) for(int i=(j); i < (k);i+=in)
      |                                        ^
portals.cpp:28:18: note: in expansion of macro 'FOR'
   28 | #define REP(i,b) FOR(i,0,b,1)
      |                  ^~~
portals.cpp:174:9: note: in expansion of macro 'REP'
  174 |         REP(k, pq[i].size()){
      |         ^~~
portals.cpp:205:25: warning: 'dest.std::array<int, 2>::_M_elems[0]' may be used uninitialized in this function [-Wmaybe-uninitialized]
  205 |     cout << dist[dest[0]][dest[1]] << "\n";
      |                         ^
portals.cpp:205:34: warning: 'dest.std::array<int, 2>::_M_elems[1]' may be used uninitialized in this function [-Wmaybe-uninitialized]
  205 |     cout << dist[dest[0]][dest[1]] << "\n";
      |                                  ^

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 23788 KB Output is correct
2 Correct 19 ms 23788 KB Output is correct
3 Correct 17 ms 23788 KB Output is correct
4 Correct 18 ms 23788 KB Output is correct
5 Correct 18 ms 23788 KB Output is correct
6 Correct 20 ms 23788 KB Output is correct
7 Correct 18 ms 23788 KB Output is correct
8 Correct 18 ms 23788 KB Output is correct
9 Correct 19 ms 23788 KB Output is correct
10 Correct 21 ms 23936 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 23788 KB Output is correct
2 Correct 19 ms 23788 KB Output is correct
3 Correct 18 ms 23788 KB Output is correct
4 Correct 19 ms 23788 KB Output is correct
5 Correct 19 ms 23788 KB Output is correct
6 Correct 18 ms 23788 KB Output is correct
7 Correct 18 ms 23788 KB Output is correct
8 Correct 20 ms 23788 KB Output is correct
9 Correct 22 ms 23916 KB Output is correct
10 Correct 18 ms 24044 KB Output is correct
11 Correct 18 ms 23912 KB Output is correct
12 Correct 19 ms 23916 KB Output is correct
13 Correct 19 ms 23916 KB Output is correct
14 Correct 19 ms 23788 KB Output is correct
15 Correct 22 ms 23916 KB Output is correct
16 Correct 22 ms 23788 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 19 ms 23856 KB Output is correct
2 Correct 18 ms 23808 KB Output is correct
3 Correct 18 ms 23820 KB Output is correct
4 Correct 18 ms 23788 KB Output is correct
5 Correct 27 ms 25324 KB Output is correct
6 Correct 25 ms 25324 KB Output is correct
7 Correct 25 ms 25452 KB Output is correct
8 Correct 24 ms 25708 KB Output is correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 23788 KB Output is correct
2 Correct 19 ms 23788 KB Output is correct
3 Correct 22 ms 23864 KB Output is correct
4 Correct 18 ms 23788 KB Output is correct
5 Correct 20 ms 23788 KB Output is correct
6 Correct 19 ms 23788 KB Output is correct
7 Correct 20 ms 23916 KB Output is correct
8 Correct 18 ms 23788 KB Output is correct
9 Correct 19 ms 24044 KB Output is correct
10 Correct 18 ms 24044 KB Output is correct
11 Correct 19 ms 24044 KB Output is correct
12 Correct 23 ms 23916 KB Output is correct
13 Correct 20 ms 23916 KB Output is correct
14 Correct 31 ms 25324 KB Output is correct
15 Correct 25 ms 25452 KB Output is correct
16 Correct 25 ms 25452 KB Output is correct
17 Correct 25 ms 25580 KB Output is correct
18 Correct 26 ms 25708 KB Output is correct
19 Correct 24 ms 25836 KB Output is correct
20 Correct 25 ms 26732 KB Output is correct
21 Correct 25 ms 25452 KB Output is correct
22 Correct 28 ms 25324 KB Output is correct
23 Correct 31 ms 25580 KB Output is correct
24 Correct 26 ms 25964 KB Output is correct
25 Correct 20 ms 23808 KB Output is correct
26 Correct 20 ms 23916 KB Output is correct
27 Correct 20 ms 23788 KB Output is correct
28 Correct 26 ms 25708 KB Output is correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 19 ms 23788 KB Output is correct
2 Correct 21 ms 23788 KB Output is correct
3 Correct 19 ms 23788 KB Output is correct
4 Correct 19 ms 23936 KB Output is correct
5 Correct 19 ms 23788 KB Output is correct
6 Correct 19 ms 23788 KB Output is correct
7 Correct 20 ms 23788 KB Output is correct
8 Correct 21 ms 23916 KB Output is correct
9 Correct 20 ms 23916 KB Output is correct
10 Correct 20 ms 24044 KB Output is correct
11 Correct 20 ms 23916 KB Output is correct
12 Correct 20 ms 23916 KB Output is correct
13 Correct 20 ms 23916 KB Output is correct
14 Correct 27 ms 25324 KB Output is correct
15 Correct 26 ms 25452 KB Output is correct
16 Correct 26 ms 25452 KB Output is correct
17 Correct 26 ms 25580 KB Output is correct
18 Correct 32 ms 25708 KB Output is correct
19 Correct 25 ms 25836 KB Output is correct
20 Correct 27 ms 26732 KB Output is correct
21 Correct 26 ms 25452 KB Output is correct
22 Correct 26 ms 25324 KB Output is correct
23 Correct 26 ms 25452 KB Output is correct
24 Correct 194 ms 64204 KB Output is correct
25 Correct 246 ms 66308 KB Output is correct
26 Correct 232 ms 79112 KB Output is correct
27 Correct 247 ms 87556 KB Output is correct
28 Correct 191 ms 61232 KB Output is correct
29 Correct 195 ms 61036 KB Output is correct
30 Correct 203 ms 60784 KB Output is correct
31 Correct 25 ms 25836 KB Output is correct
32 Correct 201 ms 68076 KB Output is correct
33 Correct 19 ms 23788 KB Output is correct
34 Correct 19 ms 23916 KB Output is correct
35 Correct 158 ms 61176 KB Output is correct
36 Correct 18 ms 23788 KB Output is correct
37 Correct 26 ms 25708 KB Output is correct
38 Correct 206 ms 70764 KB Output is correct
39 Correct 111 ms 54508 KB Output is correct