답안 #6921 :: oj.uz

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
6921	2014-07-10T13:46:48 Z	tncks0121	포탈들 (BOI14_portals)	C++	100 / 100	368 ms	31372 KB

portals

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <memory.h>
#include <math.h>
#include <assert.h>
#include <stack>
#include <queue>
#include <map>
#include <set>
#include <algorithm>
#include <string>
#include <functional>
#include <vector>
#include <deque>
#include <utility>
#include <bitset>
#include <limits.h>

using namespace std;
typedef long long ll;
typedef unsigned long long llu;
typedef double lf;
typedef unsigned int uint;
typedef long double llf;
typedef pair<int, int> pii;
typedef pair<ll, int> pli;

const int SZ = 1005;

const int dx[] = {-1, 1, 0, 0}, dy[] = {0, 0, -1, 1};

int R, C;
char D[SZ][SZ];

queue<int> que;
void ins (int x, int y) {
    que.push(x);
    que.push(y);
}

int dist_wall[SZ][SZ];
int where_portal[4][SZ][SZ];

struct state {
    int x, y, d;
    state (int x = 0, int y = 0, int d = 0): x(x), y(y), d(d) { }
    bool operator < (const state &s) const { return d < s.d; }
    bool operator > (const state &s) const { return d > s.d; }
};

priority_queue<state, vector<state>, greater<state> > PQ;
int dst[SZ][SZ];

int main() {
    scanf("%d%d", &R, &C);
    for(int i = 1; i <= R; i++) scanf("%s", D[i]+1);
    
    // step 1: 각 격자에서 벽까지의 거리 구하기
    for(int i = 1; i <= R; i++) ins(i, 0), ins(i, C+1), D[i][0] = D[i][C+1] = '#';
    for(int j = 1; j <= C; j++) ins(0, j), ins(R+1, j), D[0][j] = D[R+1][j] = '#';
    for(int i = 1; i <= R; i++) for(int j = 1; j <= C; j++) {
        dst[i][j] = (int)1e6;
        if(D[i][j] == '#') que.push(i), que.push(j);
        if(D[i][j] == 'S') PQ.push( state(i, j, 0) ), dst[i][j] = 0;
    }
    
    while(!que.empty()) {
        int x = que.front(); que.pop();
        int y = que.front(); que.pop();
        for(int d = 0; d < 4; d++) {
            int xx = x+dx[d], yy = y+dy[d];
            if(D[xx][yy] == '#') continue;
            if(xx < 1 || yy < 1 || xx > R || yy > C || dist_wall[xx][yy] > 0) continue;
            dist_wall[xx][yy] = dist_wall[x][y] + 1;
            que.push(xx); que.push(yy);
        }
    }
    
    // step 2: 각 격자에서 위, 아래, 오른쪽, 왼쪽으로 포탈 쏘았을 때 닿는 벽 구하기
    for(int i = 1; i <= R; i++) {
        for(int j = 1; j <= C; j++) {
            where_portal[0][i][j] = (D[i-1][j] == '#') ? i : where_portal[0][i-1][j];
            where_portal[2][i][j] = (D[i][j-1] == '#') ? j : where_portal[2][i][j-1];
        }
    }
    for(int i = R; i > 0; i--) {
        for(int j = C; j > 0; j--) {
            where_portal[1][i][j] = (D[i+1][j] == '#') ? i : where_portal[1][i+1][j];
            where_portal[3][i][j] = (D[i][j+1] == '#') ? j : where_portal[3][i][j+1];
        }
    }
    
    // step 3: dijkstra
    while(!PQ.empty()) {
        state s = PQ.top(); PQ.pop();
        if(s.d > dst[s.x][s.y]) continue;
        if(D[s.x][s.y] == 'C') {
            printf("%d\n", s.d);
            return 0;
        }
        for(int d = 0; d < 4; d++) {
            state nxt = state(s.x + dx[d], s.y + dy[d], s.d + 1);
            if(D[nxt.x][nxt.y] == '#') continue;
            if(nxt.x < 1 || nxt.y < 1 || nxt.x > R || nxt.y > C) continue;
            if(dst[nxt.x][nxt.y] > nxt.d) {
                dst[nxt.x][nxt.y] = nxt.d;
                PQ.push (nxt);
            }
        }
        for(int d = 0; d < 4; d++) {
            state nxt = (d < 2) ?
                state(where_portal[d][s.x][s.y], s.y, s.d + dist_wall[s.x][s.y])
                : state(s.x, where_portal[d][s.x][s.y], s.d + dist_wall[s.x][s.y]);
            if(D[nxt.x][nxt.y] == '#') continue;
            if(nxt.x < 1 || nxt.y < 1 || nxt.x > R || nxt.y > C) continue;
            if(dst[nxt.x][nxt.y] > nxt.d) {
                dst[nxt.x][nxt.y] = nxt.d;
                PQ.push (nxt);
            }
        }
    }
    
    return 0;
}

Subtask #1
11.0 / 11.0

#	결과	메모리	Grader output
1	Correct	25900 KB	Output is correct
2	Correct	25900 KB	Output is correct
3	Correct	25900 KB	Output is correct
4	Correct	25900 KB	Output is correct
5	Correct	25900 KB	Output is correct
6	Correct	25900 KB	Output is correct
7	Correct	25900 KB	Output is correct
8	Correct	25900 KB	Output is correct
9	Correct	25900 KB	Output is correct
10	Correct	25900 KB	Output is correct

Subtask #2
20.0 / 20.0

#	결과	메모리	Grader output
1	Correct	25900 KB	Output is correct
2	Correct	25900 KB	Output is correct
3	Correct	25900 KB	Output is correct
4	Correct	25900 KB	Output is correct
5	Correct	25900 KB	Output is correct
6	Correct	25900 KB	Output is correct
7	Correct	25900 KB	Output is correct
8	Correct	25900 KB	Output is correct
9	Correct	25900 KB	Output is correct
10	Correct	25900 KB	Output is correct
11	Correct	25900 KB	Output is correct
12	Correct	25900 KB	Output is correct
13	Correct	25900 KB	Output is correct
14	Correct	25900 KB	Output is correct
15	Correct	25900 KB	Output is correct
16	Correct	25900 KB	Output is correct

Subtask #3
20.0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	25900 KB	Output is correct
2	Correct	0 ms	25900 KB	Output is correct
3	Correct	0 ms	25900 KB	Output is correct
4	Correct	0 ms	25900 KB	Output is correct
5	Correct	0 ms	26032 KB	Output is correct
6	Correct	8 ms	26032 KB	Output is correct
7	Correct	8 ms	26032 KB	Output is correct
8	Correct	0 ms	26032 KB	Output is correct

Subtask #4
19.0 / 19.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	25900 KB	Output is correct
2	Correct	0 ms	25900 KB	Output is correct
3	Correct	0 ms	25900 KB	Output is correct
4	Correct	0 ms	25900 KB	Output is correct
5	Correct	0 ms	25900 KB	Output is correct
6	Correct	0 ms	25900 KB	Output is correct
7	Correct	0 ms	25900 KB	Output is correct
8	Correct	0 ms	25900 KB	Output is correct
9	Correct	0 ms	25900 KB	Output is correct
10	Correct	0 ms	25900 KB	Output is correct
11	Correct	0 ms	25900 KB	Output is correct
12	Correct	0 ms	25900 KB	Output is correct
13	Correct	0 ms	25900 KB	Output is correct
14	Correct	0 ms	26032 KB	Output is correct
15	Correct	4 ms	26032 KB	Output is correct
16	Correct	0 ms	26032 KB	Output is correct
17	Correct	8 ms	26028 KB	Output is correct
18	Correct	0 ms	26028 KB	Output is correct
19	Correct	4 ms	25900 KB	Output is correct
20	Correct	4 ms	25900 KB	Output is correct
21	Correct	4 ms	26032 KB	Output is correct
22	Correct	0 ms	26032 KB	Output is correct
23	Correct	8 ms	26032 KB	Output is correct
24	Correct	8 ms	25900 KB	Output is correct
25	Correct	0 ms	25900 KB	Output is correct
26	Correct	0 ms	25900 KB	Output is correct
27	Correct	0 ms	25900 KB	Output is correct
28	Correct	4 ms	26032 KB	Output is correct

Subtask #5
30.0 / 30.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	25900 KB	Output is correct
2	Correct	0 ms	25900 KB	Output is correct
3	Correct	0 ms	25900 KB	Output is correct
4	Correct	0 ms	25900 KB	Output is correct
5	Correct	0 ms	25900 KB	Output is correct
6	Correct	0 ms	25900 KB	Output is correct
7	Correct	0 ms	25900 KB	Output is correct
8	Correct	0 ms	25900 KB	Output is correct
9	Correct	0 ms	25900 KB	Output is correct
10	Correct	0 ms	25900 KB	Output is correct
11	Correct	0 ms	25900 KB	Output is correct
12	Correct	0 ms	25900 KB	Output is correct
13	Correct	0 ms	25900 KB	Output is correct
14	Correct	4 ms	26032 KB	Output is correct
15	Correct	4 ms	26032 KB	Output is correct
16	Correct	4 ms	26032 KB	Output is correct
17	Correct	8 ms	26028 KB	Output is correct
18	Correct	8 ms	26028 KB	Output is correct
19	Correct	0 ms	25900 KB	Output is correct
20	Correct	0 ms	25900 KB	Output is correct
21	Correct	4 ms	26032 KB	Output is correct
22	Correct	4 ms	26032 KB	Output is correct
23	Correct	0 ms	26032 KB	Output is correct
24	Correct	204 ms	29920 KB	Output is correct
25	Correct	368 ms	26232 KB	Output is correct
26	Correct	72 ms	25900 KB	Output is correct
27	Correct	208 ms	26112 KB	Output is correct
28	Correct	164 ms	30580 KB	Output is correct
29	Correct	184 ms	30712 KB	Output is correct
30	Correct	188 ms	30712 KB	Output is correct
31	Correct	12 ms	25900 KB	Output is correct
32	Correct	332 ms	25900 KB	Output is correct
33	Correct	0 ms	25900 KB	Output is correct
34	Correct	0 ms	25900 KB	Output is correct
35	Correct	188 ms	27908 KB	Output is correct
36	Correct	0 ms	25900 KB	Output is correct
37	Correct	0 ms	26032 KB	Output is correct
38	Correct	120 ms	31372 KB	Output is correct
39	Correct	120 ms	30056 KB	Output is correct

답안 #6921

Compilation message

Subtask #1 11.0 / 11.0

Subtask #2 20.0 / 20.0

Subtask #3 20.0 / 20.0

Subtask #4 19.0 / 19.0

Subtask #5 30.0 / 30.0

Subtask #1
11.0 / 11.0

Subtask #2
20.0 / 20.0

Subtask #3
20.0 / 20.0

Subtask #4
19.0 / 19.0

Subtask #5
30.0 / 30.0