답안 #386528

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
386528	2021-04-06T18:25:42 Z	tushar_2658	Mecho (IOI09_mecho)	C++14	73 / 100	297 ms	8940 KB

mecho

#include "bits/stdc++.h"
using namespace std;

const int maxn = 805;

char s[maxn][maxn];
int n, S; 
int vis[maxn][maxn], dis[maxn][maxn], dis1[maxn][maxn];
int dx[] = {1, 0, -1, 0};
int dy[] = {0, 1, 0, -1};
int sx, sy, fx, fy;

void precalc(){
  queue<pair<int, int>> q;
  for(int i = 1; i <= n; ++i){
    for(int j = 1; j <= n; ++j){
      dis[i][j] = n * n;
      vis[i][j] = 0;
      if(s[i][j] == 'H'){
        vis[i][j] = 1;
        q.push({i, j});
        dis[i][j] = 0;
      }
    }
  }
  while(!q.empty()){
    pair<int, int> src = q.front();
    q.pop();   
    for(int i = 0; i < 4; ++i){
      int newx = src.first + dx[i], newy = src.second + dy[i];
      if(newx <= n && newx > 0 && newy <= n && newy > 0){
        if(vis[newx][newy] == 0 && s[newx][newy] != 'T'){
          vis[newx][newy] = 1;
          dis[newx][newy] = min(dis[newx][newy], dis[src.first][src.second] + 1);
          q.push({newx, newy});
        }
      }
    }
  }
}

bool can(int x){
  queue<pair<int, int>> q;
  for(int i = 1; i <= n; ++i){
    for(int j = 1; j <= n; ++j){
      dis1[i][j] = n * n;
      if(s[i][j] == 'D'){
        vis[i][j] = 0;
      }else if(s[i][j] == 'T')vis[i][j] = 1;
      else if(s[i][j] == 'H'){
        vis[i][j] = 1;
      }else if(s[i][j] == 'M'){
        vis[i][j] = 1;
        dis1[i][j] = 0;
        q.push({i, j});
      }else {
        vis[i][j] = 0;
      }
    }
  }
  while(!q.empty()){
    pair<int, int> src = q.front();
    q.pop();
    for(int i = 0; i < 4; ++i){
      int newx = src.first + dx[i], newy = src.second + dy[i];
      if(newx <= n && newx > 0 && newy <= n && newy > 0){
        if(s[newx][newy] != 'T' && !vis[newx][newy]){
          int cost = (dis1[src.first][src.second] + 1) / S + x; 
          if(cost < dis[newx][newy]){
            vis[newx][newy] = 1;
            dis1[newx][newy] = dis1[src.first][src.second] + 1;
            q.push({newx, newy});
          }
        }
      }
    }
  }
  if(vis[fx][fy])return 1;
  return 0;
}

int main(int argc, char const *argv[])
{
  ios::sync_with_stdio(false);
  cin.tie(0);

  cin >> n >> S;
  for(int i = 1; i <= n; ++i){
    for(int j = 1; j <= n; ++j){
      cin >> s[i][j];
      if(s[i][j] == 'M'){
        sx = i, sy = j;
      }else if(s[i][j] == 'D'){
        fx = i, fy = j;
      }
    }
  }
  precalc();
  int lo = 0, hi = n * n, ans = -1;
  while(lo <= hi){
    int mid = (lo + hi) >> 1;
    if(can(mid)){
      ans = mid;
      lo = mid + 1;
    }else {
      hi = mid - 1;
    }
  }
  cout << ans << '\n';

  return 0;
}

Subtask #1

73.0 / 100.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	364 KB	Output is correct
2	Incorrect	1 ms	364 KB	Output isn't correct
3	Correct	1 ms	364 KB	Output is correct
4	Incorrect	1 ms	364 KB	Output isn't correct
5	Correct	2 ms	492 KB	Output is correct
6	Incorrect	1 ms	492 KB	Output isn't correct
7	Incorrect	127 ms	8684 KB	Output isn't correct
8	Correct	1 ms	492 KB	Output is correct
9	Correct	1 ms	492 KB	Output is correct
10	Correct	1 ms	492 KB	Output is correct
11	Correct	1 ms	492 KB	Output is correct
12	Incorrect	1 ms	1004 KB	Output isn't correct
13	Incorrect	1 ms	876 KB	Output isn't correct
14	Correct	2 ms	1004 KB	Output is correct
15	Correct	1 ms	620 KB	Output is correct
16	Correct	1 ms	620 KB	Output is correct
17	Correct	1 ms	620 KB	Output is correct
18	Correct	1 ms	620 KB	Output is correct
19	Correct	1 ms	620 KB	Output is correct
20	Correct	1 ms	620 KB	Output is correct
21	Correct	1 ms	748 KB	Output is correct
22	Correct	1 ms	748 KB	Output is correct
23	Correct	1 ms	876 KB	Output is correct
24	Correct	2 ms	876 KB	Output is correct
25	Correct	1 ms	1004 KB	Output is correct
26	Correct	2 ms	1004 KB	Output is correct
27	Correct	2 ms	1004 KB	Output is correct
28	Correct	2 ms	1004 KB	Output is correct
29	Correct	2 ms	1132 KB	Output is correct
30	Correct	2 ms	1132 KB	Output is correct
31	Correct	2 ms	1132 KB	Output is correct
32	Correct	2 ms	1132 KB	Output is correct
33	Correct	10 ms	3948 KB	Output is correct
34	Correct	13 ms	4084 KB	Output is correct
35	Correct	31 ms	3948 KB	Output is correct
36	Correct	12 ms	4480 KB	Output is correct
37	Correct	13 ms	4460 KB	Output is correct
38	Correct	41 ms	4460 KB	Output is correct
39	Correct	15 ms	4972 KB	Output is correct
40	Correct	16 ms	4972 KB	Output is correct
41	Correct	54 ms	5100 KB	Output is correct
42	Correct	18 ms	5484 KB	Output is correct
43	Correct	27 ms	5484 KB	Output is correct
44	Correct	89 ms	5484 KB	Output is correct
45	Correct	22 ms	5996 KB	Output is correct
46	Correct	23 ms	5996 KB	Output is correct
47	Correct	76 ms	5996 KB	Output is correct
48	Correct	25 ms	6508 KB	Output is correct
49	Correct	27 ms	6508 KB	Output is correct
50	Correct	96 ms	6508 KB	Output is correct
51	Correct	30 ms	7020 KB	Output is correct
52	Correct	32 ms	7020 KB	Output is correct
53	Correct	115 ms	7020 KB	Output is correct
54	Correct	34 ms	7532 KB	Output is correct
55	Correct	36 ms	7532 KB	Output is correct
56	Correct	137 ms	7532 KB	Output is correct
57	Correct	38 ms	8044 KB	Output is correct
58	Correct	41 ms	8044 KB	Output is correct
59	Correct	155 ms	8172 KB	Output is correct
60	Correct	43 ms	8556 KB	Output is correct
61	Correct	46 ms	8556 KB	Output is correct
62	Correct	177 ms	8616 KB	Output is correct
63	Correct	184 ms	8684 KB	Output is correct
64	Correct	297 ms	8684 KB	Output is correct
65	Correct	242 ms	8684 KB	Output is correct
66	Correct	211 ms	8684 KB	Output is correct
67	Correct	198 ms	8684 KB	Output is correct
68	Correct	164 ms	8684 KB	Output is correct
69	Correct	136 ms	8556 KB	Output is correct
70	Correct	112 ms	8684 KB	Output is correct
71	Correct	121 ms	8556 KB	Output is correct
72	Incorrect	108 ms	8684 KB	Output isn't correct
73	Incorrect	75 ms	8812 KB	Output isn't correct
74	Correct	102 ms	8940 KB	Output is correct
75	Correct	113 ms	8812 KB	Output is correct
76	Correct	109 ms	8940 KB	Output is correct
77	Correct	114 ms	8812 KB	Output is correct
78	Correct	146 ms	8940 KB	Output is correct
79	Correct	84 ms	8812 KB	Output is correct
80	Correct	96 ms	8812 KB	Output is correct
81	Correct	107 ms	8812 KB	Output is correct
82	Correct	104 ms	8940 KB	Output is correct
83	Correct	115 ms	8812 KB	Output is correct
84	Correct	109 ms	8812 KB	Output is correct
85	Correct	115 ms	8824 KB	Output is correct
86	Correct	114 ms	8940 KB	Output is correct
87	Correct	116 ms	8832 KB	Output is correct
88	Correct	121 ms	8812 KB	Output is correct
89	Correct	120 ms	8812 KB	Output is correct
90	Correct	122 ms	8684 KB	Output is correct
91	Correct	127 ms	8684 KB	Output is correct
92	Correct	130 ms	8860 KB	Output is correct