| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 484157 |
2021-11-02T08:33:39 Z |
nehasane |
Mecho (IOI09_mecho) |
C++14 |
|
674 ms |
10180 KB |
#include <bits/stdc++.h>
using namespace std;
const int MAX_N = 800;
vector <string> field(MAX_N);
bool bees_visited[MAX_N][MAX_N], mecho_visited[MAX_N][MAX_N];
int mecho_dis[MAX_N][MAX_N], bees_dis[MAX_N][MAX_N], eating_dis[MAX_N][MAX_N];
queue <pair <int, int>> mecho_q, bees_q;
int dx[] = {-1, 1, 0, 0};
int dy[] = {0, 0, -1, 1};
int n, s;
bool valid_sq(int x, int y, bool is_mecho){
if (x >= 0 && x < n && y >= 0 && y < n){
if (is_mecho && (field[x][y] == 'G' || field[x][y] == 'D' || field[x][y] == 'M'))
return true;
else if (!is_mecho && (field[x][y] == 'G' || field[x][y] == 'M'))
return true;
return false;
}
return false;
}
int main()
{
// freopen("in.txt", "r", stdin);
// freopen("out.txt", "w", stdout);
cin >> n >> s;
for (int i = 0; i < n; i++)
cin >> field[i];
vector <pair <int, int>> hives;
int startx, starty, home_x, home_y;
//find Mecho's position
for (int i = 0; i < n; i++){
for (int j = 0; j < n; j++){
if (field[i][j] == 'M'){
startx = i;
starty = j;
}else if (field[i][j] == 'H'){
hives.push_back({i, j});
}else if (field[i][j] == 'D'){
home_x = i;
home_y = j;
}
}
}
int l = 0, r = n*n;
while (l <= r){
int eating_time = (l + r) / 2;
memset(bees_visited, false, sizeof(bees_visited));
memset(mecho_visited, false, sizeof(mecho_visited));
memset(bees_dis, 0, sizeof(bees_dis));
memset(mecho_dis, 0, sizeof(mecho_dis));
//move bees
for (auto i : hives){
bees_q.push({i.first, i.second});
bees_visited[i.first][i.second] = true;
}
while (!bees_q.empty()){
int x = bees_q.front().first, y = bees_q.front().second;
bees_q.pop();
for (int i = 0; i < 4; i++){
int nx = x + dx[i], ny = y + dy[i];
if (valid_sq(nx, ny, false) && !bees_visited[nx][ny]){
if (eating_dis[x][y] < eating_time){
eating_dis[nx][ny] = eating_dis[x][y] + 1;
}else{
bees_dis[nx][ny] = bees_dis[x][y] + 1;
eating_dis[nx][ny] = INT_MAX;
}
bees_q.push({nx, ny});
bees_visited[nx][ny] = true;
}
}
}
mecho_q.push({startx, starty});
mecho_visited[startx][starty] = true;
if (bees_dis[startx][starty] <= eating_time)
mecho_q.pop();
while (!mecho_q.empty()){
int x = mecho_q.front().first, y = mecho_q.front().second;
mecho_q.pop();
for (int i = 0; i < 4; i++){
int nx = x + dx[i], ny = y + dy[i];
if (valid_sq(nx, ny, true) && !mecho_visited[nx][ny] && (mecho_dis[x][y] + 1) / s < bees_dis[nx][ny]){
mecho_visited[nx][ny] = true;
mecho_q.push({nx, ny});
mecho_dis[nx][ny] = mecho_dis[x][y] + 1;
}
}
}
bool mecho_reached = false;
for (int i = 0; i < 4; i++){
int nx = home_x+ dx[i], ny = home_y + dy[i];
if (valid_sq(nx, ny, true)){
if (bees_dis[nx][ny] > (mecho_dis[nx][ny] / s) && mecho_visited[nx][ny]){
mecho_reached = true;
break;
}
}
}
if (mecho_reached)
l = eating_time + 1;
else
r = eating_time - 1;
}
cout << l - 1 << '\n';
}
Compilation message
mecho.cpp: In function 'int main()':
mecho.cpp:75:36: warning: 'starty' may be used uninitialized in this function [-Wmaybe-uninitialized]
75 | if (bees_dis[startx][starty] <= eating_time)
| ~~~~~~~~~~~~~~~~~~~~~~~^
mecho.cpp:75:36: warning: 'startx' may be used uninitialized in this function [-Wmaybe-uninitialized]
mecho.cpp:91:37: warning: 'home_y' may be used uninitialized in this function [-Wmaybe-uninitialized]
91 | int nx = home_x+ dx[i], ny = home_y + dy[i];
| ^~
mecho.cpp:91:17: warning: 'home_x' may be used uninitialized in this function [-Wmaybe-uninitialized]
91 | int nx = home_x+ dx[i], ny = home_y + dy[i];
| ^~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
6476 KB |
Output is correct |
| 2 |
Correct |
4 ms |
6604 KB |
Output is correct |
| 3 |
Incorrect |
4 ms |
6604 KB |
Output isn't correct |
| 4 |
Correct |
3 ms |
6604 KB |
Output is correct |
| 5 |
Correct |
4 ms |
6604 KB |
Output is correct |
| 6 |
Correct |
4 ms |
6612 KB |
Output is correct |
| 7 |
Correct |
561 ms |
9944 KB |
Output is correct |
| 8 |
Correct |
4 ms |
6604 KB |
Output is correct |
| 9 |
Incorrect |
4 ms |
6604 KB |
Output isn't correct |
| 10 |
Correct |
5 ms |
6604 KB |
Output is correct |
| 11 |
Incorrect |
4 ms |
6604 KB |
Output isn't correct |
| 12 |
Correct |
9 ms |
6732 KB |
Output is correct |
| 13 |
Correct |
7 ms |
6732 KB |
Output is correct |
| 14 |
Correct |
8 ms |
6732 KB |
Output is correct |
| 15 |
Incorrect |
5 ms |
6604 KB |
Output isn't correct |
| 16 |
Incorrect |
5 ms |
6604 KB |
Output isn't correct |
| 17 |
Incorrect |
5 ms |
6604 KB |
Output isn't correct |
| 18 |
Incorrect |
7 ms |
6604 KB |
Output isn't correct |
| 19 |
Incorrect |
5 ms |
6604 KB |
Output isn't correct |
| 20 |
Incorrect |
5 ms |
6680 KB |
Output isn't correct |
| 21 |
Incorrect |
6 ms |
6604 KB |
Output isn't correct |
| 22 |
Incorrect |
5 ms |
6604 KB |
Output isn't correct |
| 23 |
Incorrect |
6 ms |
6656 KB |
Output isn't correct |
| 24 |
Incorrect |
5 ms |
6732 KB |
Output isn't correct |
| 25 |
Incorrect |
5 ms |
6776 KB |
Output isn't correct |
| 26 |
Incorrect |
7 ms |
6732 KB |
Output isn't correct |
| 27 |
Incorrect |
7 ms |
6800 KB |
Output isn't correct |
| 28 |
Incorrect |
7 ms |
6796 KB |
Output isn't correct |
| 29 |
Incorrect |
9 ms |
6732 KB |
Output isn't correct |
| 30 |
Incorrect |
8 ms |
6860 KB |
Output isn't correct |
| 31 |
Incorrect |
7 ms |
6828 KB |
Output isn't correct |
| 32 |
Incorrect |
8 ms |
6724 KB |
Output isn't correct |
| 33 |
Incorrect |
46 ms |
7960 KB |
Output isn't correct |
| 34 |
Incorrect |
68 ms |
7756 KB |
Output isn't correct |
| 35 |
Correct |
73 ms |
7756 KB |
Output is correct |
| 36 |
Incorrect |
57 ms |
8012 KB |
Output isn't correct |
| 37 |
Incorrect |
87 ms |
8016 KB |
Output isn't correct |
| 38 |
Correct |
98 ms |
8020 KB |
Output is correct |
| 39 |
Incorrect |
72 ms |
8204 KB |
Output isn't correct |
| 40 |
Incorrect |
68 ms |
8192 KB |
Output isn't correct |
| 41 |
Correct |
131 ms |
8196 KB |
Output is correct |
| 42 |
Incorrect |
123 ms |
8608 KB |
Output isn't correct |
| 43 |
Incorrect |
100 ms |
8524 KB |
Output isn't correct |
| 44 |
Correct |
183 ms |
8608 KB |
Output is correct |
| 45 |
Incorrect |
116 ms |
8760 KB |
Output isn't correct |
| 46 |
Incorrect |
134 ms |
8712 KB |
Output isn't correct |
| 47 |
Correct |
185 ms |
8732 KB |
Output is correct |
| 48 |
Incorrect |
146 ms |
9036 KB |
Output isn't correct |
| 49 |
Incorrect |
132 ms |
9004 KB |
Output isn't correct |
| 50 |
Correct |
213 ms |
8984 KB |
Output is correct |
| 51 |
Incorrect |
148 ms |
9164 KB |
Output isn't correct |
| 52 |
Incorrect |
157 ms |
9232 KB |
Output isn't correct |
| 53 |
Correct |
327 ms |
9232 KB |
Output is correct |
| 54 |
Incorrect |
168 ms |
9420 KB |
Output isn't correct |
| 55 |
Incorrect |
179 ms |
9548 KB |
Output isn't correct |
| 56 |
Correct |
320 ms |
9436 KB |
Output is correct |
| 57 |
Incorrect |
210 ms |
9632 KB |
Output isn't correct |
| 58 |
Incorrect |
238 ms |
9624 KB |
Output isn't correct |
| 59 |
Correct |
369 ms |
9644 KB |
Output is correct |
| 60 |
Incorrect |
246 ms |
9840 KB |
Output isn't correct |
| 61 |
Incorrect |
256 ms |
9836 KB |
Output isn't correct |
| 62 |
Correct |
433 ms |
9840 KB |
Output is correct |
| 63 |
Correct |
509 ms |
9752 KB |
Output is correct |
| 64 |
Correct |
674 ms |
9844 KB |
Output is correct |
| 65 |
Correct |
586 ms |
9796 KB |
Output is correct |
| 66 |
Correct |
546 ms |
9932 KB |
Output is correct |
| 67 |
Correct |
523 ms |
9840 KB |
Output is correct |
| 68 |
Correct |
488 ms |
9804 KB |
Output is correct |
| 69 |
Correct |
536 ms |
9864 KB |
Output is correct |
| 70 |
Correct |
508 ms |
9864 KB |
Output is correct |
| 71 |
Correct |
504 ms |
9868 KB |
Output is correct |
| 72 |
Incorrect |
470 ms |
9924 KB |
Output isn't correct |
| 73 |
Incorrect |
454 ms |
10132 KB |
Output isn't correct |
| 74 |
Correct |
482 ms |
10136 KB |
Output is correct |
| 75 |
Correct |
545 ms |
10144 KB |
Output is correct |
| 76 |
Correct |
483 ms |
10136 KB |
Output is correct |
| 77 |
Correct |
572 ms |
10136 KB |
Output is correct |
| 78 |
Correct |
517 ms |
10100 KB |
Output is correct |
| 79 |
Correct |
492 ms |
10100 KB |
Output is correct |
| 80 |
Correct |
504 ms |
10052 KB |
Output is correct |
| 81 |
Correct |
507 ms |
9984 KB |
Output is correct |
| 82 |
Correct |
489 ms |
10180 KB |
Output is correct |
| 83 |
Correct |
534 ms |
10052 KB |
Output is correct |
| 84 |
Correct |
493 ms |
10176 KB |
Output is correct |
| 85 |
Correct |
546 ms |
10056 KB |
Output is correct |
| 86 |
Correct |
501 ms |
10060 KB |
Output is correct |
| 87 |
Correct |
523 ms |
10068 KB |
Output is correct |
| 88 |
Correct |
536 ms |
10004 KB |
Output is correct |
| 89 |
Correct |
498 ms |
9976 KB |
Output is correct |
| 90 |
Correct |
524 ms |
10004 KB |
Output is correct |
| 91 |
Correct |
509 ms |
10004 KB |
Output is correct |
| 92 |
Correct |
540 ms |
10004 KB |
Output is correct |
