| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 74491 |
2018-09-02T13:10:44 Z |
JustInCase |
Mecho (IOI09_mecho) |
C++17 |
|
306 ms |
11704 KB |
#include <bits/stdc++.h>
#define endl '\n'
using namespace std;
const int64_t MAX_N = 800;
const int64_t DELTA_ROWS[] = { -1, 0, 1, 0 };
const int64_t DELTA_COLS[] = { 0, 1, 0, -1 };
char board[MAX_N + 5][MAX_N + 5];
int64_t n, s, startR, startC, endR, endC, beeTimes[MAX_N + 5][MAX_N + 5];
int64_t mechoTimes[MAX_N + 5][MAX_N + 5];
vector< pair< int64_t, int64_t > > hives;
void PrecomputeBeeTimes() {
queue< pair< int64_t, int64_t > > q;
memset(beeTimes, -1, sizeof(beeTimes));
for(auto &x : hives) {
q.push(x);
beeTimes[x.first][x.second] = 0;
}
while(!q.empty()) {
int64_t r = q.front().first, c = q.front().second;
int64_t time = beeTimes[r][c];
q.pop();
for(int64_t p = 0; p < 4; p++) {
int64_t newR = r + DELTA_ROWS[p];
int64_t newC = c + DELTA_COLS[p];
if(newR >= 0 && newR < n && newC >= 0 && newC < n
&& board[newR][newC] == 'G' && beeTimes[newR][newC] == -1) {
q.push({ newR, newC });
beeTimes[newR][newC] = time + 1;
}
}
}
}
bool Check(int64_t startTime) {
queue< pair< int64_t, int64_t > > q;
memset(mechoTimes, -1, sizeof(mechoTimes));
mechoTimes[startR][startC] = startTime;
if(startTime >= beeTimes[startR][startC]) {
return false;
}
q.push({ startR, startC });
while(!q.empty()) {
int64_t r = q.front().first, c = q.front().second;
int64_t nxtTime = mechoTimes[r][c] + 1;
q.pop();
if(r == endR && c == endC) {
return true;
}
int64_t maxBeeTime;
if(nxtTime % s == 0) {
maxBeeTime = nxtTime + 1;
}
else {
maxBeeTime = nxtTime;
}
for(int64_t p = 0; p < 4; p++) {
int64_t newR = r + DELTA_ROWS[p];
int64_t newC = c + DELTA_COLS[p];
if(newR >= 0 && newR < n && newC >= 0 && newC < n
&& (board[newR][newC] == 'G' || board[newR][newC] == 'D')
&& mechoTimes[newR][newC] == -1
&& (beeTimes[newR][newC] >= maxBeeTime
|| beeTimes[newR][newC] < 0)) {
q.push({ newR, newC });
mechoTimes[newR][newC] = nxtTime;
}
}
}
return false;
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cin >> n >> s;
for(int64_t i = 0; i < n; i++) {
for(int64_t j = 0; j < n; j++) {
cin >> board[i][j];
if(board[i][j] == 'M') {
startR = i;
startC = j;
board[i][j] = 'G';
}
else if(board[i][j] == 'D') {
endR = i;
endC = j;
}
else if(board[i][j] == 'H') {
hives.push_back({ i, j });
}
}
}
PrecomputeBeeTimes();
for(int64_t i = 0; i < n; i++) {
for(int64_t j = 0; j < n; j++) {
beeTimes[i][j] *= s;
}
}
int64_t low = 0, high = MAX_N * MAX_N * MAX_N, ans = -1;
while(low <= high) {
int64_t mid = (low + high) / 2;
if(Check(mid * s)) {
low = mid + 1;
ans = mid;
}
else {
high = mid - 1;
}
}
cout << ans << endl;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
18 ms |
10488 KB |
Output is correct |
| 2 |
Correct |
17 ms |
10672 KB |
Output is correct |
| 3 |
Correct |
18 ms |
10672 KB |
Output is correct |
| 4 |
Correct |
17 ms |
10672 KB |
Output is correct |
| 5 |
Correct |
19 ms |
10672 KB |
Output is correct |
| 6 |
Correct |
29 ms |
10672 KB |
Output is correct |
| 7 |
Correct |
176 ms |
11704 KB |
Output is correct |
| 8 |
Correct |
17 ms |
11704 KB |
Output is correct |
| 9 |
Correct |
18 ms |
11704 KB |
Output is correct |
| 10 |
Correct |
17 ms |
11704 KB |
Output is correct |
| 11 |
Correct |
17 ms |
11704 KB |
Output is correct |
| 12 |
Correct |
17 ms |
11704 KB |
Output is correct |
| 13 |
Correct |
18 ms |
11704 KB |
Output is correct |
| 14 |
Correct |
19 ms |
11704 KB |
Output is correct |
| 15 |
Correct |
19 ms |
11704 KB |
Output is correct |
| 16 |
Correct |
17 ms |
11704 KB |
Output is correct |
| 17 |
Correct |
18 ms |
11704 KB |
Output is correct |
| 18 |
Correct |
18 ms |
11704 KB |
Output is correct |
| 19 |
Correct |
17 ms |
11704 KB |
Output is correct |
| 20 |
Correct |
17 ms |
11704 KB |
Output is correct |
| 21 |
Correct |
37 ms |
11704 KB |
Output is correct |
| 22 |
Correct |
18 ms |
11704 KB |
Output is correct |
| 23 |
Correct |
19 ms |
11704 KB |
Output is correct |
| 24 |
Correct |
20 ms |
11704 KB |
Output is correct |
| 25 |
Correct |
17 ms |
11704 KB |
Output is correct |
| 26 |
Correct |
17 ms |
11704 KB |
Output is correct |
| 27 |
Correct |
17 ms |
11704 KB |
Output is correct |
| 28 |
Correct |
18 ms |
11704 KB |
Output is correct |
| 29 |
Correct |
18 ms |
11704 KB |
Output is correct |
| 30 |
Correct |
18 ms |
11704 KB |
Output is correct |
| 31 |
Correct |
18 ms |
11704 KB |
Output is correct |
| 32 |
Correct |
18 ms |
11704 KB |
Output is correct |
| 33 |
Correct |
30 ms |
11704 KB |
Output is correct |
| 34 |
Correct |
23 ms |
11704 KB |
Output is correct |
| 35 |
Correct |
54 ms |
11704 KB |
Output is correct |
| 36 |
Correct |
22 ms |
11704 KB |
Output is correct |
| 37 |
Correct |
22 ms |
11704 KB |
Output is correct |
| 38 |
Correct |
60 ms |
11704 KB |
Output is correct |
| 39 |
Correct |
23 ms |
11704 KB |
Output is correct |
| 40 |
Correct |
23 ms |
11704 KB |
Output is correct |
| 41 |
Correct |
80 ms |
11704 KB |
Output is correct |
| 42 |
Correct |
25 ms |
11704 KB |
Output is correct |
| 43 |
Correct |
26 ms |
11704 KB |
Output is correct |
| 44 |
Correct |
99 ms |
11704 KB |
Output is correct |
| 45 |
Correct |
27 ms |
11704 KB |
Output is correct |
| 46 |
Correct |
26 ms |
11704 KB |
Output is correct |
| 47 |
Correct |
131 ms |
11704 KB |
Output is correct |
| 48 |
Correct |
28 ms |
11704 KB |
Output is correct |
| 49 |
Correct |
30 ms |
11704 KB |
Output is correct |
| 50 |
Correct |
160 ms |
11704 KB |
Output is correct |
| 51 |
Correct |
28 ms |
11704 KB |
Output is correct |
| 52 |
Correct |
30 ms |
11704 KB |
Output is correct |
| 53 |
Correct |
185 ms |
11704 KB |
Output is correct |
| 54 |
Correct |
37 ms |
11704 KB |
Output is correct |
| 55 |
Correct |
32 ms |
11704 KB |
Output is correct |
| 56 |
Correct |
183 ms |
11704 KB |
Output is correct |
| 57 |
Correct |
31 ms |
11704 KB |
Output is correct |
| 58 |
Correct |
32 ms |
11704 KB |
Output is correct |
| 59 |
Correct |
209 ms |
11704 KB |
Output is correct |
| 60 |
Correct |
35 ms |
11704 KB |
Output is correct |
| 61 |
Correct |
33 ms |
11704 KB |
Output is correct |
| 62 |
Correct |
251 ms |
11704 KB |
Output is correct |
| 63 |
Correct |
198 ms |
11704 KB |
Output is correct |
| 64 |
Correct |
306 ms |
11704 KB |
Output is correct |
| 65 |
Correct |
298 ms |
11704 KB |
Output is correct |
| 66 |
Correct |
241 ms |
11704 KB |
Output is correct |
| 67 |
Correct |
202 ms |
11704 KB |
Output is correct |
| 68 |
Correct |
80 ms |
11704 KB |
Output is correct |
| 69 |
Correct |
83 ms |
11704 KB |
Output is correct |
| 70 |
Correct |
77 ms |
11704 KB |
Output is correct |
| 71 |
Correct |
60 ms |
11704 KB |
Output is correct |
| 72 |
Correct |
58 ms |
11704 KB |
Output is correct |
| 73 |
Correct |
82 ms |
11704 KB |
Output is correct |
| 74 |
Correct |
107 ms |
11704 KB |
Output is correct |
| 75 |
Correct |
121 ms |
11704 KB |
Output is correct |
| 76 |
Correct |
140 ms |
11704 KB |
Output is correct |
| 77 |
Correct |
124 ms |
11704 KB |
Output is correct |
| 78 |
Correct |
143 ms |
11704 KB |
Output is correct |
| 79 |
Correct |
164 ms |
11704 KB |
Output is correct |
| 80 |
Correct |
121 ms |
11704 KB |
Output is correct |
| 81 |
Correct |
147 ms |
11704 KB |
Output is correct |
| 82 |
Correct |
112 ms |
11704 KB |
Output is correct |
| 83 |
Correct |
199 ms |
11704 KB |
Output is correct |
| 84 |
Correct |
182 ms |
11704 KB |
Output is correct |
| 85 |
Correct |
120 ms |
11704 KB |
Output is correct |
| 86 |
Correct |
141 ms |
11704 KB |
Output is correct |
| 87 |
Correct |
166 ms |
11704 KB |
Output is correct |
| 88 |
Correct |
154 ms |
11704 KB |
Output is correct |
| 89 |
Correct |
188 ms |
11704 KB |
Output is correct |
| 90 |
Correct |
151 ms |
11704 KB |
Output is correct |
| 91 |
Correct |
140 ms |
11704 KB |
Output is correct |
| 92 |
Correct |
238 ms |
11704 KB |
Output is correct |
