| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 53583 |
2018-06-30T09:04:00 Z |
ho94949 |
Mecho (IOI09_mecho) |
C++17 |
|
310 ms |
6744 KB |
#include<bits/stdc++.h>
using namespace std;
const int INF = 0x3f3f3f3f;
int N, S;
char arr[1024][1024];
int dist[1024][1024];
bool vis[1024][1024];
bool valid(int x, int y)
{
return 0<=x&&x<N&&0<=y&&y<N;
}
bool can(int t)
{
queue<tuple<int, int, int> > Q;
memset(vis, false, sizeof(vis));
for(int i=0; i<N; ++i)
for(int j=0; j<N; ++j)
if(arr[i][j] == 'M')
{
if(dist[i][j] <= t*S) return false;
Q.emplace(t*S, i, j);
}
while(!Q.empty())
{
int di, x, y; tie(di, x, y) = Q.front(); Q.pop();
if(arr[x][y] == 'D') return true;
for(int d=0; d<4; ++d)
{
int nx = x+"1210"[d]-'1';
int ny = y+"0121"[d]-'1';
if(!valid(nx, ny)) continue;
if(arr[nx][ny] != 'G' && arr[nx][ny] != 'D') continue;
if(dist[nx][ny] <= di+1) continue;
if(vis[nx][ny]) continue;
Q.emplace(di+1, nx, ny);
vis[nx][ny] = true;
}
}
return false;
}
void init()
{
memset(dist, 0x3f, sizeof dist);
queue<pair<int, int> > Q;
for(int i=0; i<N; ++i)
for(int j=0; j<N; ++j)
{
if(arr[i][j] == 'H')
{
Q.emplace(i, j);
dist[i][j] = 0;
}
}
while(!Q.empty())
{
int x, y; tie(x, y) = Q.front(); Q.pop();
for(int d=0;d<4;++d)
{
int nx = x+"1210"[d] - '1';
int ny = y+"0121"[d] - '1';
if(!valid(nx, ny)) continue;
if(arr[nx][ny] != 'G' && arr[nx][ny] != 'M') continue;
if(dist[nx][ny] != INF) continue;
dist[nx][ny] = dist[x][y]+S;
Q.emplace(nx, ny);
}
}
}
int main()
{
scanf("%d%d", &N, &S);
for(int i=0; i<N; ++i)
scanf("%s", arr[i]);
int lo = -1; //pos
int hi = N*N; //impos
init();
while(lo+1!=hi)
{
int mi = (lo+hi)/2;
if(can(mi)) lo = mi;
else hi = mi;
}
printf("%d\n", lo);
}
Compilation message
mecho.cpp: In function 'int main()':
mecho.cpp:71:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d", &N, &S);
~~~~~^~~~~~~~~~~~~~~~
mecho.cpp:73:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%s", arr[i]);
~~~~~^~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
5368 KB |
Output is correct |
| 2 |
Correct |
6 ms |
5476 KB |
Output is correct |
| 3 |
Correct |
6 ms |
5528 KB |
Output is correct |
| 4 |
Correct |
7 ms |
5528 KB |
Output is correct |
| 5 |
Correct |
6 ms |
5584 KB |
Output is correct |
| 6 |
Correct |
6 ms |
5588 KB |
Output is correct |
| 7 |
Correct |
146 ms |
6484 KB |
Output is correct |
| 8 |
Correct |
7 ms |
6484 KB |
Output is correct |
| 9 |
Correct |
6 ms |
6484 KB |
Output is correct |
| 10 |
Correct |
7 ms |
6484 KB |
Output is correct |
| 11 |
Correct |
7 ms |
6484 KB |
Output is correct |
| 12 |
Correct |
7 ms |
6484 KB |
Output is correct |
| 13 |
Correct |
7 ms |
6484 KB |
Output is correct |
| 14 |
Correct |
7 ms |
6484 KB |
Output is correct |
| 15 |
Correct |
7 ms |
6484 KB |
Output is correct |
| 16 |
Correct |
6 ms |
6484 KB |
Output is correct |
| 17 |
Correct |
6 ms |
6484 KB |
Output is correct |
| 18 |
Correct |
6 ms |
6484 KB |
Output is correct |
| 19 |
Correct |
6 ms |
6484 KB |
Output is correct |
| 20 |
Correct |
6 ms |
6484 KB |
Output is correct |
| 21 |
Correct |
6 ms |
6484 KB |
Output is correct |
| 22 |
Correct |
6 ms |
6484 KB |
Output is correct |
| 23 |
Correct |
6 ms |
6484 KB |
Output is correct |
| 24 |
Correct |
7 ms |
6484 KB |
Output is correct |
| 25 |
Correct |
6 ms |
6484 KB |
Output is correct |
| 26 |
Correct |
7 ms |
6484 KB |
Output is correct |
| 27 |
Correct |
7 ms |
6484 KB |
Output is correct |
| 28 |
Correct |
7 ms |
6484 KB |
Output is correct |
| 29 |
Correct |
8 ms |
6484 KB |
Output is correct |
| 30 |
Correct |
6 ms |
6484 KB |
Output is correct |
| 31 |
Correct |
7 ms |
6484 KB |
Output is correct |
| 32 |
Correct |
7 ms |
6484 KB |
Output is correct |
| 33 |
Correct |
13 ms |
6484 KB |
Output is correct |
| 34 |
Correct |
15 ms |
6484 KB |
Output is correct |
| 35 |
Correct |
35 ms |
6484 KB |
Output is correct |
| 36 |
Correct |
15 ms |
6484 KB |
Output is correct |
| 37 |
Correct |
18 ms |
6484 KB |
Output is correct |
| 38 |
Correct |
69 ms |
6484 KB |
Output is correct |
| 39 |
Correct |
20 ms |
6484 KB |
Output is correct |
| 40 |
Correct |
21 ms |
6484 KB |
Output is correct |
| 41 |
Correct |
57 ms |
6484 KB |
Output is correct |
| 42 |
Correct |
27 ms |
6484 KB |
Output is correct |
| 43 |
Correct |
28 ms |
6484 KB |
Output is correct |
| 44 |
Correct |
97 ms |
6484 KB |
Output is correct |
| 45 |
Correct |
26 ms |
6484 KB |
Output is correct |
| 46 |
Correct |
28 ms |
6484 KB |
Output is correct |
| 47 |
Correct |
81 ms |
6484 KB |
Output is correct |
| 48 |
Correct |
28 ms |
6484 KB |
Output is correct |
| 49 |
Correct |
35 ms |
6484 KB |
Output is correct |
| 50 |
Correct |
94 ms |
6484 KB |
Output is correct |
| 51 |
Correct |
30 ms |
6484 KB |
Output is correct |
| 52 |
Correct |
36 ms |
6484 KB |
Output is correct |
| 53 |
Correct |
114 ms |
6484 KB |
Output is correct |
| 54 |
Correct |
37 ms |
6484 KB |
Output is correct |
| 55 |
Correct |
47 ms |
6484 KB |
Output is correct |
| 56 |
Correct |
209 ms |
6524 KB |
Output is correct |
| 57 |
Correct |
51 ms |
6524 KB |
Output is correct |
| 58 |
Correct |
61 ms |
6524 KB |
Output is correct |
| 59 |
Correct |
228 ms |
6524 KB |
Output is correct |
| 60 |
Correct |
44 ms |
6524 KB |
Output is correct |
| 61 |
Correct |
58 ms |
6524 KB |
Output is correct |
| 62 |
Correct |
194 ms |
6564 KB |
Output is correct |
| 63 |
Correct |
174 ms |
6564 KB |
Output is correct |
| 64 |
Correct |
310 ms |
6652 KB |
Output is correct |
| 65 |
Correct |
237 ms |
6652 KB |
Output is correct |
| 66 |
Correct |
198 ms |
6652 KB |
Output is correct |
| 67 |
Correct |
191 ms |
6652 KB |
Output is correct |
| 68 |
Correct |
107 ms |
6652 KB |
Output is correct |
| 69 |
Correct |
91 ms |
6652 KB |
Output is correct |
| 70 |
Correct |
84 ms |
6652 KB |
Output is correct |
| 71 |
Correct |
83 ms |
6652 KB |
Output is correct |
| 72 |
Correct |
76 ms |
6652 KB |
Output is correct |
| 73 |
Correct |
47 ms |
6652 KB |
Output is correct |
| 74 |
Correct |
122 ms |
6688 KB |
Output is correct |
| 75 |
Correct |
143 ms |
6688 KB |
Output is correct |
| 76 |
Correct |
138 ms |
6688 KB |
Output is correct |
| 77 |
Correct |
98 ms |
6688 KB |
Output is correct |
| 78 |
Correct |
134 ms |
6688 KB |
Output is correct |
| 79 |
Correct |
97 ms |
6688 KB |
Output is correct |
| 80 |
Correct |
106 ms |
6688 KB |
Output is correct |
| 81 |
Correct |
123 ms |
6688 KB |
Output is correct |
| 82 |
Correct |
107 ms |
6688 KB |
Output is correct |
| 83 |
Correct |
122 ms |
6692 KB |
Output is correct |
| 84 |
Correct |
103 ms |
6692 KB |
Output is correct |
| 85 |
Correct |
123 ms |
6692 KB |
Output is correct |
| 86 |
Correct |
114 ms |
6692 KB |
Output is correct |
| 87 |
Correct |
146 ms |
6692 KB |
Output is correct |
| 88 |
Correct |
165 ms |
6692 KB |
Output is correct |
| 89 |
Correct |
123 ms |
6692 KB |
Output is correct |
| 90 |
Correct |
123 ms |
6692 KB |
Output is correct |
| 91 |
Correct |
122 ms |
6692 KB |
Output is correct |
| 92 |
Correct |
133 ms |
6744 KB |
Output is correct |
