## Submission #140684

# Submission time Handle Problem Language Result Execution time Memory
140684 2019-08-04T12:43:49 Z khrbuddy03 None (KOI17_civilization) C++14
54 / 100
1000 ms 54084 KB
```#include <bits/stdc++.h>

using namespace std;

const int inf = 2e3 + 9;
const int dx[4] = {-1, 1, 0, 0};
const int dy[4] = {0, 0, -1, 1};

struct ds {
int par[inf * inf], siz[inf * inf];
inline int find(int u) {
if (u == par[u]) return u;
return par[u] = find(par[u]);
}
inline void merge(int u, int v) {
u = find(u); v = find(v);
if (u == v) return;
par[u] = v;
siz[v] += siz[u];
siz[u] = 0;
}
} cul;

int n, m;
int vis[inf][inf];

int main() {
scanf("%d%d", &n, &m);
for (int i = 0; i < n * n; ++i) cul.par[i] = i;
memset(vis, -1, sizeof(vis));
queue<pair<int, pair<int, int>>> q;
for (int i = 0; i < m; i++) {
int x, y; scanf("%d%d", &x, &y);
cul.siz[--y * n + --x] = 1;
q.push(make_pair(0, make_pair(y, x)));
vis[y][x] = y * n + x;
}
while (!q.empty()) {
int dist = q.front().first;
int y = q.front().second.first, x = q.front().second.second;
int here = y * n + x;
q.pop();
cul.merge(here, vis[y][x]);
for (int i = 0; i < 4; ++i) {
int ny = y + dy[i], nx = x + dx[i];
if (ny < 0 || ny >= n || nx < 0 || nx >= n) continue;
int there = ny * n + nx;
if (cul.siz[cul.find(there)] && cul.siz[cul.find(here)]) cul.merge(there, here);
if (vis[ny][nx] == -1) {
q.push(make_pair(dist + 1, make_pair(ny, nx)));
vis[ny][nx] = here;
}
}
if (cul.siz[cul.find(here)] == m) {
printf("%d\n", dist);
break;
}
}
}

```

### Compilation message

```civilization.cpp: In function 'int main()':
civilization.cpp:28:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d", &n, &m);
~~~~~^~~~~~~~~~~~~~~~
civilization.cpp:33:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
int x, y; scanf("%d%d", &x, &y);
~~~~~^~~~~~~~~~~~~~~~```

#### Subtask #1 19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 16248 KB Output is correct
2 Correct 15 ms 16248 KB Output is correct
3 Correct 16 ms 16248 KB Output is correct
4 Correct 16 ms 16248 KB Output is correct
5 Correct 16 ms 16248 KB Output is correct
6 Correct 16 ms 16248 KB Output is correct
7 Correct 16 ms 16248 KB Output is correct
8 Correct 16 ms 16248 KB Output is correct
9 Correct 16 ms 16248 KB Output is correct
10 Correct 15 ms 16248 KB Output is correct
11 Correct 16 ms 16168 KB Output is correct
12 Correct 19 ms 16276 KB Output is correct

#### Subtask #2 35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 16248 KB Output is correct
2 Correct 15 ms 16248 KB Output is correct
3 Correct 16 ms 16248 KB Output is correct
4 Correct 16 ms 16248 KB Output is correct
5 Correct 16 ms 16248 KB Output is correct
6 Correct 16 ms 16248 KB Output is correct
7 Correct 16 ms 16248 KB Output is correct
8 Correct 16 ms 16248 KB Output is correct
9 Correct 16 ms 16248 KB Output is correct
10 Correct 15 ms 16248 KB Output is correct
11 Correct 16 ms 16168 KB Output is correct
12 Correct 121 ms 24088 KB Output is correct
13 Correct 87 ms 24056 KB Output is correct
14 Correct 124 ms 24016 KB Output is correct
15 Correct 90 ms 24016 KB Output is correct
16 Correct 30 ms 22520 KB Output is correct
17 Correct 262 ms 28136 KB Output is correct
18 Correct 292 ms 28152 KB Output is correct
19 Correct 303 ms 28216 KB Output is correct
20 Correct 312 ms 28152 KB Output is correct
21 Correct 284 ms 28124 KB Output is correct
22 Correct 22 ms 23932 KB Output is correct
23 Correct 133 ms 24056 KB Output is correct
24 Correct 19 ms 16276 KB Output is correct

#### Subtask #3 0 / 46.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 16248 KB Output is correct
2 Correct 15 ms 16248 KB Output is correct
3 Correct 16 ms 16248 KB Output is correct
4 Correct 16 ms 16248 KB Output is correct
5 Correct 16 ms 16248 KB Output is correct
6 Correct 16 ms 16248 KB Output is correct
7 Correct 16 ms 16248 KB Output is correct
8 Correct 16 ms 16248 KB Output is correct
9 Correct 16 ms 16248 KB Output is correct
10 Correct 15 ms 16248 KB Output is correct
11 Correct 16 ms 16168 KB Output is correct
12 Correct 121 ms 24088 KB Output is correct
13 Correct 87 ms 24056 KB Output is correct
14 Correct 124 ms 24016 KB Output is correct
15 Correct 90 ms 24016 KB Output is correct
16 Correct 30 ms 22520 KB Output is correct
17 Correct 262 ms 28136 KB Output is correct
18 Correct 292 ms 28152 KB Output is correct
19 Correct 303 ms 28216 KB Output is correct
20 Correct 312 ms 28152 KB Output is correct
21 Correct 284 ms 28124 KB Output is correct
22 Correct 22 ms 23932 KB Output is correct
23 Correct 133 ms 24056 KB Output is correct
24 Correct 323 ms 45432 KB Output is correct
25 Correct 407 ms 47468 KB Output is correct
26 Correct 281 ms 46584 KB Output is correct
27 Correct 312 ms 45576 KB Output is correct
28 Correct 227 ms 45272 KB Output is correct
29 Execution timed out 1031 ms 54084 KB Time limit exceeded
30 Halted 0 ms 0 KB -