## Submission #148013

# Submission time Handle Problem Language Result Execution time Memory
148013 2019-08-31T11:12:00 Z arnold518 None (KOI17_civilization) C++14
54 / 100
1000 ms 52220 KB
```#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 2000;
const int MAXK = 1e5;

const int dy[]={-1, 1, 0, 0};
const int dx[]={0, 0, -1, 1};

int N, K, A[MAXN+10][MAXN+10];

int conv(int y, int x) { return (y-1)*N+(x-1); }

int par[MAXN*MAXN+10], Rank[MAXN*MAXN+10], cnt=0, ans;
int Find(int x) { return x==par[x]?x:par[x]=Find(par[x]); }
void Union(int x, int y)
{
x=Find(x); y=Find(y);
if(Rank[x]<Rank[y]) swap(x, y);
if(Rank[x]==Rank[y]) Rank[x]++;
par[y]=x;
}

void dfs(int y, int x)
{
int i, j;
A[y][x]=1;
for(i=0; i<4; i++)
{
int ny=y+dy[i], nx=x+dx[i];
if(!(1<=ny && ny<=N && 1<=nx && nx<=N)) continue;
if(A[ny][nx]!=-1) continue;
dfs(ny, nx);
Union(conv(y, x), conv(ny, nx));
}
}

struct Queue { int y, x; };
queue<Queue> Q;

int main()
{
int i, j, k;

scanf("%d%d", &N, &K);
for(i=0; i<N*N; i++) par[i]=i, Rank[i]=1;
for(i=1; i<=K; i++)
{
int y, x;
scanf("%d%d", &y, &x);
A[y][x]=-1;
Q.push({y, x});
}

for(i=1; i<=N; i++) for(j=1; j<=N; j++)
{
if(A[i][j]!=-1) continue;
dfs(i, j);
cnt++;
}

//for(i=1; i<=N; i++) { for(j=1; j<=N; j++) printf("%d ", A[i][j]); printf("\n"); }
//printf("\n");

if(cnt==1) return !printf("0");

while(!Q.empty())
{
int sz=Q.size(); ans++;
while(sz--)
{
Queue T=Q.front(); Q.pop();
for(i=0; i<4; i++)
{
int ny=T.y+dy[i], nx=T.x+dx[i];
if(!(1<=ny && ny<=N && 1<=nx && nx<=N)) continue;
if(Find(conv(ny, nx))==Find(conv(T.y, T.x))) continue;
if(A[ny][nx]==0)
{
Union(conv(ny, nx), conv(T.y, T.x));
A[ny][nx]=1;
Q.push({ny, nx});
}
else
{
cnt--;
Union(conv(ny, nx), conv(T.y, T.x));
}
}
}

sz=Q.size();
while(sz--)
{
Queue T=Q.front(); Q.pop(); Q.push(T);
for(i=0; i<4; i++)
{
int ny=T.y+dy[i], nx=T.x+dx[i];
if(!(1<=ny && ny<=N && 1<=nx && nx<=N)) continue;
if(Find(conv(ny, nx))==Find(conv(T.y, T.x))) continue;
if(A[ny][nx]!=0)
{
cnt--;
Union(conv(ny, nx), conv(T.y, T.x));
}
}
}
//for(i=1; i<=N; i++) { for(j=1; j<=N; j++) printf("%d ", A[i][j]); printf("\n"); }
//printf("-> %d\n", cnt);
if(cnt==1) return !printf("%d", ans);
}
}
```

### Compilation message

```civilization.cpp: In function 'void dfs(int, int)':
civilization.cpp:30:12: warning: unused variable 'j' [-Wunused-variable]
int i, j;
^
civilization.cpp: In function 'int main()':
civilization.cpp:47:15: warning: unused variable 'k' [-Wunused-variable]
int i, j, k;
^
civilization.cpp:49:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d", &N, &K);
~~~~~^~~~~~~~~~~~~~~~
civilization.cpp:54:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d", &y, &x);
~~~~~^~~~~~~~~~~~~~~~```

#### Subtask #1 19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 888 KB Output is correct
2 Correct 3 ms 760 KB Output is correct
3 Correct 3 ms 888 KB Output is correct
4 Correct 3 ms 888 KB Output is correct
5 Correct 3 ms 888 KB Output is correct
6 Correct 3 ms 888 KB Output is correct
7 Correct 3 ms 888 KB Output is correct
8 Correct 3 ms 888 KB Output is correct
9 Correct 3 ms 888 KB Output is correct
10 Correct 2 ms 368 KB Output is correct
11 Correct 3 ms 888 KB Output is correct
12 Correct 3 ms 888 KB Output is correct

#### Subtask #2 35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 888 KB Output is correct
2 Correct 3 ms 760 KB Output is correct
3 Correct 3 ms 888 KB Output is correct
4 Correct 3 ms 888 KB Output is correct
5 Correct 3 ms 888 KB Output is correct
6 Correct 3 ms 888 KB Output is correct
7 Correct 3 ms 888 KB Output is correct
8 Correct 3 ms 888 KB Output is correct
9 Correct 3 ms 888 KB Output is correct
10 Correct 2 ms 368 KB Output is correct
11 Correct 3 ms 888 KB Output is correct
12 Correct 133 ms 15896 KB Output is correct
13 Correct 106 ms 15096 KB Output is correct
14 Correct 138 ms 15580 KB Output is correct
15 Correct 96 ms 14452 KB Output is correct
16 Correct 24 ms 10104 KB Output is correct
17 Correct 378 ms 19396 KB Output is correct
18 Correct 304 ms 19320 KB Output is correct
19 Correct 336 ms 19320 KB Output is correct
20 Correct 319 ms 19328 KB Output is correct
21 Correct 281 ms 19408 KB Output is correct
22 Correct 13 ms 8312 KB Output is correct
23 Correct 99 ms 16132 KB Output is correct
24 Correct 3 ms 888 KB Output is correct

#### Subtask #3 0 / 46.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 888 KB Output is correct
2 Correct 3 ms 760 KB Output is correct
3 Correct 3 ms 888 KB Output is correct
4 Correct 3 ms 888 KB Output is correct
5 Correct 3 ms 888 KB Output is correct
6 Correct 3 ms 888 KB Output is correct
7 Correct 3 ms 888 KB Output is correct
8 Correct 3 ms 888 KB Output is correct
9 Correct 3 ms 888 KB Output is correct
10 Correct 2 ms 368 KB Output is correct
11 Correct 3 ms 888 KB Output is correct
12 Correct 133 ms 15896 KB Output is correct
13 Correct 106 ms 15096 KB Output is correct
14 Correct 138 ms 15580 KB Output is correct
15 Correct 96 ms 14452 KB Output is correct
16 Correct 24 ms 10104 KB Output is correct
17 Correct 378 ms 19396 KB Output is correct
18 Correct 304 ms 19320 KB Output is correct
19 Correct 336 ms 19320 KB Output is correct
20 Correct 319 ms 19328 KB Output is correct
21 Correct 281 ms 19408 KB Output is correct
22 Correct 13 ms 8312 KB Output is correct
23 Correct 99 ms 16132 KB Output is correct
24 Correct 389 ms 47136 KB Output is correct
25 Correct 484 ms 47356 KB Output is correct
26 Correct 340 ms 42872 KB Output is correct
27 Correct 388 ms 47212 KB Output is correct
28 Correct 258 ms 41848 KB Output is correct
29 Execution timed out 1060 ms 52220 KB Time limit exceeded
30 Halted 0 ms 0 KB -