oj.uz

Submission #66392

# Submission time Handle Problem Language Result Execution time Memory
66392 2018-08-10T11:16:10 Z ansol4328 None (KOI17_civilization) C++
54 / 100
 1000 ms 44660 KB 
#include<stdio.h>
#include<memory.h>
#include<queue>

using namespace std;

int n, k;
int visit[2002][2002];

struct uf
{
    int p[4000002];
    int cnt;
    bool st[4000002];
    void setup(int a)
    {
        cnt=a;
        memset(p,-1,sizeof(p));
        memset(st,false,sizeof(st));
    }
    int f(int v)
    {
        if(p[v]==-1) return v;
        p[v]=f(p[v]);
        return p[v];
    }
    void u(int v1, int v2) // v2 subtree -> v1 subtree
    {
        v1=f(v1);
        v2=f(v2);
        if(v1==v2) return;
        if(st[v2]) cnt--;
        p[v2]=v1;
    }
};

uf T;
queue<int> Q;

int main()
{
    scanf("%d %d",&n,&k);
    T.setup(k);
    for(int i=0 ; i<k ; i++)
    {
        int x, y;
        scanf("%d %d",&y,&x);
        T.st[(y-1)*n+x-1]=true;
        Q.push((y-1)*n+x-1);
        visit[y][x]=1;
    }
    int res=1;
    int dy[4]={-1,0,1,0};
    int dx[4]={0,1,0,-1};
    while(T.cnt!=1)
    {
        int y=Q.front()/n+1;
        int x=Q.front()%n+1;
        Q.pop();
        res=max(res,visit[y][x]);
        for(int i=0 ; i<4 ; i++)
        {
            if(!(y+dy[i]>=1 && y+dy[i]<=n && x+dx[i]>=1 && x+dx[i]<=n)) continue;
            if(visit[y+dy[i]][x+dx[i]]==0)
            {
                visit[y+dy[i]][x+dx[i]]=visit[y][x]+1;
                T.u((y-1)*n+x-1,(y+dy[i]-1)*n+x+dx[i]-1);
                Q.push((y+dy[i]-1)*n+x+dx[i]-1);
            }
            else if(visit[y+dy[i]][x+dx[i]]<visit[y][x]+1)
            {
                T.u((y-1)*n+x-1,(y+dy[i]-1)*n+x+dx[i]-1);
                res=max(res,visit[y][x]);
            }
            if(T.cnt==1) break;
        }
    }
    printf("%d",res-1);
    return 0;
}

Compilation message

civilization.cpp: In function 'int main()':
civilization.cpp:42:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&n,&k);
     ~~~~~^~~~~~~~~~~~~~~
civilization.cpp:47:14: 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 19 ms 20344 KB Output is correct
2 Correct 18 ms 20344 KB Output is correct
3 Correct 19 ms 20368 KB Output is correct
4 Correct 20 ms 20388 KB Output is correct
5 Correct 18 ms 20608 KB Output is correct
6 Correct 19 ms 20608 KB Output is correct
7 Correct 19 ms 20608 KB Output is correct
8 Correct 20 ms 20608 KB Output is correct
9 Correct 20 ms 20608 KB Output is correct
10 Correct 19 ms 20608 KB Output is correct
11 Correct 19 ms 20608 KB Output is correct
12 Correct 19 ms 20620 KB Output is correct

Subtask #2
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 19 ms 20344 KB Output is correct
2 Correct 18 ms 20344 KB Output is correct
3 Correct 19 ms 20368 KB Output is correct
4 Correct 20 ms 20388 KB Output is correct
5 Correct 18 ms 20608 KB Output is correct
6 Correct 19 ms 20608 KB Output is correct
7 Correct 19 ms 20608 KB Output is correct
8 Correct 20 ms 20608 KB Output is correct
9 Correct 20 ms 20608 KB Output is correct
10 Correct 19 ms 20608 KB Output is correct
11 Correct 19 ms 20608 KB Output is correct
12 Correct 97 ms 27920 KB Output is correct
13 Correct 79 ms 27920 KB Output is correct
14 Correct 87 ms 27920 KB Output is correct
15 Correct 70 ms 27920 KB Output is correct
16 Correct 26 ms 27920 KB Output is correct
17 Correct 301 ms 30448 KB Output is correct
18 Correct 327 ms 31124 KB Output is correct
19 Correct 309 ms 32112 KB Output is correct
20 Correct 268 ms 32636 KB Output is correct
21 Correct 329 ms 33532 KB Output is correct
22 Correct 17 ms 33532 KB Output is correct
23 Correct 72 ms 33532 KB Output is correct
24 Correct 19 ms 20620 KB Output is correct

Subtask #3
0 / 46.0

# Verdict Execution time Memory Grader output
1 Correct 19 ms 20344 KB Output is correct
2 Correct 18 ms 20344 KB Output is correct
3 Correct 19 ms 20368 KB Output is correct
4 Correct 20 ms 20388 KB Output is correct
5 Correct 18 ms 20608 KB Output is correct
6 Correct 19 ms 20608 KB Output is correct
7 Correct 19 ms 20608 KB Output is correct
8 Correct 20 ms 20608 KB Output is correct
9 Correct 20 ms 20608 KB Output is correct
10 Correct 19 ms 20608 KB Output is correct
11 Correct 19 ms 20608 KB Output is correct
12 Correct 97 ms 27920 KB Output is correct
13 Correct 79 ms 27920 KB Output is correct
14 Correct 87 ms 27920 KB Output is correct
15 Correct 70 ms 27920 KB Output is correct
16 Correct 26 ms 27920 KB Output is correct
17 Correct 301 ms 30448 KB Output is correct
18 Correct 327 ms 31124 KB Output is correct
19 Correct 309 ms 32112 KB Output is correct
20 Correct 268 ms 32636 KB Output is correct
21 Correct 329 ms 33532 KB Output is correct
22 Correct 17 ms 33532 KB Output is correct
23 Correct 72 ms 33532 KB Output is correct
24 Correct 211 ms 39340 KB Output is correct
25 Correct 274 ms 39780 KB Output is correct
26 Correct 185 ms 39780 KB Output is correct
27 Correct 207 ms 39780 KB Output is correct
28 Correct 155 ms 39780 KB Output is correct
29 Correct 974 ms 42668 KB Output is correct
30 Correct 850 ms 42668 KB Output is correct
31 Execution timed out 1066 ms 44660 KB Time limit exceeded
32 Halted 0 ms 0 KB -