oj.uz

Submission #59109

# Submission time Handle Problem Language Result Execution time Memory
59109 2018-07-20T14:44:26 Z andy627 None (KOI17_civilization) C++17
54 / 100
 1000 ms 55988 KB 
#include <stdio.h>
#include <queue>
#include <algorithm>
#define INF 2e9
using namespace std;

int par[2002*2002];
int dist[2002][2002],num[2002][2002];
bool is_gone[2002][2002];
queue<int> qx,qy;

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

int find_(int x){
    if(par[x]==x) return x;
    return par[x]=find_(par[x]);
}

int main(){
    int n,k;

    scanf("%d %d",&n,&k);

    int pos=0;
    for(int i=1;i<=n;i++)
        for(int j=1;j<=n;j++) dist[i][j]=INF,num[i][j]=++pos;
    for(int i=1;i<=pos;i++) par[i]=i;

    for(int i=1;i<=k;i++){
        int a,b;
        scanf("%d %d",&a,&b);
        dist[a][b]=0;
        qx.push(a); qy.push(b);
    }

    int ans=0,cnt=0;
    for(;;ans++){
        while(!qx.empty()){
            int px=qx.front(); qx.pop();
            int py=qy.front(); qy.pop();

            if(dist[px][py]!=ans){
                qx.push(px); qy.push(py);
                break;
            }

            is_gone[px][py]=1; cnt++;
            for(int d=0;d<4;d++){
                int nx=px+dx[d];
                int ny=py+dy[d];

                if(nx<1 || nx>n || ny<1 || ny>n) continue;
                if(is_gone[nx][ny]){
                    int root_a=find_(num[nx][ny]);
                    int root_b=find_(num[px][py]);

                    if(root_a!=root_b) cnt--;
                    par[root_b]=root_a;
                }
                else if(dist[nx][ny]==INF){
                    dist[nx][ny]=dist[px][py]+1;
                    qx.push(nx); qy.push(ny);
                }
            }
        }
        if(cnt==1) break;
    }

    printf("%d\n",ans);

    return 0;
}

Compilation message

civilization.cpp: In function 'int main()':
civilization.cpp:23:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&n,&k);
     ~~~~~^~~~~~~~~~~~~~~
civilization.cpp:32:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d",&a,&b);
         ~~~~~^~~~~~~~~~~~~~~

Subtask #1
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1400 KB Output is correct
2 Correct 3 ms 1508 KB Output is correct
3 Correct 4 ms 1584 KB Output is correct
4 Correct 3 ms 1584 KB Output is correct
5 Correct 4 ms 1620 KB Output is correct
6 Correct 5 ms 1696 KB Output is correct
7 Correct 4 ms 1744 KB Output is correct
8 Correct 4 ms 1744 KB Output is correct
9 Correct 4 ms 1744 KB Output is correct
10 Correct 3 ms 1744 KB Output is correct
11 Correct 4 ms 1744 KB Output is correct
12 Correct 5 ms 1744 KB Output is correct

Subtask #2
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1400 KB Output is correct
2 Correct 3 ms 1508 KB Output is correct
3 Correct 4 ms 1584 KB Output is correct
4 Correct 3 ms 1584 KB Output is correct
5 Correct 4 ms 1620 KB Output is correct
6 Correct 5 ms 1696 KB Output is correct
7 Correct 4 ms 1744 KB Output is correct
8 Correct 4 ms 1744 KB Output is correct
9 Correct 4 ms 1744 KB Output is correct
10 Correct 3 ms 1744 KB Output is correct
11 Correct 4 ms 1744 KB Output is correct
12 Correct 148 ms 22204 KB Output is correct
13 Correct 103 ms 22204 KB Output is correct
14 Correct 128 ms 22204 KB Output is correct
15 Correct 96 ms 22204 KB Output is correct
16 Correct 27 ms 22204 KB Output is correct
17 Correct 462 ms 25188 KB Output is correct
18 Correct 579 ms 25188 KB Output is correct
19 Correct 551 ms 25188 KB Output is correct
20 Correct 565 ms 25316 KB Output is correct
21 Correct 522 ms 25316 KB Output is correct
22 Correct 20 ms 25316 KB Output is correct
23 Correct 58 ms 25316 KB Output is correct
24 Correct 5 ms 1744 KB Output is correct

Subtask #3
0 / 46.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1400 KB Output is correct
2 Correct 3 ms 1508 KB Output is correct
3 Correct 4 ms 1584 KB Output is correct
4 Correct 3 ms 1584 KB Output is correct
5 Correct 4 ms 1620 KB Output is correct
6 Correct 5 ms 1696 KB Output is correct
7 Correct 4 ms 1744 KB Output is correct
8 Correct 4 ms 1744 KB Output is correct
9 Correct 4 ms 1744 KB Output is correct
10 Correct 3 ms 1744 KB Output is correct
11 Correct 4 ms 1744 KB Output is correct
12 Correct 148 ms 22204 KB Output is correct
13 Correct 103 ms 22204 KB Output is correct
14 Correct 128 ms 22204 KB Output is correct
15 Correct 96 ms 22204 KB Output is correct
16 Correct 27 ms 22204 KB Output is correct
17 Correct 462 ms 25188 KB Output is correct
18 Correct 579 ms 25188 KB Output is correct
19 Correct 551 ms 25188 KB Output is correct
20 Correct 565 ms 25316 KB Output is correct
21 Correct 522 ms 25316 KB Output is correct
22 Correct 20 ms 25316 KB Output is correct
23 Correct 58 ms 25316 KB Output is correct
24 Correct 360 ms 51468 KB Output is correct
25 Correct 460 ms 51564 KB Output is correct
26 Correct 303 ms 51564 KB Output is correct
27 Correct 355 ms 51568 KB Output is correct
28 Correct 251 ms 51568 KB Output is correct
29 Execution timed out 1080 ms 55988 KB Time limit exceeded
30 Halted 0 ms 0 KB -