oj.uz

Submission #145562

# Submission time Handle Problem Language Result Execution time Memory
145562 2019-08-20T11:55:55 Z surface03 None (KOI17_civilization) C++14
100 / 100
 462 ms 63032 KB 
#include<bits/stdc++.h>
 
const int LM=2005;
const int KLM=(int)1e5+1;
 
int N,K,G[LM][LM],gCnt,group[KLM];
int ans, now;
int fr,re;
int dr[]={1,-1,0,0},dc[]={0,0,1,-1};
struct Civil{
    int r,c,lev;
}que[LM*LM];
void ffill(int r,int c){
    if(G[r][c]>=0)return;
    G[r][c]=gCnt;
    que[re++]={r,c,0};
    for(int k=0;k<4;k++){
        ffill(r+dr[k],c+dc[k]);
    }
}
void input(){
    scanf("%d%d",&N,&K);
    int i,j,r,c;
    for(i=0;i<K;i++){
        scanf("%d%d",&r,&c);
        G[r][c]=-1;
    }
    for(i=1;i<=N;i++)for(j=1;j<=N;j++){
        if(G[i][j]<0){
            gCnt++;
            ffill(i,j);
        }
    }
    for(i=1;i<=gCnt;i++)group[i]=i;
}
int Find(int n){
    if(n==group[n])return n;
    return group[n]=Find(group[n]);
}
int push(int r,int c,int lev){
    if(r<1||r>N||c<1||c>N||G[r][c])return 0;
    G[r][c]=now;
    que[re++]={r,c,lev};
    for(int k=0;k<4;k++){
        int nr=r+dr[k],nc=c+dc[k];
        if(nr<1||nr>N||nc<1||nc>N)continue;
        if(G[nr][nc]==0)continue;
        int next=Find(G[nr][nc]);
        if(now==next)continue;
        group[next]=now;
        gCnt--;
    }
    if(gCnt==1)ans=lev;
    return gCnt==1;
}
int BFS(){
    if(gCnt==1)return ans;
    while(fr<re){
        Civil&t=que[fr++];
        now=Find(G[t.r][t.c]);
        for(int k=0;k<4;k++){
            if(push(t.r+dr[k],t.c+dc[k],t.lev+1)){
                return ans;
            }
        }
    }
}
int main(){
    input();
    printf("%d\n",BFS());
}

Compilation message

civilization.cpp: In function 'void input()':
civilization.cpp:22:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&N,&K);
     ~~~~~^~~~~~~~~~~~~~
civilization.cpp:25:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&r,&c);
         ~~~~~^~~~~~~~~~~~~~
civilization.cpp: In function 'int BFS()':
civilization.cpp:67:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

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 760 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 900 KB Output is correct
10 Correct 2 ms 376 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 760 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 900 KB Output is correct
10 Correct 2 ms 376 KB Output is correct
11 Correct 3 ms 888 KB Output is correct
12 Correct 56 ms 18296 KB Output is correct
13 Correct 45 ms 14712 KB Output is correct
14 Correct 52 ms 17784 KB Output is correct
15 Correct 40 ms 13304 KB Output is correct
16 Correct 11 ms 3448 KB Output is correct
17 Correct 113 ms 20192 KB Output is correct
18 Correct 122 ms 20856 KB Output is correct
19 Correct 124 ms 20904 KB Output is correct
20 Correct 125 ms 20956 KB Output is correct
21 Correct 123 ms 20856 KB Output is correct
22 Correct 6 ms 504 KB Output is correct
23 Correct 55 ms 19960 KB Output is correct
24 Correct 3 ms 888 KB Output is correct

Subtask #3
46.0 / 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 760 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 900 KB Output is correct
10 Correct 2 ms 376 KB Output is correct
11 Correct 3 ms 888 KB Output is correct
12 Correct 56 ms 18296 KB Output is correct
13 Correct 45 ms 14712 KB Output is correct
14 Correct 52 ms 17784 KB Output is correct
15 Correct 40 ms 13304 KB Output is correct
16 Correct 11 ms 3448 KB Output is correct
17 Correct 113 ms 20192 KB Output is correct
18 Correct 122 ms 20856 KB Output is correct
19 Correct 124 ms 20904 KB Output is correct
20 Correct 125 ms 20956 KB Output is correct
21 Correct 123 ms 20856 KB Output is correct
22 Correct 6 ms 504 KB Output is correct
23 Correct 55 ms 19960 KB Output is correct
24 Correct 172 ms 42592 KB Output is correct
25 Correct 226 ms 51160 KB Output is correct
26 Correct 149 ms 34400 KB Output is correct
27 Correct 188 ms 42456 KB Output is correct
28 Correct 111 ms 27860 KB Output is correct
29 Correct 359 ms 61532 KB Output is correct
30 Correct 462 ms 62496 KB Output is correct
31 Correct 365 ms 62540 KB Output is correct
32 Correct 365 ms 61424 KB Output is correct
33 Correct 382 ms 63032 KB Output is correct
34 Correct 163 ms 51320 KB Output is correct
35 Correct 10 ms 504 KB Output is correct
36 Correct 3 ms 888 KB Output is correct