답안 #505093

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
505093	2022-01-10T13:21:15 Z	tgbegimx	Dynamite (POI11_dyn)	C++14	100 / 100	1081 ms	20600 KB

#include<cstdio>
  #include<cstring>
  #include<algorithm>
  using namespace std;
  const int N=300005,inf=0x3f3f3f3f;
  int p[N],noww[2*N],goal[2*N];
  int imp[N],unc[N],cov[N];
  int n,m,t1,t2,cnt,tot,l,r,mid,ans;
  void link(int f,int t)
 {
     noww[++cnt]=p[f];
     goal[cnt]=t,p[f]=cnt;
 }
 void DFS(int nde,int fth)
  {
     unc[nde]=-inf,cov[nde]=inf;
     for(int i=p[nde];i;i=noww[i])
        if(goal[i]!=fth)
         {

             DFS(goal[i],nde);
             unc[nde]=max(unc[nde],unc[goal[i]]+1);
             cov[nde]=min(cov[nde],cov[goal[i]]+1);
         }
        if(imp[nde]&&cov[nde]>mid) unc[nde]=max(unc[nde],0);
     if(unc[nde]+cov[nde]<=mid) unc[nde]=-inf;
     if(unc[nde]==mid) unc[nde]=-inf,cov[nde]=0,tot++;
 }
 bool check(int x)
 {
     tot=0; DFS(1,0);
     return tot+(unc[1]>=0)<=m;
 }
 int main ()
 {
     scanf("%d%d",&n,&m),r=n;
     for(int i=1;i<=n;i++)
         scanf("%d",&imp[i]);
     for(int i=1;i<n;i++)
     {
         scanf("%d%d",&t1,&t2);
         link(t1,t2),link(t2,t1);
     }
     while(l<=r)
     {
         mid=(l+r)/2;
         if(check(mid)) r=mid-1,ans=mid;
         else l=mid+1;
     }
     printf("%d",ans);
     return 0;
 }

Compilation message

dyn.cpp: In function 'void DFS(int, int)':
dyn.cpp:17:6: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   17 |      for(int i=p[nde];i;i=noww[i])
      |      ^~~
dyn.cpp:25:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   25 |         if(imp[nde]&&cov[nde]>mid) unc[nde]=max(unc[nde],0);
      |         ^~
dyn.cpp: In function 'int main()':
dyn.cpp:36:11: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |      scanf("%d%d",&n,&m),r=n;
      |      ~~~~~^~~~~~~~~~~~~~
dyn.cpp:38:15: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |          scanf("%d",&imp[i]);
      |          ~~~~~^~~~~~~~~~~~~~
dyn.cpp:41:15: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |          scanf("%d%d",&t1,&t2);
      |          ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	204 KB	Output is correct
2	Correct	1 ms	204 KB	Output is correct
3	Correct	0 ms	204 KB	Output is correct
4	Correct	0 ms	204 KB	Output is correct

Subtask #2
10.0 / 10.0

#	결과	메모리	Grader output
1	Correct	204 KB	Output is correct
2	Correct	204 KB	Output is correct
3	Correct	204 KB	Output is correct

Subtask #3
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	332 KB	Output is correct
2	Correct	0 ms	332 KB	Output is correct

Subtask #4
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	332 KB	Output is correct
2	Correct	1 ms	332 KB	Output is correct

Subtask #5
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	6 ms	588 KB	Output is correct
2	Correct	20 ms	972 KB	Output is correct
3	Correct	23 ms	1224 KB	Output is correct
4	Correct	28 ms	2980 KB	Output is correct

Subtask #6
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	50 ms	1792 KB	Output is correct
2	Correct	79 ms	2380 KB	Output is correct
3	Correct	98 ms	2792 KB	Output is correct
4	Correct	84 ms	5688 KB	Output is correct

Subtask #7
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	104 ms	3296 KB	Output is correct
2	Correct	106 ms	3408 KB	Output is correct
3	Correct	166 ms	3420 KB	Output is correct
4	Correct	132 ms	8368 KB	Output is correct

Subtask #8
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	410 ms	6632 KB	Output is correct
2	Correct	394 ms	7492 KB	Output is correct
3	Correct	807 ms	15648 KB	Output is correct
4	Correct	762 ms	15560 KB	Output is correct

Subtask #9
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	972 ms	12192 KB	Output is correct
2	Correct	741 ms	9648 KB	Output is correct
3	Correct	1081 ms	14892 KB	Output is correct

Subtask #10
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	935 ms	18584 KB	Output is correct
2	Correct	813 ms	9644 KB	Output is correct
3	Correct	992 ms	20600 KB	Output is correct
4	Correct	204 ms	9824 KB	Output is correct