oj.uz

Submission #697746

# Submission time Handle Problem Language Result Execution time Memory
697746 2023-02-11T02:58:40 Z WHC_MIK_7521X Beads and wires (APIO14_beads) C++17
100 / 100
 97 ms 20644 KB 
#include<bits/stdc++.h>
using namespace std;
const int N=2e5+10;
struct edge{
    int w,to,nxt;
};
edge ed[N<<1];
int cnt,h[N];
void add(int st,int et,int wi){
    cnt++;
    ed[cnt].to=et;
    ed[cnt].w=wi;
    ed[cnt].nxt=h[st];
    h[st]=cnt;
}
int sum[N][3],dp[N][3][2],n;
void dfs(int x,int fa){
    sum[x][0]=0;
    dp[x][0][0]=0;
    for(int i=h[x];i;i=ed[i].nxt){
        int v=ed[i].to;
        if(v==fa)continue;
        dfs(v,x);
        dp[x][2][1]=max({dp[x][2][1]+max(dp[v][1][0]+ed[i].w,dp[v][0][0]),dp[x][1][0]+ed[i].w+max(sum[v][2],dp[v][0][1]),dp[x][1][1]+ed[i].w+dp[v][0][0]});
        dp[x][2][0]=max({dp[x][2][0]+max(dp[v][1][0]+ed[i].w,dp[v][0][0]),dp[x][1][0]+ed[i].w+dp[v][0][0]});
        dp[x][1][1]=max({dp[x][1][1]+max(dp[v][1][0]+ed[i].w,dp[v][0][0]),dp[x][0][0]+ed[i].w+max(sum[v][2],dp[v][0][1])});
        dp[x][1][0]=max({dp[x][1][0]+max(dp[v][1][0]+ed[i].w,dp[v][0][0]),dp[x][0][0]+ed[i].w+dp[v][0][0]});
        dp[x][0][1]=max({dp[x][0][1]+max(dp[v][1][0]+ed[i].w,dp[v][0][0]),dp[x][0][0]+max({ed[i].w+dp[v][1][1],sum[v][2],dp[v][0][1]})});
        dp[x][0][0]=dp[x][0][0]+max(dp[v][1][0]+ed[i].w,dp[v][0][0]);
    }
    sum[x][0]=max(dp[x][0][0],dp[x][0][1]);
    sum[x][1]=max(dp[x][1][0],dp[x][1][1]);
    sum[x][2]=max(dp[x][2][0],dp[x][2][1]);
}
int main(){
    scanf("%d",&n);
    for(int i=1,x,y,w;i<n;i++){
        scanf("%d%d%d",&x,&y,&w);
        add(x,y,w);
        add(y,x,w);
    }
    memset(dp,-63,sizeof dp);
    memset(sum,-63,sizeof sum);
    dfs(1,0);
    printf("%d",max(sum[1][0],sum[1][2]));
    return 0;
}

Compilation message

beads.cpp: In function 'int main()':
beads.cpp:36:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
beads.cpp:38:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |         scanf("%d%d%d",&x,&y,&w);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 7252 KB Output is correct
2 Correct 3 ms 7252 KB Output is correct
3 Correct 3 ms 7252 KB Output is correct
4 Correct 3 ms 7252 KB Output is correct
5 Correct 3 ms 7268 KB Output is correct
6 Correct 3 ms 7252 KB Output is correct
7 Correct 3 ms 7348 KB Output is correct
8 Correct 3 ms 7252 KB Output is correct
9 Correct 3 ms 7240 KB Output is correct
10 Correct 3 ms 7252 KB Output is correct
11 Correct 3 ms 7252 KB Output is correct
12 Correct 3 ms 7252 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 7252 KB Output is correct
2 Correct 3 ms 7252 KB Output is correct
3 Correct 3 ms 7252 KB Output is correct
4 Correct 3 ms 7252 KB Output is correct
5 Correct 3 ms 7268 KB Output is correct
6 Correct 3 ms 7252 KB Output is correct
7 Correct 3 ms 7348 KB Output is correct
8 Correct 3 ms 7252 KB Output is correct
9 Correct 3 ms 7240 KB Output is correct
10 Correct 3 ms 7252 KB Output is correct
11 Correct 3 ms 7252 KB Output is correct
12 Correct 3 ms 7252 KB Output is correct
13 Correct 3 ms 7252 KB Output is correct
14 Correct 3 ms 7340 KB Output is correct
15 Correct 3 ms 7252 KB Output is correct
16 Correct 3 ms 7348 KB Output is correct
17 Correct 4 ms 7252 KB Output is correct
18 Correct 4 ms 7252 KB Output is correct
19 Correct 4 ms 7352 KB Output is correct
20 Correct 3 ms 7312 KB Output is correct
21 Correct 3 ms 7252 KB Output is correct
22 Correct 4 ms 7252 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 7252 KB Output is correct
2 Correct 3 ms 7252 KB Output is correct
3 Correct 3 ms 7252 KB Output is correct
4 Correct 3 ms 7252 KB Output is correct
5 Correct 3 ms 7268 KB Output is correct
6 Correct 3 ms 7252 KB Output is correct
7 Correct 3 ms 7348 KB Output is correct
8 Correct 3 ms 7252 KB Output is correct
9 Correct 3 ms 7240 KB Output is correct
10 Correct 3 ms 7252 KB Output is correct
11 Correct 3 ms 7252 KB Output is correct
12 Correct 3 ms 7252 KB Output is correct
13 Correct 3 ms 7252 KB Output is correct
14 Correct 3 ms 7340 KB Output is correct
15 Correct 3 ms 7252 KB Output is correct
16 Correct 3 ms 7348 KB Output is correct
17 Correct 4 ms 7252 KB Output is correct
18 Correct 4 ms 7252 KB Output is correct
19 Correct 4 ms 7352 KB Output is correct
20 Correct 3 ms 7312 KB Output is correct
21 Correct 3 ms 7252 KB Output is correct
22 Correct 4 ms 7252 KB Output is correct
23 Correct 5 ms 7460 KB Output is correct
24 Correct 4 ms 7488 KB Output is correct
25 Correct 5 ms 7484 KB Output is correct
26 Correct 6 ms 7788 KB Output is correct
27 Correct 6 ms 7740 KB Output is correct
28 Correct 7 ms 7764 KB Output is correct
29 Correct 6 ms 7744 KB Output is correct
30 Correct 6 ms 7744 KB Output is correct
31 Correct 6 ms 8124 KB Output is correct

Subtask #4
43.0 / 43.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 7252 KB Output is correct
2 Correct 3 ms 7252 KB Output is correct
3 Correct 3 ms 7252 KB Output is correct
4 Correct 3 ms 7252 KB Output is correct
5 Correct 3 ms 7268 KB Output is correct
6 Correct 3 ms 7252 KB Output is correct
7 Correct 3 ms 7348 KB Output is correct
8 Correct 3 ms 7252 KB Output is correct
9 Correct 3 ms 7240 KB Output is correct
10 Correct 3 ms 7252 KB Output is correct
11 Correct 3 ms 7252 KB Output is correct
12 Correct 3 ms 7252 KB Output is correct
13 Correct 3 ms 7252 KB Output is correct
14 Correct 3 ms 7340 KB Output is correct
15 Correct 3 ms 7252 KB Output is correct
16 Correct 3 ms 7348 KB Output is correct
17 Correct 4 ms 7252 KB Output is correct
18 Correct 4 ms 7252 KB Output is correct
19 Correct 4 ms 7352 KB Output is correct
20 Correct 3 ms 7312 KB Output is correct
21 Correct 3 ms 7252 KB Output is correct
22 Correct 4 ms 7252 KB Output is correct
23 Correct 5 ms 7460 KB Output is correct
24 Correct 4 ms 7488 KB Output is correct
25 Correct 5 ms 7484 KB Output is correct
26 Correct 6 ms 7788 KB Output is correct
27 Correct 6 ms 7740 KB Output is correct
28 Correct 7 ms 7764 KB Output is correct
29 Correct 6 ms 7744 KB Output is correct
30 Correct 6 ms 7744 KB Output is correct
31 Correct 6 ms 8124 KB Output is correct
32 Correct 21 ms 9448 KB Output is correct
33 Correct 19 ms 9468 KB Output is correct
34 Correct 18 ms 9380 KB Output is correct
35 Correct 86 ms 16188 KB Output is correct
36 Correct 94 ms 16184 KB Output is correct
37 Correct 88 ms 16204 KB Output is correct
38 Correct 75 ms 16312 KB Output is correct
39 Correct 80 ms 16332 KB Output is correct
40 Correct 71 ms 16332 KB Output is correct
41 Correct 97 ms 20644 KB Output is correct