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Submission #434915

# Submission time Handle Problem Language Result Execution time Memory
434915 2021-06-22T08:52:54 Z cpp219 Beads and wires (APIO14_beads) C++14
100 / 100
 420 ms 31180 KB 
#pragma GCC optimization O2
#pragma GCC optimization "unroll-loop"
#pragma target ("avx2")

#include <bits/stdc++.h>
#define ll int
#define ld long double
#define fs first
#define sc second
using namespace std;
typedef pair<ll,ll> LL;
const ll N = 2e5 + 9;
const ll inf = 1e9 + 7;
vector<LL> g[N];
ll n,x,y,w,dp[N][2][2],ans,val1[N],val2[N];

void DFS(ll u,ll p){
    ll child = 0; multiset<ll> s;
    for (auto i : g[u]) if (i.fs != p) DFS(i.fs,u),child++;
    dp[u][0][0] = dp[u][0][1] = 0;
    if (!child) dp[u][1][0] = dp[u][1][1] = -inf;
    for (auto i : g[u]){
        ll v = i.fs,cost = i.sc;
        if (v == p) continue;
        dp[u][0][0] += max(dp[v][1][0] + cost,dp[v][0][0]);
        val1[v] = dp[v][0][1] + cost - max(dp[v][1][0] + cost,dp[v][0][0]);
        val2[v] = dp[v][0][0] + cost - max(dp[v][1][0] + cost,dp[v][0][0]); s.insert(val2[v]);
    }
    for (auto i : g[u]){
        ll v = i.fs,cost = i.sc;
        if (v == p) continue;
        ll now = dp[u][0][0] - max(dp[v][1][0] + cost,dp[v][0][0]) + dp[v][0][0] + cost;
        dp[u][1][0] = max(dp[u][1][0],now);
        dp[u][1][1] = max(dp[u][1][1],now - dp[v][0][0] + dp[v][0][1]);
    }
    for (auto i : g[u]){
        ll v = i.fs,cost = i.sc;
        if (v == p) continue;
        ll now = dp[u][0][0] - max(dp[v][1][0] + cost,dp[v][0][0]) + max(dp[v][1][1] + cost,dp[v][0][1]);
        dp[u][0][1] = max(dp[u][0][1],now);
    }


    if (child < 2) return;
    for (auto i : g[u]){
        ll v = i.fs,cost = i.sc;
        if (v == p) continue;
        s.erase(s.find(val2[v]));
        dp[u][0][1] = max(dp[u][0][1],dp[u][0][0] + val1[v] + *s.rbegin());
        s.insert(val2[v]);
    }
}
int main(){
    ios_base::sync_with_stdio(NULL); cin.tie(0); cout.tie(0);
    #define task "test"
    if (fopen(task".INP","r")){
        freopen(task".INP","r",stdin);
        freopen(task".OUT","w",stdout);
    }
    cin>>n;
    for (ll i = 1;i < n;i++){
        cin>>x>>y>>w;
        g[x].push_back({y,w}); g[y].push_back({x,w});
    }
    DFS(1,0); //cout<<dp[1][0][0]<<" "<<dp[1][0][1]; return 0;
    cout<<max(dp[1][0][0],dp[1][0][1]);
}

Compilation message

beads.cpp:1: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    1 | #pragma GCC optimization O2
      | 
beads.cpp:2: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    2 | #pragma GCC optimization "unroll-loop"
      | 
beads.cpp:3: warning: ignoring '#pragma target ' [-Wunknown-pragmas]
    3 | #pragma target ("avx2")
      | 
beads.cpp: In function 'void DFS(int, int)':
beads.cpp:46:21: warning: unused variable 'cost' [-Wunused-variable]
   46 |         ll v = i.fs,cost = i.sc;
      |                     ^~~~
beads.cpp: In function 'int main()':
beads.cpp:57:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   57 |         freopen(task".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
beads.cpp:58:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   58 |         freopen(task".OUT","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 4 ms 4940 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 4 ms 4940 KB Output is correct
5 Correct 4 ms 4940 KB Output is correct
6 Correct 4 ms 4940 KB Output is correct
7 Correct 4 ms 4940 KB Output is correct
8 Correct 3 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 4 ms 4940 KB Output is correct
11 Correct 3 ms 4940 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 4 ms 4940 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 4 ms 4940 KB Output is correct
5 Correct 4 ms 4940 KB Output is correct
6 Correct 4 ms 4940 KB Output is correct
7 Correct 4 ms 4940 KB Output is correct
8 Correct 3 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 4 ms 4940 KB Output is correct
11 Correct 3 ms 4940 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 3 ms 4940 KB Output is correct
15 Correct 3 ms 4940 KB Output is correct
16 Correct 4 ms 5016 KB Output is correct
17 Correct 5 ms 4940 KB Output is correct
18 Correct 4 ms 4940 KB Output is correct
19 Correct 4 ms 4940 KB Output is correct
20 Correct 4 ms 4940 KB Output is correct
21 Correct 4 ms 4940 KB Output is correct
22 Correct 4 ms 4940 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 4 ms 4940 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 4 ms 4940 KB Output is correct
5 Correct 4 ms 4940 KB Output is correct
6 Correct 4 ms 4940 KB Output is correct
7 Correct 4 ms 4940 KB Output is correct
8 Correct 3 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 4 ms 4940 KB Output is correct
11 Correct 3 ms 4940 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 3 ms 4940 KB Output is correct
15 Correct 3 ms 4940 KB Output is correct
16 Correct 4 ms 5016 KB Output is correct
17 Correct 5 ms 4940 KB Output is correct
18 Correct 4 ms 4940 KB Output is correct
19 Correct 4 ms 4940 KB Output is correct
20 Correct 4 ms 4940 KB Output is correct
21 Correct 4 ms 4940 KB Output is correct
22 Correct 4 ms 4940 KB Output is correct
23 Correct 7 ms 5208 KB Output is correct
24 Correct 6 ms 5324 KB Output is correct
25 Correct 6 ms 5324 KB Output is correct
26 Correct 11 ms 5580 KB Output is correct
27 Correct 10 ms 5708 KB Output is correct
28 Correct 14 ms 6176 KB Output is correct
29 Correct 14 ms 5944 KB Output is correct
30 Correct 12 ms 5960 KB Output is correct
31 Correct 12 ms 6476 KB Output is correct

Subtask #4
43.0 / 43.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 4 ms 4940 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 4 ms 4940 KB Output is correct
5 Correct 4 ms 4940 KB Output is correct
6 Correct 4 ms 4940 KB Output is correct
7 Correct 4 ms 4940 KB Output is correct
8 Correct 3 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 4 ms 4940 KB Output is correct
11 Correct 3 ms 4940 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 3 ms 4940 KB Output is correct
15 Correct 3 ms 4940 KB Output is correct
16 Correct 4 ms 5016 KB Output is correct
17 Correct 5 ms 4940 KB Output is correct
18 Correct 4 ms 4940 KB Output is correct
19 Correct 4 ms 4940 KB Output is correct
20 Correct 4 ms 4940 KB Output is correct
21 Correct 4 ms 4940 KB Output is correct
22 Correct 4 ms 4940 KB Output is correct
23 Correct 7 ms 5208 KB Output is correct
24 Correct 6 ms 5324 KB Output is correct
25 Correct 6 ms 5324 KB Output is correct
26 Correct 11 ms 5580 KB Output is correct
27 Correct 10 ms 5708 KB Output is correct
28 Correct 14 ms 6176 KB Output is correct
29 Correct 14 ms 5944 KB Output is correct
30 Correct 12 ms 5960 KB Output is correct
31 Correct 12 ms 6476 KB Output is correct
32 Correct 53 ms 8832 KB Output is correct
33 Correct 42 ms 8772 KB Output is correct
34 Correct 40 ms 8772 KB Output is correct
35 Correct 257 ms 20592 KB Output is correct
36 Correct 305 ms 20668 KB Output is correct
37 Correct 246 ms 20688 KB Output is correct
38 Correct 420 ms 29544 KB Output is correct
39 Correct 363 ms 24812 KB Output is correct
40 Correct 401 ms 23852 KB Output is correct
41 Correct 324 ms 31180 KB Output is correct