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Submission #106928

# Submission time Handle Problem Language Result Execution time Memory
106928 2019-04-21T06:37:58 Z nxteru Beads and wires (APIO14_beads) C++14
100 / 100
 241 ms 26212 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef double D;
typedef pair<ll,ll> P;
#define M 1000000007
#define F first
#define S second
#define PB push_back
#define INF 1000000000000000000
int n;
ll da[200005],db[200005],dc[200005],dd[200005];
vector<P>g[200005];
void up(ll &x,ll y){
	if(x<y)x=y;
}
void dfs(int v,int p,ll pc){
	ll sa=0,sm=-INF,acc=-INF,acd=-INF,dm=-INF;
	for(int i=0;i<g[v].size();i++){
		int u=g[v][i].F;
		ll c=g[v][i].S;
		if(u==p)continue;
		dfs(u,v,c);
		sa+=da[u];
		up(sm,-da[u]+db[u]);
		up(dm,acc-da[u]+c+dd[u]);
		up(dm,acd-da[u]+c+dc[u]);
		up(acc,-da[u]+c+dc[u]);
		up(acd,-da[u]+c+dd[u]);
	}
	up(dc[v],sa);
	up(dd[v],sa);
	up(dd[v],sa+sm);
	up(da[v],sa+acc+pc);
	up(db[v],sa+acd+pc);
	up(dd[v],sa+dm);
	up(da[v],dc[v]);
	up(db[v],dd[v]);
}
int main(void){
	scanf("%d",&n);
	for(int i=0;i<n-1;i++){
		ll a,b,c;
		scanf("%lld%lld%lld",&a,&b,&c);
		g[--a].PB(P(--b,c));
		g[b].PB(P(a,c));
	}
	for(int i=0;i<n;i++)da[i]=-INF,db[i]=-INF,dc[i]=-INF,dd[i]=-INF;
	dfs(0,-1,-INF);
	printf("%lld\n",dd[0]);
}

Compilation message

beads.cpp: In function 'void dfs(int, int, ll)':
beads.cpp:19:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<g[v].size();i++){
              ~^~~~~~~~~~~~
beads.cpp: In function 'int main()':
beads.cpp:41:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
beads.cpp:44:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld%lld%lld",&a,&b,&c);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 5120 KB Output is correct
2 Correct 6 ms 5120 KB Output is correct
3 Correct 5 ms 4992 KB Output is correct
4 Correct 6 ms 5120 KB Output is correct
5 Correct 5 ms 4992 KB Output is correct
6 Correct 6 ms 4992 KB Output is correct
7 Correct 6 ms 4992 KB Output is correct
8 Correct 6 ms 4992 KB Output is correct
9 Correct 6 ms 4992 KB Output is correct
10 Correct 6 ms 4992 KB Output is correct
11 Correct 5 ms 4992 KB Output is correct
12 Correct 6 ms 4992 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 5120 KB Output is correct
2 Correct 6 ms 5120 KB Output is correct
3 Correct 5 ms 4992 KB Output is correct
4 Correct 6 ms 5120 KB Output is correct
5 Correct 5 ms 4992 KB Output is correct
6 Correct 6 ms 4992 KB Output is correct
7 Correct 6 ms 4992 KB Output is correct
8 Correct 6 ms 4992 KB Output is correct
9 Correct 6 ms 4992 KB Output is correct
10 Correct 6 ms 4992 KB Output is correct
11 Correct 5 ms 4992 KB Output is correct
12 Correct 6 ms 4992 KB Output is correct
13 Correct 6 ms 4992 KB Output is correct
14 Correct 5 ms 4992 KB Output is correct
15 Correct 6 ms 4992 KB Output is correct
16 Correct 6 ms 5040 KB Output is correct
17 Correct 5 ms 4992 KB Output is correct
18 Correct 6 ms 4992 KB Output is correct
19 Correct 6 ms 5120 KB Output is correct
20 Correct 6 ms 4992 KB Output is correct
21 Correct 6 ms 5120 KB Output is correct
22 Correct 5 ms 5120 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 5120 KB Output is correct
2 Correct 6 ms 5120 KB Output is correct
3 Correct 5 ms 4992 KB Output is correct
4 Correct 6 ms 5120 KB Output is correct
5 Correct 5 ms 4992 KB Output is correct
6 Correct 6 ms 4992 KB Output is correct
7 Correct 6 ms 4992 KB Output is correct
8 Correct 6 ms 4992 KB Output is correct
9 Correct 6 ms 4992 KB Output is correct
10 Correct 6 ms 4992 KB Output is correct
11 Correct 5 ms 4992 KB Output is correct
12 Correct 6 ms 4992 KB Output is correct
13 Correct 6 ms 4992 KB Output is correct
14 Correct 5 ms 4992 KB Output is correct
15 Correct 6 ms 4992 KB Output is correct
16 Correct 6 ms 5040 KB Output is correct
17 Correct 5 ms 4992 KB Output is correct
18 Correct 6 ms 4992 KB Output is correct
19 Correct 6 ms 5120 KB Output is correct
20 Correct 6 ms 4992 KB Output is correct
21 Correct 6 ms 5120 KB Output is correct
22 Correct 5 ms 5120 KB Output is correct
23 Correct 8 ms 5504 KB Output is correct
24 Correct 8 ms 5376 KB Output is correct
25 Correct 8 ms 5376 KB Output is correct
26 Correct 11 ms 5888 KB Output is correct
27 Correct 11 ms 5888 KB Output is correct
28 Correct 10 ms 5884 KB Output is correct
29 Correct 11 ms 5760 KB Output is correct
30 Correct 10 ms 5888 KB Output is correct
31 Correct 12 ms 6296 KB Output is correct

Subtask #4
43.0 / 43.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 5120 KB Output is correct
2 Correct 6 ms 5120 KB Output is correct
3 Correct 5 ms 4992 KB Output is correct
4 Correct 6 ms 5120 KB Output is correct
5 Correct 5 ms 4992 KB Output is correct
6 Correct 6 ms 4992 KB Output is correct
7 Correct 6 ms 4992 KB Output is correct
8 Correct 6 ms 4992 KB Output is correct
9 Correct 6 ms 4992 KB Output is correct
10 Correct 6 ms 4992 KB Output is correct
11 Correct 5 ms 4992 KB Output is correct
12 Correct 6 ms 4992 KB Output is correct
13 Correct 6 ms 4992 KB Output is correct
14 Correct 5 ms 4992 KB Output is correct
15 Correct 6 ms 4992 KB Output is correct
16 Correct 6 ms 5040 KB Output is correct
17 Correct 5 ms 4992 KB Output is correct
18 Correct 6 ms 4992 KB Output is correct
19 Correct 6 ms 5120 KB Output is correct
20 Correct 6 ms 4992 KB Output is correct
21 Correct 6 ms 5120 KB Output is correct
22 Correct 5 ms 5120 KB Output is correct
23 Correct 8 ms 5504 KB Output is correct
24 Correct 8 ms 5376 KB Output is correct
25 Correct 8 ms 5376 KB Output is correct
26 Correct 11 ms 5888 KB Output is correct
27 Correct 11 ms 5888 KB Output is correct
28 Correct 10 ms 5884 KB Output is correct
29 Correct 11 ms 5760 KB Output is correct
30 Correct 10 ms 5888 KB Output is correct
31 Correct 12 ms 6296 KB Output is correct
32 Correct 43 ms 9212 KB Output is correct
33 Correct 44 ms 9208 KB Output is correct
34 Correct 47 ms 9252 KB Output is correct
35 Correct 228 ms 21496 KB Output is correct
36 Correct 241 ms 21624 KB Output is correct
37 Correct 238 ms 21628 KB Output is correct
38 Correct 161 ms 20732 KB Output is correct
39 Correct 152 ms 20700 KB Output is correct
40 Correct 153 ms 20696 KB Output is correct
41 Correct 218 ms 26212 KB Output is correct