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Submission #135053

# Submission time Handle Problem Language Result Execution time Memory
135053 2019-07-23T15:05:05 Z arthur_nascimento Beads and wires (APIO14_beads) C++14
28 / 100
 1000 ms 1144 KB 
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define maxn 10100

#define pii pair<int,int>

vector<pii> L[maxn];

int dp[2][2][maxn];

int get(int hat,int need,int vx,int p=-1){
  //  fprintf(stderr,"%d %d %d\n",need,vx,p);
     int &r = dp[hat][need][vx];
    if(r+1) return r;
    
    r = 0;
    int l = L[vx].size();
    if(need == 0){
        
        if(hat) {
            
            int stot= 0;
            vector<int> ss;
            for(int k=0;k<l;k++){
                    int to = L[vx][k].first;  //  fprintf(stderr,"to %d\n",to);
                    if(to != p)stot += max(get(0,0,to,vx), get(0,1,to,vx) + L[vx][k].second),
                                 ss.pb(max(get(0,0,to,vx), get(0,1,to,vx) + L[vx][k].second));
                    else ss.pb(0);
            }
            
            for(int i=0;i<l;i++)for(int j=i+1;j<l;j++){
                int A = L[vx][i].first, B = L[vx][j].first;
                if(A == p || B == p) continue;
                
                int s = max (L[vx][i].second + L[vx][j].second + get(0,0,A,vx) + get(1,0,B,vx),
                             L[vx][i].second + L[vx][j].second + get(1,0,A,vx) + get(0,0,B,vx));
                             
               /* for(int k=0;k<l;k++){
                    int to = L[vx][k].first;  //  fprintf(stderr,"to %d\n",to);
                    if(to != A && to != B && to != p) s += max(get(0,0,to,vx), get(0,1,to,vx) + L[vx][k].second);
                }*/
                s += stot - ss[i] - ss[j];
                r = max(r,s);
            }
        }
        int no = 0;
        for(int spec=0;spec<l;spec++){
            no=0;
            for(int k=0;k<l;k++){
                    int to = L[vx][k].first;
                    int hh = (hat && (spec==k));
                    if(to != p) no += max(get(hh,0,to,vx), get(hh,1,to,vx) + L[vx][k].second);
            }
            r = max(r,no);
        }
        r = max(r,no);
       // fprintf(stderr,"dp[%d][%d]=%d\n",need,vx,r);
        return r;
    }
    
    if(L[vx].size()==1){ 
        r = -1e7;
        return r;
    }
    
    int st = 0;
    vector<int> vs;
    for(int j=0;j<L[vx].size();j++){
            int to = L[vx][j].first;
            if(to == p ) vs.pb(0);
            else
                 st += max(get(0,0,to,vx), get(0,1,to,vx) + L[vx][j].second),
                 vs.pb(max(get(0,0,to,vx), get(0,1,to,vx) + L[vx][j].second));
        }
    
    for(int i=0;i<L[vx].size();i++){
        int s = 0;
        if(L[vx][i].first == p) continue;
        s = L[vx][i].second + get(hat,0,L[vx][i].first,vx);
        s += st - vs[i];
        r = max(r,s);
    }
    return r;
    
}

int main() {
    int n;
    scanf("%d",&n);
    for(int i=0;i<n-1;i++){
        int a,b,c;
        scanf("%d%d%d",&a,&b,&c), a--, b--;
        L[a].pb(pii(b,c));
        L[b].pb(pii(a,c));
    }
    memset(dp,-1,sizeof(dp));
    printf("%d\n",get(1,0,0));
    //printf("%d\n",get(0,0,1));
}

Compilation message

beads.cpp: In function 'int get(int, int, int, int)':
beads.cpp:69:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int j=0;j<L[vx].size();j++){
                 ~^~~~~~~~~~~~~
beads.cpp:77:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<L[vx].size();i++){
                 ~^~~~~~~~~~~~~
beads.cpp: In function 'int main()':
beads.cpp:90:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
     ~~~~~^~~~~~~~~
beads.cpp:93:38: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d%d",&a,&b,&c), a--, b--;
         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 888 KB Output is correct
2 Correct 2 ms 632 KB Output is correct
3 Correct 2 ms 632 KB Output is correct
4 Correct 2 ms 760 KB Output is correct
5 Correct 2 ms 760 KB Output is correct
6 Correct 2 ms 632 KB Output is correct
7 Correct 2 ms 760 KB Output is correct
8 Correct 2 ms 632 KB Output is correct
9 Correct 2 ms 760 KB Output is correct
10 Correct 2 ms 760 KB Output is correct
11 Correct 2 ms 632 KB Output is correct
12 Correct 0 ms 636 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 888 KB Output is correct
2 Correct 2 ms 632 KB Output is correct
3 Correct 2 ms 632 KB Output is correct
4 Correct 2 ms 760 KB Output is correct
5 Correct 2 ms 760 KB Output is correct
6 Correct 2 ms 632 KB Output is correct
7 Correct 2 ms 760 KB Output is correct
8 Correct 2 ms 632 KB Output is correct
9 Correct 2 ms 760 KB Output is correct
10 Correct 2 ms 760 KB Output is correct
11 Correct 2 ms 632 KB Output is correct
12 Correct 0 ms 636 KB Output is correct
13 Correct 3 ms 760 KB Output is correct
14 Correct 3 ms 732 KB Output is correct
15 Correct 3 ms 760 KB Output is correct
16 Correct 3 ms 760 KB Output is correct
17 Correct 3 ms 760 KB Output is correct
18 Correct 2 ms 760 KB Output is correct
19 Correct 4 ms 760 KB Output is correct
20 Correct 3 ms 760 KB Output is correct
21 Correct 4 ms 760 KB Output is correct
22 Correct 3 ms 760 KB Output is correct

Subtask #3
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 888 KB Output is correct
2 Correct 2 ms 632 KB Output is correct
3 Correct 2 ms 632 KB Output is correct
4 Correct 2 ms 760 KB Output is correct
5 Correct 2 ms 760 KB Output is correct
6 Correct 2 ms 632 KB Output is correct
7 Correct 2 ms 760 KB Output is correct
8 Correct 2 ms 632 KB Output is correct
9 Correct 2 ms 760 KB Output is correct
10 Correct 2 ms 760 KB Output is correct
11 Correct 2 ms 632 KB Output is correct
12 Correct 0 ms 636 KB Output is correct
13 Correct 3 ms 760 KB Output is correct
14 Correct 3 ms 732 KB Output is correct
15 Correct 3 ms 760 KB Output is correct
16 Correct 3 ms 760 KB Output is correct
17 Correct 3 ms 760 KB Output is correct
18 Correct 2 ms 760 KB Output is correct
19 Correct 4 ms 760 KB Output is correct
20 Correct 3 ms 760 KB Output is correct
21 Correct 4 ms 760 KB Output is correct
22 Correct 3 ms 760 KB Output is correct
23 Correct 8 ms 940 KB Output is correct
24 Correct 8 ms 888 KB Output is correct
25 Correct 8 ms 888 KB Output is correct
26 Correct 14 ms 1132 KB Output is correct
27 Correct 14 ms 1144 KB Output is correct
28 Execution timed out 1092 ms 1144 KB Time limit exceeded
29 Halted 0 ms 0 KB -

Subtask #4
0 / 43.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 888 KB Output is correct
2 Correct 2 ms 632 KB Output is correct
3 Correct 2 ms 632 KB Output is correct
4 Correct 2 ms 760 KB Output is correct
5 Correct 2 ms 760 KB Output is correct
6 Correct 2 ms 632 KB Output is correct
7 Correct 2 ms 760 KB Output is correct
8 Correct 2 ms 632 KB Output is correct
9 Correct 2 ms 760 KB Output is correct
10 Correct 2 ms 760 KB Output is correct
11 Correct 2 ms 632 KB Output is correct
12 Correct 0 ms 636 KB Output is correct
13 Correct 3 ms 760 KB Output is correct
14 Correct 3 ms 732 KB Output is correct
15 Correct 3 ms 760 KB Output is correct
16 Correct 3 ms 760 KB Output is correct
17 Correct 3 ms 760 KB Output is correct
18 Correct 2 ms 760 KB Output is correct
19 Correct 4 ms 760 KB Output is correct
20 Correct 3 ms 760 KB Output is correct
21 Correct 4 ms 760 KB Output is correct
22 Correct 3 ms 760 KB Output is correct
23 Correct 8 ms 940 KB Output is correct
24 Correct 8 ms 888 KB Output is correct
25 Correct 8 ms 888 KB Output is correct
26 Correct 14 ms 1132 KB Output is correct
27 Correct 14 ms 1144 KB Output is correct
28 Execution timed out 1092 ms 1144 KB Time limit exceeded
29 Halted 0 ms 0 KB -