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Submission #1003660

# Submission time Handle Problem Language Result Execution time Memory
1003660 2024-06-20T14:49:05 Z bachhoangxuan Islands (IOI08_islands) C++17
21 / 100
 135 ms 35328 KB 
#include<bits/stdc++.h>
using namespace std;
const int maxn = 1e6+5;
const int inf = 1e9;
int N,P[maxn],L[maxn],dp[maxn],mx[maxn],res;
int deg[maxn];

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);cout.tie(NULL);
    cin >> N;
    for(int i=1;i<=N;i++){
        cin >> P[i] >> L[i];
        deg[P[i]]++;
    }
    queue<int> q;
    for(int i=1;i<=N;i++) if(!deg[i]) q.push(i);
    while(!q.empty()){
        int u=q.front(),p=P[u];q.pop();
        mx[p]=max({mx[p],mx[u],dp[p]+dp[u]+L[u]});
        dp[p]=max(dp[p],dp[u]+L[u]);
        if(!(--deg[p])) q.push(p);
    }
    for(int i=1;i<=N;i++){
        if(!deg[i]) continue;
        vector<int> cycle;
        int u=i,ans=0,total=0;
        while(deg[u]){
            ans=max(ans,mx[u]);
            total+=L[u];
            cycle.push_back(u);
            deg[u]=0;u=P[u];
        }
        int m1=-inf,m2=-inf;
        for(int v:cycle){
            ans=max({ans,m1+dp[v],m2+dp[v]+total});
            m1=max(m1,dp[v])+L[v];
            m2=max(m2,dp[v])-L[v];
        }
        res+=ans;
    }
    cout << res << '\n';
}

Subtask #1
21.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4440 KB Output is correct
2 Correct 1 ms 4444 KB Output is correct
3 Incorrect 1 ms 4444 KB Output isn't correct
4 Correct 1 ms 4444 KB Output is correct
5 Correct 1 ms 4444 KB Output is correct
6 Correct 1 ms 4444 KB Output is correct
7 Correct 1 ms 4444 KB Output is correct
8 Incorrect 1 ms 4444 KB Output isn't correct
9 Incorrect 1 ms 4560 KB Output isn't correct
10 Correct 1 ms 4444 KB Output is correct
11 Incorrect 1 ms 4440 KB Output isn't correct

Subtask #2
0 / 3.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 4444 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 4444 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 4956 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 8 ms 8028 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 25 ms 13128 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 60 ms 19060 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 132 ms 31308 KB Output is correct
2 Incorrect 135 ms 34948 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 127 ms 35328 KB Output isn't correct
2 Halted 0 ms 0 KB -