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Submission #450612

# Submission time Handle Problem Language Result Execution time Memory
450612 2021-08-03T03:05:53 Z czhang2718 Toll (BOI17_toll) C++14
7 / 100
 303 ms 28716 KB 
#include<bits/stdc++.h>
using namespace std;

#define rep(i, a, b) for(int i=a; i<=b; i++)
#define trav(x, a) for(auto &x:a)
#define all(x) x.begin(), x.end()
#define f first
#define s second
#define nl '\n'
#define pb push_back
typedef vector<int> vi;
typedef pair<int, int> pii;
typedef long long ll;

int n, m, k, q;
vector<pii> adj[50006];
vector<pii> radj[50006];
int lx[10006];
int rx[10006];
ll ans[10006];
map<pii, int> edge;

vector<vector<ll>> calc(int l, int r, vi &qu){
  vector<vector<ll>> vec(k*(r-l+1), vector<ll>(2*k));
  if(r-l==1){
    rep(i, 0, k-1){
      rep(j, 0, k-1){
        int t=edge[{l*k+i, r*k+j}];
        vec[i][k+j]=vec[k+j][i]=(t?t:1e10);
      }
    }
    return vec;
  }
  int m=(l+r)/2;
  vi lq, rq;
  trav(i, qu){
    if(rx[i]/k<m) lq.pb(i);
    if(lx[i]/k>m) rq.pb(i);
  }
  vector<vector<ll>> lvec=calc(l, m, lq);
  vector<vector<ll>> rvec=calc(m, r, rq);

  trav(i, qu){
    if(rx[i]/k<m || lx[i]/k>m) continue;
    if(rx[i]/k==m){
      ans[i]=lvec[lx[i]-l*k][k+rx[i]%k]; continue;
    }
    if(lx[i]/k==m){
      ans[i]=rvec[rx[i]-m*k][lx[i]%k]; continue;
    }
    ans[i]=1e10;
    rep(j, 0, k-1){
      ans[i]=min(ans[i], lvec[lx[i]-l*k][k+j]+rvec[rx[i]-m*k][j]);
    }
  }

  rep(i, l*k, m*k+k-1){
    rep(j, 0, k-1){
      vec[i-l*k][j]=lvec[i-l*k][j];
    }
  }
  rep(i, m*k, r*k+k-1){
    rep(j, k, 2*k-1){
      vec[i-l*k][j]=rvec[i-m*k][j];
    }
  }

  rep(i, (m+1)*k, r*k+k-1){
    rep(j, 0, k-1){
      vec[i-l*k][j]=1e10; 
      trav(p, radj[i]) vec[i-l*k][j]=min(vec[i-l*k][j], vec[p.f-l*k][j]+p.s);
    }
  }

  for(int i=m*k-1; i>=l*k; i--){
    rep(j, 0, k-1){
      vec[i-l*k][j+k]=1e10;
      trav(p, adj[i]) vec[i-l*k][j+k]=min(vec[i-l*k][j+k], vec[p.f-l*k][j+k]+p.s);
    }
  }
  return vec;
}

int main(){
  cin.tie(0)->sync_with_stdio(0);
  // freopen("input.txt", "r", stdin);
  // freopen("output.txt", "w", stdout);

  cin >> k >> n >> m >> q;
  rep(i, 1, m){
    int a, b, t; cin >> a >> b >> t;
    adj[a].pb({b, t});
    radj[b].pb({a, t});
    edge[{a, b}]=edge[{b, a}]=t;
  }

  vi qu;
  rep(i, 1, q){
    cin >> lx[i] >> rx[i];
    qu.pb(i);
  }
  calc(0, (n-1)/k, qu);

  rep(i, 1, q) cout << (ans[i]==1e10?-1:(lx[i]/k==rx[i]/k?-1:ans[i])) << nl;
}

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 172 ms 20496 KB Output is correct
2 Correct 2 ms 2636 KB Output is correct
3 Correct 2 ms 2636 KB Output is correct
4 Correct 2 ms 2636 KB Output is correct
5 Correct 4 ms 3020 KB Output is correct
6 Correct 4 ms 3020 KB Output is correct
7 Correct 4 ms 3020 KB Output is correct
8 Correct 180 ms 20504 KB Output is correct
9 Correct 223 ms 20148 KB Output is correct
10 Correct 93 ms 14248 KB Output is correct

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 303 ms 28716 KB Output is correct
2 Correct 2 ms 2636 KB Output is correct
3 Correct 2 ms 2636 KB Output is correct
4 Correct 2 ms 2688 KB Output is correct
5 Correct 2 ms 2636 KB Output is correct
6 Incorrect 2 ms 2636 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #3
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2636 KB Output is correct
2 Correct 2 ms 2636 KB Output is correct
3 Correct 2 ms 2636 KB Output is correct
4 Correct 2 ms 2636 KB Output is correct
5 Incorrect 2 ms 2636 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #4
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2636 KB Output is correct
2 Correct 2 ms 2636 KB Output is correct
3 Correct 2 ms 2636 KB Output is correct
4 Correct 2 ms 2636 KB Output is correct
5 Incorrect 2 ms 2636 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #5
0 / 44.0

# Verdict Execution time Memory Grader output
1 Correct 172 ms 20496 KB Output is correct
2 Correct 2 ms 2636 KB Output is correct
3 Correct 2 ms 2636 KB Output is correct
4 Correct 2 ms 2636 KB Output is correct
5 Correct 4 ms 3020 KB Output is correct
6 Correct 4 ms 3020 KB Output is correct
7 Correct 4 ms 3020 KB Output is correct
8 Correct 180 ms 20504 KB Output is correct
9 Correct 223 ms 20148 KB Output is correct
10 Correct 93 ms 14248 KB Output is correct
11 Correct 303 ms 28716 KB Output is correct
12 Correct 2 ms 2636 KB Output is correct
13 Correct 2 ms 2636 KB Output is correct
14 Correct 2 ms 2688 KB Output is correct
15 Correct 2 ms 2636 KB Output is correct
16 Incorrect 2 ms 2636 KB Output isn't correct
17 Halted 0 ms 0 KB -