Submission #485632

#	Time	Username	Problem	Language	Result	Execution time	Memory
485632		macktvz	Toll (BOI17_toll)	C++17	0 / 100	8 ms	7540 KiB

toll

#include <bits/stdc++.h>
#include <cmath>
typedef long long ll;
using namespace std;
ll inf = 1e9+12;
const int N = 1e4+1;
vector<vector<vector<ll>>> L(N);
vector<vector<vector<ll>>> R(N);
vector<vector<pair<int,int>>> adj(N,vector<pair<int,int>>(0));
vector<vector<pair<int,int>>> radj(N,vector<pair<int,int>>(0));
ll ans[N];
int A[N];
int B[N];
int n,k;
void divi(int l, int r, vector<int> v) {
    if (!v.size()) return;
    if (l == r) {
        for(int i : v) ans[i] = 0;
    }
    int m = (l+r)/2;
    int mid = m;
    m/=k;
    for(int i = m+1; i < r/k+1; i++) {
        for(int j = 0; j < k; j++) {
            for(pair<int,int> x : radj[i*k+j]) {
                for(int f = 0; f < k; f++) {
                    R[i-m][f][j] = min(R[i-m][f][j],x.second+R[i-m-1][f][x.first%k]);
                }
            }
        }
    }
    for(int i = m-1; i > l/k-1; i--) {
        for(int j = 0; j < k; j++) {
            for(pair<int,int> x : adj[i*k+j]) {
                for(int f = 0; f < k; f++) {
                    L[m-i][f][j] = min(L[m-i][f][j],x.second+L[m-i-1][f][x.first%k]);
                }
            }
        }
    }
    vector<int> todo[2];
    for(int i : v) {
        int a = A[i],b=B[i];
        if (a <= mid && b > mid) {
            int ka = a/k;
            int kb = b/k;
            
            for(int j = 0; j < k; j++) {
                ans[i] = min(ans[i],L[m-ka][j][a%k]+R[kb-m][j][b%k]);
            }
            if (ans[i] >= inf) ans[i] = -1;
            continue;
        }
        todo[a > mid].push_back(i);
    }
    divi(l,mid,todo[0]); divi(mid+1,r,todo[1]);
    for(int i = m+1; i < r/k+1; i++) {
        for(int j = 0; j < k; j++) {
            for(int f = 0; f < k; f++) {
                R[i-m][f][j] = inf;
            }
        }
    }
    for(int i = m-1; i > l/k-1; i--) {
        for(int j = 0; j < k; j++) {
            for(int f = 0; f < k; f++) {
                L[m-i][f][j] = inf;
            }
        }
    }
}

int main() {
    int q; int m; cin >> k >> n >> m >> q;
    int a,b,t;
    for(int i = 0; i < n; i++) {
        ans[i] = inf;
        L[i] = vector<vector<ll>>(k,vector<ll>(k,inf));
        R[i] = vector<vector<ll>>(k,vector<ll>(k,inf));
    }
    for(int i = 0; i < m; i++) {
        cin >> a >> b >> t;
        adj[a].push_back({b,t});
        radj[b].push_back({a,t});
    }
    vector<int> qs;
    for(int i = 0; i < q; i++) {
        cin >> a >> b;
        A[i] = a; B[i] = b;
        qs.push_back(i);
    }
    for(int i = 0; i < k; i++) {
        L[0][i][i] = 0;
        R[0][i][i] = 0;
    }
    divi(0,n-1,qs);
    for(int i = 0; i < q; i++) {
        cout << ans[i] << endl;
    }
}

• Subtask 1: 0 / 7
• Subtask 2: 0 / 10
• Subtask 3: 0 / 8
• Subtask 4: 0 / 31
• Subtask 5: 0 / 44