Submission #789644

#	Time	Username	Problem	Language	Result	Execution time	Memory
789644		TB_	Toll (BOI17_toll)	C++17	10 / 100	306 ms	13620 KiB

toll

#include <bits/stdc++.h>
using namespace std;

// #undef _GLIBCXX_DEBUG                // disable run-time bound checking, etc
// #pragma GCC optimize("Ofast,inline") // Ofast = O3,fast-math,allow-store-data-races,no-protect-parens
// #pragma GCC optimize ("unroll-loops")

// #pragma GCC target("bmi,bmi2,lzcnt,popcnt")                      // bit manipulation
// #pragma GCC target("movbe")                                      // byte swap
// #pragma GCC target("aes,pclmul,rdrnd")                           // encryption
// #pragma GCC target("avx,avx2,f16c,fma,sse3,ssse3,sse4.1,sse4.2") // SIMD

// #include <bits/extc++.h>
// using namespace __gnu_pbds;
// template<class T>using ordered_set = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;
// template<class T>using ordered_multiset = tree<T, null_type, less_equal<T>, rb_tree_tag,tree_order_statistics_node_update>;

#define ll long long
#define INF (ll)1e9+7
#define fo(i, n) for(int i=0;i<n;i++)
#define deb(x) cout << #x << " = " << x << endl;
#define deb2(x, y) cout << #x << " = " << x << ", " << #y << " = " << y << endl
#define pb push_back
#define mp make_pair
#define F first
#define S second
#define LSOne(S) ((S) & (-S))
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
inline int readint(){ int v = 0; char c; while((c = getchar()) != EOF && c != ' ' && c != '\n'){ v *= 10; v += c - '0'; } return v; }
inline int readintsigned() { int v = 0; int sign = 1; char c = getchar(); if (c == '-') { sign = -1; } else { v += c - '0'; } while ((c = getchar()) != EOF && c != ' ' && c != '\n') { v *= 10; v += c - '0'; } return v * sign; }
inline string readstring() { string s; char c; while ((c = getchar()) != EOF && c != '\n' && c != ' ') { s.push_back(c); } return s; }
template <class result_t=std::chrono::milliseconds,class clock_t=std::chrono::steady_clock,class duration_t = std::chrono::milliseconds>
auto since(std::chrono::time_point<clock_t, duration_t> const& start){return std::chrono::duration_cast<result_t>(clock_t::now() - start);}
typedef pair<int, int> pii;
typedef pair<ll, ll> pl;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<pii> vpii;
typedef vector<pl> vpl;
typedef vector<vi> vvi;
typedef vector<vl> vvl;
typedef vector<vpii> vvpii;
typedef vector<vpl> vvpl;

vvpl adj(50001);

int k, n, m, o, from, to, t;

vvl memo(50001, vl(5, 1e16));
int seen[50001];

vl dfs(int u){
    if(u == n-5) return vl(5, 1e16);
    vl &res = memo[u];
    if(seen[u]) return res;
    seen[u] = 1;
    if((u/k)%((int)sqrt(n/k)) == ((int)sqrt(n/k)-1)) res = vl(5, 1e16);
    for(auto v : adj[u]){
        vl temp = dfs(v.F);
        if((u/k)%((int)sqrt(n/k)) == ((int)sqrt(n/k))-1){
            res[v.F%k] = v.S;
            continue;
        }
        fo(i, k) {
            res[i] = min(res[i], temp[i]+v.S);
        }
    }
    return res;
}

int main() {
    // cout << fixed << setprecision(20);
    // auto start = std::chrono::steady_clock::now(); // since(start).count()
    cin.tie(0)->sync_with_stdio(0);

    cin >> k >> n >> m >> o;
    n+=5;
    fo(i, m){
        cin >> from >> to >> t;
        adj[from].pb({to, t});
    }

    memset(seen, 0, sizeof(seen));
    fo(i, k) dfs(i);

    vl temp = memo[0];

    fo(x, o){
        // deb(x);
        cin >> from >> to;
        if(from == to) {
            cout << "0\n";
            continue;
        }else if(to < from){
            cout << "-1\n";
            continue;
        }
        
        vl currentToll(5, 1e16);
        currentToll[from%k] = 0;
        ll pos = from/k;
        if((from/k)/((int)sqrt(n/k))+1 < (to/k)/((int)sqrt(n/k))){
            ll toAdd = ((int)sqrt(n/k)-(pos%((int)sqrt(n/k))));
            fo(i, toAdd){
                vl newToll(5, 1e16);
                fo(j, k){
                    for(auto v : adj[pos*k+j]){
                        newToll[v.F%k] = min(newToll[v.F%k], currentToll[j]+v.S);
                    }
                }
                currentToll = newToll;
                pos++;
            }
            while((pos)/((int)sqrt(n/k))+1 < (to/k)/((int)sqrt(n/k))){
                vl newToll(5, 1e16);
                fo(i, k){
                    fo(j, k){
                        newToll[j] = min(newToll[j], currentToll[i]+memo[i+pos*k][j]);
                    }
                }
                currentToll = newToll;
                pos+=(int)sqrt(n/k);
            }
        } 
        while(pos < to/k){
            // deb(pos);
            vl newToll(5, 1e16);
            fo(j, k){
                for(auto v : adj[pos*k+j]){
                    newToll[v.F%k] = min(newToll[v.F%k], currentToll[j]+v.S);
                }
            }
            currentToll = newToll;
            pos++;
        }
        ll ans = currentToll[to%k];
        cout << ((ans>=((ll)1e16))?-1:ans) << "\n"; 
    }


    return 0;
}

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