Submission #720286

#	Time	Username	Problem	Language	Result	Execution time	Memory
720286		bLIC	Toll (BOI17_toll)	C++17	100 / 100	428 ms	117808 KiB

toll

/**
 *  Author: Anil Byar
**/

#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>

// using namespace __gnu_pbds;
using namespace std;

// template<class T>
// using ordered_set = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;



#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sz(x) (int)(x).size()
#define uniq(v) v.erase(unique(all(v)), v.end())
#define ft first
#define sd second
#define pb push_back

// Source: https://codeforces.com/blog/entry/68809
// { start
void __print(int x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(long long x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '"' << x << '"';}
void __print(const string &x) {cerr << '"' << x << '"';}
void __print(bool x) {cerr << (x ? "true" : "false");}

template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifndef ONLINE_JUDGE
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define debug(x...)
#endif
// } end


typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<pii> vii;
typedef vector<ll> vl;
typedef vector<pll> vll;
typedef vector<vi> vvi;
typedef vector<vii> vvii;
typedef vector<vl> vvl;

#define dbg if(0)

const ll MOD = 1e9+7;
const ll MOD9 = 998244353;
const ll INFLL = 1e18+5;
const int INF = 1e9;

void printbit(int x, int len) {string s="\n";while(len--){s=((x%2)?'1':'0')+s;x/=2;} cout<<s;}
ll power(ll x, ll y, ll mod){if (y==0) return 1;ll ret = power(x, y/2, mod);ret *= ret;ret%=mod;if (y&1) ret *= x;return ret%mod;}
ll modinv(ll x, ll mod = MOD) {return power(x, mod-2, mod);}

template<class T>
istream& operator>>(istream&in, vector<T>&v){
    for (T& x:v) in>>x;
    return in;
}
template<class T>
ostream& operator<<(ostream&out, vector<T>&v){
    for (T& x:v) out<<x<<' ';
    cout<<'\n';
    return out;
}
// use ?: with brackets (?:)
// check for overflow
// think about dp
// Read the statement carefully

const int maxN = 1e5+5;;
const int maxK = 8001;

template<class T>
class Div_Con{
    vector<vector<T>> table;
    vector<T> a;
    T id;
    int n;
    public:
    void init(vector<T> _a, T _id){
        n = 1;while((1<<n)<(int)_a.size()) n++;
        id = _id;a = _a;a.resize(1<<n, id);
        table.resize(1<<n, vector<T>(n, id));
        build(0, (1<<n), n-1);
    }
    void build(int l, int r, int lvl){
        if (lvl<0) return;
        int mid = (l+r)/2;
        
        table[mid-1][lvl] = a[mid-1];
        table[mid][lvl] = a[mid];
        for (int i = mid-2;i>=l;i--) table[i][lvl] = comb(a[i], table[i+1][lvl]);
        for (int i = mid+1;i<r;i++) table[i][lvl] = comb(table[i-1][lvl], a[i]);

        build(l, mid, lvl-1);
        build(mid, r, lvl-1);
    }
    T comb(T x, T y) {return x+y;} // replace with any associative operation
    T query(int l, int r){
        if (l==r) return a[l];
        int lvl = 31 - __builtin_clz(l^r);
        assert(r>l);
        // debug(table[l][lvl]);
        return comb(table[l][lvl], table[r][lvl]);
    }
};

struct Node{
    vvl cost;
    int K;
    Node(){}
    Node(int k){
        cost.assign(k, vl(k, INFLL));
        K = k;
        for (int i = 0;i<K;i++){
            for (int j = 0;j<K;j++) cost[i][j] = INFLL;
        }
    }
    friend Node operator+(Node& a, Node& b){
        Node tmp(a.K);
        for (int i = 0;i<a.K;i++){
            for (int j = 0;j<a.K;j++){
                for (int l = 0;l<a.K;l++) tmp.cost[i][j] = min(tmp.cost[i][j], a.cost[i][l]+b.cost[l][j]);
            }
        }
        return tmp;
    }
};

void solve(){
    int k, n, m, o;
    cin>>k>>n>>m>>o;
    Div_Con<Node> divc;
    vector<Node> nodes(n/k+2, Node(k));
    for (int i = 0;i<m;i++){
        int a, b, t;cin>>a>>b>>t;
        assert(a/k<=n/k+1);
        assert(k);
        nodes[a/k].cost[a%k][b%k] = t;
    }
    divc.init(nodes, Node(k));
    // for (int i = 0;)
    while(o--){
        int l, r;
        cin>>l>>r;
        if (l/k>=r/k){
            cout<<-1<<'\n';
            continue;
        }
        ll ans = divc.query(l/k, r/k-1).cost[l%k][r%k];
        if (ans==INFLL) ans = -1;
        cout<<ans<<'\n';
    }
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);

// #ifndef ONLINE_JUDGE
//     freopen("input.in", "r", stdin);
//     freopen("output.out", "w", stdout);
//     freopen("debug.dbg", "w", stderr);
//     int tt = clock();
// #endif

    int t=1, i = 1;
    // cin>>t;
    while(t--){
        // cout<<"Case #"<<i++<<": ";
        solve();
        cout<<'\n';
    }
// #ifndef ONLINE_JUDGE
//     cerr << "TIME = " << (float)(clock() - tt)/CLOCKS_PER_SEC << endl;
//     tt = clock();
// #endif
}

Compilation message (stderr)

toll.cpp: In function 'int main()':
toll.cpp:192:14: warning: unused variable 'i' [-Wunused-variable]
  192 |     int t=1, i = 1;
      |              ^

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