Submission #544392

#	Time	Username	Problem	Language	Result	Execution time	Memory
544392		huB1erTi2	Toll (BOI17_toll)	C++17	10 / 100	76 ms	15432 KiB

toll

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#include <iostream>
#include <vector>

using namespace std;

// #define DEBUG
#ifdef DEBUG
#define dassert(x) assert(x);
#define df(...) printf(__VA_ARGS__)
#else
#define dassert(x)
#define df(...)
#endif

#define x first
#define y second
#define mp make_pair
#define pb push_back
#define ir(x, a, b) ((a) <= (x) && (x) <= (b))
#define vec vector
#define sz(x) (ll)x.size()
#define foru(i, n) for (int i = 0; (i) < (n); ++(i))
#define all(x) (x).begin(), (x).end()

typedef int64_t ll;

int read() {
    int n = 0; bool b = 0; char c = getchar();
    for (; !ir(c, '0', '9'); c = getchar()) b = (c == '-');
    for (; ir(c, '0', '9'); c = getchar()) n = 10*n + (c-'0');
    if (b) return -n;
    return n;
}

int k;
struct mat {
    vec<vec<int>> t = vec<vec<int>>(k, vec<int>(k, 1e9));
    mat operator +(const mat& other) const {
        mat res;
        for (int i = 0; i < k; ++i) {
            for (int j = 0; j < k; ++j) {
                for (int x = 0; x < k; ++x) {
                    res.t[i][j] = min(res.t[i][j], t[i][x] + other.t[x][j]);
                }
            }
        }
        return res;
    }
};

int n, m, o, base;
mat zero;
vec<mat> st;

void init() {
    for (int i = base-1; i > 0; --i) {
        st[i] = st[2*i] + st[2*i+1];
    }
}

mat get(int l, int r) {
    mat lsum = zero, rsum = zero;
    for (l += base, r += base; l < r; l /= 2, r /= 2) {
        if (l & 1) lsum = rsum + st[l++];
        if (r & 1) rsum = st[--r] + rsum;
    }
    return lsum + rsum;
}

int main() {
    df("debug mode\n");
#ifndef DEBUG
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#endif
    cin >> k >> n >> m >> o;
    n /= k;
    
    zero = mat();
    foru (i, k) zero.t[i][i] = 0;
    
    base = 1;
    while (base <= n) base *= 2;
    st.resize(2*base);
    foru (i, m) {
        int a, b, t;
        cin >> a >> b >> t;
        st[base + a/k].t[a%k][b%k] = t;
    }
    init();
    foru (i, o) {
        int a, b;
        cin >> a >> b;
        int res = get(a/k, b/k).t[a%k][b%k];
        if (res == 1e9) cout << "-1\n";
        else cout << res << "\n";
    }
    return 0;
}

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