Submission #772790

#	Time	Username	Problem	Language	Result	Execution time	Memory
772790		marvinthang	Two Currencies (JOI23_currencies)	C++17	100 / 100	514 ms	34188 KiB

currencies

/*************************************
*    author: marvinthang             *
*    created: 04.07.2023 17:42:26    *
*************************************/

#include <bits/stdc++.h>

using namespace std;

#define                  fi  first
#define                  se  second
#define                left  ___left
#define               right  ___right
#define                TIME  (1.0 * clock() / CLOCKS_PER_SEC)
#define             MASK(i)  (1LL << (i))
#define           BIT(x, i)  ((x) >> (i) & 1)
#define  __builtin_popcount  __builtin_popcountll
#define              ALL(v)  (v).begin(), (v).end()
#define           REP(i, n)  for (int i = 0, _n = (n); i < _n; ++i)
#define          REPD(i, n)  for (int i = (n); i--; )
#define        FOR(i, a, b)  for (int i = (a), _b = (b); i < _b; ++i) 
#define       FORD(i, b, a)  for (int i = (b), _a = (a); --i >= _a; ) 
#define       FORE(i, a, b)  for (int i = (a), _b = (b); i <= _b; ++i) 
#define      FORDE(i, b, a)  for (int i = (b), _a = (a); i >= _a; --i) 
#define        scan_op(...)  istream & operator >> (istream &in, __VA_ARGS__ &u)
#define       print_op(...)  ostream & operator << (ostream &out, const __VA_ARGS__ &u)
#ifdef LOCAL
    #include "debug.h"
#else
    #define file(name) if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
    #define DB(...) 23
    #define db(...) 23
    #define debug(...) 23
#endif

template <class U, class V> scan_op(pair <U, V>)  { return in >> u.first >> u.second; }
template <class T> scan_op(vector <T>)  { for (size_t i = 0; i < u.size(); ++i) in >> u[i]; return in; }
template <class U, class V> print_op(pair <U, V>)  { return out << '(' << u.first << ", " << u.second << ')'; }
template <size_t i, class T> ostream & print_tuple_utils(ostream &out, const T &tup) { if constexpr(i == tuple_size<T>::value) return out << ")";  else return print_tuple_utils<i + 1, T>(out << (i ? ", " : "(") << get<i>(tup), tup); }
template <class ...U> print_op(tuple<U...>) { return print_tuple_utils<0, tuple<U...>>(out, u); }
template <class Con, class = decltype(begin(declval<Con>()))> typename enable_if <!is_same<Con, string>::value, ostream&>::type operator << (ostream &out, const Con &con) { out << '{'; for (__typeof(con.begin()) it = con.begin(); it != con.end(); ++it) out << (it == con.begin() ? "" : ", ") << *it; return out << '}'; }
template <class A, class B> bool minimize(A &a, B b)  { if (a > b) { a = b; return true; } return false; }
template <class A, class B> bool maximize(A &a, B b)  { if (a < b) { a = b; return true; } return false; }

// index from 0
template <class T = int>
    struct Fenwick {

        T *bit = nullptr;
        int n;

        Fenwick(int _n = 0) {
            resize(_n);
        }

        void reset(void) {
            fill(bit, bit + 1 + n, T(0));
        }

        void resize(int _n) {
            if (bit != nullptr) delete[] bit;
            n = _n;
            bit = new T[n + 1];
            reset();
        }

        void update(int i, T val) {
            assert(0 <= i);
            ++i;
            for (; i <= n; i += i & -i) bit[i] += val;
        }

        T get(int i) {
            if (i < 0) return T(0);
            ++i;
            i = min(i, n);
            T res(0);
            for (; i > 0; i -= i & -i)
                res += bit[i];
            return res;
        }

        int upper_bound(T val) {
            int res = 0;
            for (int i = __lg(n); i >= 0; --i) {
                if ((res | MASK(i)) <= n && val >= bit[res | MASK(i)]) {
                    res |= MASK(i);
                    val -= bit[res];
                }
            }
            return res;
        }

        int lower_bound(T val) {
            int res = 0;
            for (int i = __lg(n); i >= 0; --i) {
                if ((res | MASK(i)) <= n && val > bit[res | MASK(i)]) {
                    res |= MASK(i);
                    val -= bit[res];
                }
            }
            return res;
        }

    };

// end of template

const int MAX = 1e5 + 5;
const int LOG = 20;

int N, M, Q, tin[MAX], tout[MAX];
vector <int> adj[MAX];
pair <int, int> edges[MAX];
vector <pair <int, int>> events;
int anc[MAX][LOG], depth[MAX], res[MAX];
int U[MAX], V[MAX], X[MAX], lca[MAX];
long long Y[MAX];

void init(void) {
	cin >> N >> M >> Q;
	REP(i, N - 1) {
		int u, v; cin >> u >> v;
		adj[u].push_back(v);
		adj[v].push_back(u);
		edges[i] = make_pair(u, v);
	}
}

void dfs(int u) {
	static int timeDfs = 0;
	tin[u] = timeDfs++;
	depth[u] = depth[anc[u][0]] + 1;
	FOR(i, 1, LOG) anc[u][i] = anc[anc[u][i - 1]][i - 1];
	for (int v: adj[u]) if (v != anc[u][0]) {
		anc[v][0] = u;
		dfs(v);
	}
	tout[u] = timeDfs;
}

int get_lca(int u, int v) {
	if (depth[u] < depth[v]) swap(u, v);
	REPD(i, LOG) if (depth[anc[u][i]] >= depth[v]) u = anc[u][i];
	if (u == v) return u;
	REPD(i, LOG) if (anc[u][i] != anc[v][i]) {
		u = anc[u][i];
		v = anc[v][i];
	}
	return anc[u][0];
}

Fenwick <int> cnt;
Fenwick <long long> sum;

void add(int p, int v) {
	int w = events[p].fi * v;
	p = events[p].se;
	cnt.update(tin[p], -v);
	cnt.update(tout[p], v);
	sum.update(tin[p], w);
	sum.update(tout[p], -w);
}

int calc(int i) {
	long long s = sum.get(tin[U[i]]) + sum.get(tin[V[i]]) - 2 * sum.get(tin[lca[i]]);
	if (s <= Y[i]) {
		int c = cnt.get(tin[U[i]]) + cnt.get(tin[V[i]]) - 2 * cnt.get(tin[lca[i]]);
		return max(-1, X[i] - c);
	}
	return -2;
}

void solve(int l, int r, const vector <int> &q) {
	if (q.empty()) return;
	if (r - l == 1) {
		for (int i: q) res[i] = calc(i);
		if (r == M) {
			add(l, 1);
			for (int i: q) maximize(res[i], calc(i));
			add(l, -1);
		}
		return;
	}
	int m = l + r >> 1;
	FOR(i, l, m) add(i, 1);
	vector <int> ql, qr;
	for (int i: q) (calc(i) == -2 ? ql : qr).push_back(i);
	solve(m, r, qr);
	FOR(i, l, m) add(i, -1);
	solve(l, m, ql);
}

void process(void) {
	dfs(1);
	sum.resize(N);
	cnt.resize(N);
	REP(i, M) {
		int p, c; cin >> p >> c; --p;
		p = anc[edges[p].fi][0] == edges[p].se ? edges[p].fi : edges[p].se;
		events.emplace_back(c, p);
		cnt.update(tin[p], +1);
		cnt.update(tout[p], -1);
	}
	sort(ALL(events));
	vector <int> q;
	REP(i, Q) {
		cin >> U[i] >> V[i] >> X[i] >> Y[i];
		lca[i] = get_lca(U[i], V[i]);
		q.push_back(i);
	}
	solve(0, M, q);
	REP(i, Q) cout << res[i] << '\n';
}

int main(void) {
	ios_base::sync_with_stdio(false); cin.tie(nullptr); // cout.tie(nullptr);
	file("currencies");
	init();
	process();
	cerr << "Time elapsed: " << TIME << " s.\n";
	return (0^0);
}

Compilation message (stderr)

currencies.cpp: In function 'void solve(int, int, const std::vector<int>&)':
currencies.cpp:185:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  185 |  int m = l + r >> 1;
      |          ~~^~~
currencies.cpp: In function 'int main()':
currencies.cpp:30:61: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |     #define file(name) if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
currencies.cpp:218:2: note: in expansion of macro 'file'
  218 |  file("currencies");
      |  ^~~~
currencies.cpp:30:94: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |     #define file(name) if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                                                       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
currencies.cpp:218:2: note: in expansion of macro 'file'
  218 |  file("currencies");
      |  ^~~~

• Subtask 1: 10 / 10
• Subtask 2: 28 / 28
• Subtask 3: 30 / 30
• Subtask 4: 32 / 32