Submission #1095219

#	Time	Username	Problem	Language	Result	Execution time	Memory
1095219		shidou26	Two Currencies (JOI23_currencies)	C++14	100 / 100	1097 ms	43372 KiB

currencies

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

#define endl '\n'
#define all(v) v.begin(), v.end()
#define filter(v) v.resize(unique(all(v)) - v.begin())

typedef long long ll;
typedef pair<int, int> ii;
typedef pair<ll, int> li;

const int MOD = 1e9 + 7;
inline ll add(ll x, ll y, ll mod = MOD) {return ((x % mod) + (y % mod)) % mod;}
inline ll sub(ll x, ll y, ll mod = MOD) {return ((x - y) % mod + mod) % mod;}
inline ll prod(ll x, ll y, ll mod = MOD) {return ((x % mod) * (y % mod)) % mod;}

const int N = 1e5 + 3;

struct query {
	int u, v; 
	ll gold, silver;
};

int n, m, q;
int eu[N], ev[N];
li stations[N];
query queries[N];
vector<int> adj[N];

int timer = 0;
int siz[N], pos[N], head[N], hev[N], h[N], ans[N], l[N], r[N], par[N];
ll st[N << 2], lzy[N << 2];
vector<int> indices[N];

struct heavy_light_decompostion {
	int n;
	vector<ll> bit;

	void init(int Size) {
		n = Size;
		bit.resize(Size + 3);
	}

	void update(int pos, ll value) {
		// cout << pos << " " << value << endl;
		for(; pos <= n; pos += pos & -pos) bit[pos] += value;
	}

	ll point(int pos) {
		ll ans = 0;
		for(; pos; pos -= pos & -pos) ans += bit[pos];
		return ans;
	}

	ll get(int l, int r) {
		return point(r) - point(l - 1);
	}

	ll path(int u, int v) {
	    ll ans = 0;
	    while(head[u] != head[v]) {
	        if(h[head[u]] < h[head[v]]) swap(u, v);
	        ans += get(pos[head[u]], pos[u]);
	        u = par[head[u]];
	    }
	    int l = pos[u], r = pos[v];
	    if(l > r) swap(l, r);
	    ans += get(l + 1, r);
	    return ans;
	}
};

void prepare() {

}

void input() {
	cin >> n >> m >> q;

	for(int i = 1; i < n; i++) {
		int u, v; cin >> u >> v;
		eu[i] = u;
		ev[i] = v;
		adj[u].push_back(i);
		adj[v].push_back(i);
	}

	for(int i = 1; i <= m; i++) {
		int id; ll fee; cin >> id >> fee;
		stations[i] = {fee, id};
	}

	for(int i = 1; i <= q; i++) {
		cin >> queries[i].u >> queries[i].v >> queries[i].gold >> queries[i].silver;
	}
}

void dfs(int u, int prev) {
    siz[u] = 1;
    for(int i = 0; i < (int)adj[u].size(); i++) {
        int id = adj[u][i], v = eu[id] + ev[id] - u;
        if(v != prev) {
            h[v] = h[u] + 1;
            par[v] = u;
            dfs(v, u);
            siz[u] += siz[v];
            if(siz[v] > siz[hev[u]]) hev[u] = v;
        }
    }
}

void decompose(int u, int trailing_head) {
    head[u] = trailing_head;
    pos[u] = ++timer;
    if(hev[u]) decompose(hev[u], trailing_head);
    for(int i = 0; i < (int)adj[u].size(); i++) {
        int id = adj[u][i], v = eu[id] + ev[id] - u;
        if(par[u] != v && hev[u] != v) decompose(v, v);
    }
}

void process() {
	sort(stations + 1, stations + 1 + m);

	dfs(1, -1);
	decompose(1, -1);

	for(int i = 1; i < n; i++) {
		if(h[eu[i]] > h[ev[i]]) swap(eu[i], ev[i]);
	}

	for(int i = 1; i <= q; i++) {
		l[i] = 0;
		r[i] = m;
	}

	while(true) {
		bool good = false;
		for(int i = 1; i <= q; i++) {
			if(l[i] <= r[i]) {
				good = true;
				indices[(l[i] + r[i]) >> 1].push_back(i);
				// cout << ((l[i] + r[i]) >> 1) << endl;
			}
		}

		if(!good) break;

		heavy_light_decompostion one, two; one.init(n); two.init(n);
		for(int i = 1; i <= m; i++) one.update(pos[ev[stations[i].second]], 1);
		for(int i = 0; i <= m; i++) {
			ll cost; int id; tie(cost, id) = stations[i];

			// cout << cost << " " << id << endl;

			if(i > 0) {
				one.update(pos[ev[id]], -1);
				two.update(pos[ev[id]], cost);
			}

			for(int index : indices[i]) {
				if(two.path(queries[index].u, queries[index].v) <= queries[index].silver) {
					// cout << two.path(queries[index].u, queries[index].v) << endl;
					ans[index] = one.path(queries[index].u, queries[index].v);
					// cout << queries[index].u << " " << queries[index].v << endl;
					// cout << ans[index] << endl;
					l[index] = i + 1;
				}else {
					r[index] = i - 1;
				}
			}
			indices[i].clear();
		}
	}

	for(int i = 1; i <= q; i++)
		cout << max(-1LL, queries[i].gold - ans[i]) << endl;
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    #define task "Date_A_Live"
    if(fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    
    prepare();
    
    int testcase = 1; // cin >> testcase;    
    for(int i = 1; i <= testcase; i++) {
        input();
        process();
    }

    cerr << "Saa, watashtachi no deito hajimemashou" << endl;

    return 0;
}

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*/

Compilation message (stderr)

currencies.cpp: In function 'int main()':
currencies.cpp:186:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  186 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
currencies.cpp:187:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  187 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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