답안 #490287

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
490287	2021-11-26T19:03:44 Z	JerryLiu06	Pipes (BOI13_pipes)	C++17	67.5926 / 100	57 ms	10464 KB

pipes

// https://oj.uz/problem/view/BOI13_pipes
 
#include <bits/stdc++.h>
 
using namespace std;
 
using ll = long long;
using ld = long double;
using db = double;
using str = string;
 
using pi = pair<int, int>;
using pl = pair<ll, ll>;
using pd = pair<db, db>;
 
using vi = vector<int>;
using vb = vector<bool>;
using vl = vector<ll>;
using vd = vector<db>;
using vs = vector<str>;
using vpi = vector<pi>;
using vpl = vector<pl>;
using vpd = vector<pd>;
 
#define FASTIO ios_base::sync_with_stdio(false); cin.tie(0);
#define FASTIOF ios_base::sync_with_stdio(false); fin.tie(0);
 
#define mp make_pair
#define f first
#define s second
 
#define sz(x) (int)(x).size()
#define bg(x) begin(x)
#define all(x) bg(x), end(x)
#define sor(x) sort(all(x))
#define rsz resize
#define ins insert 
#define ft front()
#define bk back()
#define pb push_back
#define pf push_front
 
#define lb lower_bound
#define ub upper_bound
 
#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define F0R(i, a) FOR(i, 0, a)
#define ROF(i, a, b) for (int i = (b) - 1; i >= (a); i--)
#define R0F(i, a) ROF(i, 0, a)
#define EACH(a, x) for (auto& a : x)
 
ll cdiv(ll a, ll b) { return a / b + ((a ^ b) > 0 && a % b); }
ll fdiv(ll a, ll b) { return a / b - ((a ^ b) < 0 && a % b); }
 
template<class T> bool ckmin(T& a, const T& b) { return b < a ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }
 
template<class T> void remDup(vector<T>& v) { sor(v); v.erase(unique(all(v)), v.end()); }
 
const int MOD = 1e9 + 7;
const int MX = 1e5 + 10;
const ll INF = 1e18;

int N, M; ll C[MX]; vpi adj[MX]; bool inCyc[MX]; int inDeg[MX]; ll ans[MX];

int main() {
    FASTIO;

    cin >> N >> M;

    if (M > N) {
        return cout << "0", 0;
    }
    FOR(i, 1, N + 1) {
        cin >> C[i];
    }
    FOR(i, 1, M + 1) {
        int A, B; cin >> A >> B;

        adj[A].pb({B, i});
        adj[B].pb({A, i});

        inDeg[A]++;
        inDeg[B]++;
    }
    FOR(i, 1, N + 1) inCyc[i] = true;

    queue<int> Q;

    FOR(i, 1, N + 1) {
        if (inDeg[i] == 1) {
            Q.push(i);
        }
    }
    while (!Q.empty()) {
        int cur = Q.front(); Q.pop();

        inCyc[cur] = false;
        
        EACH(Y, adj[cur]) {
            if (!inCyc[Y.f]) continue;

            ans[Y.s] = C[cur];

            inDeg[Y.f]--;
            C[Y.f] -= ans[Y.s];

            if (inDeg[Y.f] == 1) {
                Q.push(Y.f);
            }
        }
    }
   // cout << ans[11] << "HI " << "\n";
    if (M == N - 1) {
        FOR(i, 1, M + 1) {
            cout << 2 * ans[i] << "\n";
        }
        return 0;
    }
    vi cyc, edges; int curNode = -1;

    FOR(i, 1, N + 1) {
        if (inCyc[i]) {
            curNode = i; 
            edges.pb(adj[i][0].s);
            break;
        }
    }
    while (inCyc[curNode]) {
        inCyc[curNode] = false;

        cyc.pb(curNode);

        EACH(Y, adj[curNode]) {
            if (Y.s != edges.bk) {
                curNode = Y.f;
                edges.pb(Y.s);
                break;
            }
        }
    }
    edges.pop_back();

    N = sz(cyc);
    
    if (N % 2 == 0) {
        return cout << "0", 0;
    }
    ll sum = 0;
    
    EACH(i, cyc) {
        sum += C[i];
    }
    sum /= 2;
    
    vpi newCyc; int ind = 0;

    while (sz(newCyc) < N) {
        newCyc.pb({cyc[ind], ind});

        ind = (ind + 2) % N;
    }
    F0R(i, N) {
        newCyc.pb(newCyc[i]);
    }
    vl pref(sz(newCyc) + 1, 0);

    FOR(i, 1, sz(newCyc) + 1) {
        pref[i] = pref[i - 1] + C[newCyc[i - 1].f];
    }
    int numForward = (N - 1) / 2;

    F0R(i, N) {
        int curEdge = edges[(newCyc[i].s + N - 1) % N];
        
        ans[curEdge] = sum - (pref[i + numForward] - pref[i]);
    }
    FOR(i, 1, M + 1) {
        cout << 2 * ans[i] << "\n";
    }
}

Subtask #1

30.0 / 30.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	2636 KB	Output is correct
2	Correct	1 ms	2636 KB	Output is correct
3	Correct	2 ms	2636 KB	Output is correct
4	Correct	49 ms	9024 KB	Output is correct
5	Correct	1 ms	2636 KB	Output is correct
6	Correct	2 ms	2636 KB	Output is correct
7	Correct	2 ms	2636 KB	Output is correct
8	Correct	2 ms	2636 KB	Output is correct
9	Correct	2 ms	2636 KB	Output is correct
10	Correct	2 ms	2636 KB	Output is correct
11	Correct	2 ms	2636 KB	Output is correct
12	Correct	2 ms	2636 KB	Output is correct
13	Correct	39 ms	7784 KB	Output is correct
14	Correct	48 ms	8668 KB	Output is correct
15	Correct	51 ms	9120 KB	Output is correct
16	Correct	46 ms	8156 KB	Output is correct
17	Correct	48 ms	9028 KB	Output is correct
18	Correct	48 ms	9100 KB	Output is correct
19	Correct	48 ms	8340 KB	Output is correct
20	Correct	1 ms	2636 KB	Output is correct
21	Correct	2 ms	2636 KB	Output is correct
22	Correct	52 ms	9056 KB	Output is correct
23	Correct	40 ms	7692 KB	Output is correct
24	Correct	50 ms	9060 KB	Output is correct
25	Correct	39 ms	8012 KB	Output is correct

Subtask #2

37.5925925926 / 70.0

#	결과	실행 시간	메모리	Grader output
1	Incorrect	1 ms	2636 KB	Output isn't correct
2	Incorrect	1 ms	2636 KB	Output isn't correct
3	Incorrect	44 ms	8324 KB	Output isn't correct
4	Correct	1 ms	2636 KB	Output is correct
5	Correct	1 ms	2636 KB	Output is correct
6	Correct	1 ms	2636 KB	Output is correct
7	Incorrect	2 ms	2636 KB	Output isn't correct
8	Incorrect	1 ms	2636 KB	Output isn't correct
9	Incorrect	1 ms	2636 KB	Output isn't correct
10	Correct	1 ms	2636 KB	Output is correct
11	Correct	1 ms	2636 KB	Output is correct
12	Correct	1 ms	2636 KB	Output is correct
13	Correct	1 ms	2636 KB	Output is correct
14	Incorrect	1 ms	2636 KB	Output isn't correct
15	Incorrect	2 ms	2636 KB	Output isn't correct
16	Incorrect	2 ms	2636 KB	Output isn't correct
17	Incorrect	2 ms	2636 KB	Output isn't correct
18	Correct	1 ms	2636 KB	Output is correct
19	Correct	1 ms	2636 KB	Output is correct
20	Correct	1 ms	2636 KB	Output is correct
21	Correct	1 ms	2648 KB	Output is correct
22	Incorrect	2 ms	2636 KB	Output isn't correct
23	Incorrect	31 ms	7184 KB	Output isn't correct
24	Incorrect	52 ms	10056 KB	Output isn't correct
25	Incorrect	42 ms	8304 KB	Output isn't correct
26	Correct	1 ms	2636 KB	Output is correct
27	Correct	1 ms	2636 KB	Output is correct
28	Correct	1 ms	2636 KB	Output is correct
29	Correct	1 ms	2636 KB	Output is correct
30	Incorrect	40 ms	7772 KB	Output isn't correct
31	Incorrect	41 ms	8196 KB	Output isn't correct
32	Incorrect	45 ms	8524 KB	Output isn't correct
33	Correct	40 ms	8464 KB	Output is correct
34	Correct	1 ms	2636 KB	Output is correct
35	Correct	1 ms	2636 KB	Output is correct
36	Correct	1 ms	2636 KB	Output is correct
37	Correct	1 ms	2636 KB	Output is correct
38	Incorrect	47 ms	8932 KB	Output isn't correct
39	Incorrect	48 ms	8956 KB	Output isn't correct
40	Incorrect	51 ms	10464 KB	Output isn't correct
41	Correct	35 ms	7876 KB	Output is correct
42	Correct	1 ms	2636 KB	Output is correct
43	Correct	1 ms	2636 KB	Output is correct
44	Correct	1 ms	2636 KB	Output is correct
45	Correct	1 ms	2636 KB	Output is correct
46	Incorrect	46 ms	8180 KB	Output isn't correct
47	Incorrect	57 ms	9816 KB	Output isn't correct
48	Incorrect	44 ms	8240 KB	Output isn't correct
49	Incorrect	45 ms	8556 KB	Output isn't correct
50	Correct	2 ms	2636 KB	Output is correct
51	Correct	1 ms	2636 KB	Output is correct
52	Correct	1 ms	2636 KB	Output is correct
53	Correct	1 ms	2636 KB	Output is correct
54	Incorrect	47 ms	8248 KB	Output isn't correct