Submission #568718

#	Time	Username	Problem	Language	Result	Execution time	Memory
568718		maomao90	Reconstruction Project (JOI22_reconstruction)	C++17	31 / 100	5065 ms	38348 KiB

reconstruction

// Hallelujah, praise the one who set me free
// Hallelujah, death has lost its grip on me
// You have broken every chain, There's salvation in your name
// Jesus Christ, my living hope
#include <bits/stdc++.h> 
using namespace std;

template <class T>
inline bool mnto(T& a, T b) {return a > b ? a = b, 1 : 0;}
template <class T>
inline bool mxto(T& a, T b) {return a < b ? a = b, 1: 0;}
#define REP(i, s, e) for (int i = s; i < e; i++)
#define RREP(i, s, e) for (int i = s; i >= e; i--)
typedef long long ll;
typedef long double ld;
#define FI first
#define SE second
typedef pair<int, int> ii;
typedef pair<ll, ll> pll;
typedef tuple<int, int, int> iii;
#define ALL(_a) _a.begin(), _a.end()
#define SZ(_a) (int) _a.size()
#define pb push_back
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<ii> vii;
typedef vector<iii> viii;

#ifndef DEBUG
#define cerr if (0) cerr
#endif

const int INF = 1000000005;
const ll LINF = 1000000000000000005ll;
const int MAXM = 100005;
const int MAXN = 505;
const int MAXQ = 1000005;

int n, m;
iii edges[MAXM];
int q;
ii qry[MAXQ];
vii vw[MAXN];
int lft[MAXM], rht[MAXM];
ll ans[MAXQ];

int rp[MAXN], rnk[MAXN];
void init() {
    REP (i, 1, n + 1) {
        rnk[i] = 1;
        rp[i] = i;
    }
}
int findp(int i) {
    if (rp[i] == i) return i;
    return rp[i] = findp(rp[i]);
}
bool join(int a, int b) {
    int pa = findp(a), pb = findp(b);
    if (pa == pb) return 0;
    if (rnk[pa] < rnk[pb]) swap(pa, pb);
    if (rnk[pa] == rnk[pb]) rnk[pa]++;
    rp[pb] = pa;
    return 1;
}

bool isPos(int x, int id) {
    auto [ra, rb, rw] = edges[id];
    init();
    REP (i, 0, m) {
        if (i == id) {
            continue;
        }
        auto [a, b, w] = edges[i];
        if (ii{abs(w - x), i} < ii{abs(rw - x), id}) {
            join(a, b);
        }
    }
    return join(ra, rb);
}

int main() {
#ifndef DEBUG
    ios::sync_with_stdio(0), cin.tie(0);
#endif
    cin >> n >> m;
    REP (i, 0, m) {
        int a, b, w; cin >> a >> b >> w;
        edges[i] = {a, b, w};
    }
    cin >> q;
    REP (i, 0, q) {
        cin >> qry[i].FI;
        qry[i].SE = i;
    }
    viii ev;
    REP (i, 0, m) {
        auto [a, b, w] = edges[i];
        int lo = w - 1, hi = INF;
        while (lo < hi) {
            int mid = lo + hi + 1 >> 1;
            if (isPos(mid, i)) {
                lo = mid;
            } else {
                hi = mid - 1;
            }
        }
        rht[i] = lo + 1;
        lo = 0, hi = w + 1;
        while (lo < hi) {
            int mid = lo + hi >> 1;
            if (isPos(mid, i)) {
                hi = mid;
            } else {
                lo = mid + 1;
            }
        }
        lft[i] = hi;
        cerr << i << ": " << lft[i] << ' ' << rht[i] << '\n';
        ev.pb({lft[i], w, 1});
        ev.pb({w + 1, -2 * w, -2});
        ev.pb({rht[i], w, 1});
    }
    sort(ALL(ev));
    int j = 0;
    ll res = 0;
    int minus = 0;
    REP (i, 0, q) {
        auto [x, id] = qry[i];
        while (j < SZ(ev) && get<0>(ev[j]) <= x) {
            auto [a, b, c] = ev[j];
            res += b;
            minus += c;
            j++;
        }
        ans[id] = res - (ll) x * minus;
    }
    REP (i, 0, q) {
        cout << ans[i] << '\n';
    }
    return 0;
}

Compilation message (stderr)

reconstruction.cpp: In function 'int main()':
reconstruction.cpp:102:31: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  102 |             int mid = lo + hi + 1 >> 1;
      |                       ~~~~~~~~^~~
reconstruction.cpp:112:26: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  112 |             int mid = lo + hi >> 1;
      |                       ~~~^~~~

• Subtask 1: 3 / 3
• Subtask 2: 0 / 4
• Subtask 3: 0 / 7
• Subtask 4: 28 / 28
• Subtask 5: 0 / 35
• Subtask 6: 0 / 23