oj.uz

답안 #493975

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
493975 2021-12-13T14:20:58 Z blue 별자리 3 (JOI20_constellation3) C++17
35 / 100
 1500 ms 246484 KB 
#include <iostream>
#include <vector>
#include <algorithm>
#include <set>
using namespace std;
 
const int maxN = 200'000;
const int maxM = 200'000;
const int lgM = 17;
const int lgN = 17;
const int INF = 1'000'000'000;
 
int N;
vector<int> A(1+maxN+1);
vector<int> star_list[1+maxN];
 
int M;
vector<int> X(1+maxM);
vector<int> Y(1+maxM);
vector<long long> C(1+maxM);
 
long long total_cost = 0;
 
vector<int> lowest_pow(100+maxN);
 
struct sparse_table
{
    int** mx;
 
    sparse_table()
    {
        // cerr << "creating sparse table\n";
        mx = new int*[1+N+1];
        for(int i = 0; i <= N+1; i++)
            mx[i] = new int[lgN];
 
        for(int i = 0; i <= N+1; i++)
            mx[i][0] = A[i];
 
        for(int e = 1; e < lgN; e++)
        {
            for(int i = 0; i <= N+1; i++)
            {
                if(i + (1 << e) - 1 > N+1)
                    continue;
 
                mx[i][e] = max(mx[i][e-1], mx[i + (1 << (e-1))][e-1]);
            }
        }
        // cerr << "sparse table built\n";
    }
 
    int rangemax(int l, int r)
    {
        // cerr << "range max " << l << ' ' << r << '\n';
        int p = lowest_pow[r-l+1];
        // cerr << "p = " << p << '\n';
        return max(mx[l][p], mx[r - (1 << p) + 1][p]);
    }
};
 
 
 
vector<int> left_high(1+maxM);
vector<int> right_high(1+maxM);
 
 
struct rectangle
{
    int L; //[L, R] x [H, N]
    int R;
    int H;
    int I;
};
 
bool operator < (rectangle A, rectangle B)
{
    if(A.L != B.L)
        return A.L < B.L;
    else if(A.R != B.R)
        return A.R > B.R;
    else if(A.H != B.H)
        return A.H > B.H;
    else
        return A.I < B.I;
}
 
vector<rectangle> rect(1+maxM);
vector<int> star_bottom(1+maxM);
 
vector<int> openings[1+maxN];
vector<int> closings[1+maxN];
 
 
 
int anc[1+maxM][lgM];
vector<int> desc[1+maxM][lgM];
vector<int> depth(1+maxM, 0);
 
long long anc_dp_sum[1+maxM][lgM]; //exclusive
vector<long long> dp(1+maxM, 0LL);
vector<long long> child_dp_sum(1+maxM, 0LL);
 
 
bool dbg_flag = 0;
 
 
 
 
void dfs1(int u)
{
    for(int v: desc[u][0])
    {
        depth[v] = depth[u] + 1;
        dfs1(v);
    }
}
 
int getAnc(int u, int d)
{
    for(int e = 0; e < lgM; e++)
    {
        if(d & (1 << e))
            u = anc[u][e];
    }
    return u;
}
 
long long chain_sum(int u, int d)
{
    int u1 = u;
    long long ans = 0;
    for(int e = 0; e < lgM; e++)
    {
        if(d & (1 << e))
        {
            ans += anc_dp_sum[u][e];
            u = anc[u][e];
        }
    }
    // cerr << "chain sum " << u1 << ' ' << d << " " << ans << '\n';
    return ans;
}
 
 
 
 
void binary_lift(int u, int e)
{
    anc_dp_sum[u][e] = anc_dp_sum[u][e-1] + anc_dp_sum[ anc[u][e-1] ][e-1];
 
    for(int v: desc[u][e])
        binary_lift(v, e+1);
}
 
void dfs2(int u)
{
    for(int v: desc[u][0])
    {
        dfs2(v);
        child_dp_sum[u] += dp[v];
    }
 
    for(int v: desc[u][0])
    {
        anc_dp_sum[v][0] = child_dp_sum[u] - dp[v];
        // cerr << "anc dp sum " << v << ' ' << 0 << " = " << anc_dp_sum[v][0] << '\n';
        for(int v2: desc[v][0])
            binary_lift(v2, 1);
    }
    if(star_bottom[u] == u)
    {
        dp[u] = child_dp_sum[u] + C[u];
    }
    else
    {
        int sb = star_bottom[u];
                dbg_flag = 1;
        long long new_dp = child_dp_sum[sb] + chain_sum(sb, depth[sb] - depth[u]) + C[u];
        // new_dp += child_dp_sum[u] - dp[ getAnc(sb, depth[sb] - depth[u] - 1) ];
 
        dbg_flag = 0;
 
 
        dp[u] = max(child_dp_sum[u],   new_dp);
 
    }
}
 
 
 
int main()
{
  	ios_base::sync_with_stdio(false);
    cin.tie(NULL);
  
    cin >> N;
    A[0] = N+1;
    for(int i = 1; i <= N; i++) cin >> A[i];
    A[N+1] = N+1;
 
    cin >> M;
    for(int j = 1; j <= M; j++)
    {
        cin >> X[j] >> Y[j] >> C[j];
        star_list[ X[j] ].push_back(j);
        total_cost += C[j];
    }
 
    lowest_pow[1] = 0;
    for(int i = 2; i < lowest_pow.size(); i++)
        lowest_pow[i] = 1 + lowest_pow[i/2];
 
    sparse_table S;
 
    for(int j = 1; j <= M; j++)
    {
        // cerr << "j = " << j << '\n';
        int lo, hi, mid;
        //closest building on left
        lo = 0;
        hi = X[j]-1;
        while(lo != hi)
        {
            mid = (lo+hi)/2+1;
            if(S.rangemax(mid, hi) >= Y[j])
                lo = mid;
            else
                hi = mid-1;
        }
        left_high[j] = lo;
 
        // cerr << "part 1 done\n";
 
 
        //closest building on right
        lo = X[j]+1;
        hi = N+1;
        while(lo != hi)
        {
            // cerr << lo << ' ' << hi << '\n';
            mid = (lo+hi)/2;
            if(S.rangemax(lo, mid) >= Y[j])
                hi = mid;
            else
                lo = mid+1;
        }
        right_high[j] = lo;
 
 
        rect[j] = rectangle{left_high[j] + 1, right_high[j] - 1, Y[j], j};
        openings[rect[j].L].push_back(j);
        closings[rect[j].R].push_back(j);
        // cerr << "done\n";
    }
    // cerr << "check\n";
 
 
    for(int i = 1; i <= N; i++)
    {
        // cerr << "i = " << i << '\n';
        sort(openings[i].begin(), openings[i].end(), [] (int o1, int o2)
        {
            return rect[o1] < rect[o2];
        });
 
        // for(int o: openings[i]) cerr << o << ' ';
        // cerr << '\n';
 
        sort(closings[i].begin(), closings[i].end(), [] (int c1, int c2)
        {
            return rect[c2] < rect[c1]; //  REVERSED!!!!!!
        });
 
        // for(int c: closings[i]) cerr << c << ' ';
        // cerr << '\n';
    }
 
    vector<int> ST(1, 0);
    anc[0][0] = 0;
    for(int i = 1; i <= N; i++)
    {
        for(int o: openings[i])
        {
            anc[o][0] = ST.back();
            desc[ anc[o][0] ][0].push_back(o);
            ST.push_back(o);
        }
 
        for(int j: star_list[i])
        {
            star_bottom[j] = ST.back();
        }
 
        for(int c: closings[i])
        {
            ST.pop_back();
        }
    }
 
    for(int e = 1; e < lgM; e++)
        for(int j = 0; j <= M; j++)
        {
            anc[j][e] = anc[ anc[j][e-1] ][e-1];
            desc[ anc[j][e] ][e].push_back(j);
        }
 
    for(int j = 1; j <= M; j++)
        if(anc[j][0] == 0)
        {
            depth[j] = 1;
            dfs1(j);
        }
 
    long long max_kept = 0;
 
 
    for(int j = 1; j <= M; j++)
    {
        if(anc[j][0] == 0)
        {
            dfs2(j);
            max_kept += dp[j];
        }
    }
 
    cout << total_cost - max_kept << '\n';
}

Compilation message

constellation3.cpp: In function 'long long int chain_sum(int, int)':
constellation3.cpp:131:9: warning: unused variable 'u1' [-Wunused-variable]
  131 |     int u1 = u;
      |         ^~
constellation3.cpp: In function 'int main()':
constellation3.cpp:211:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  211 |     for(int i = 2; i < lowest_pow.size(); i++)
      |                    ~~^~~~~~~~~~~~~~~~~~~
constellation3.cpp:295:17: warning: unused variable 'c' [-Wunused-variable]
  295 |         for(int c: closings[i])
      |                 ^

Subtask #1
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 52 ms 108444 KB Output is correct
2 Correct 52 ms 108488 KB Output is correct
3 Correct 62 ms 108456 KB Output is correct
4 Correct 50 ms 108460 KB Output is correct
5 Correct 50 ms 108488 KB Output is correct
6 Correct 49 ms 108412 KB Output is correct
7 Correct 50 ms 108412 KB Output is correct
8 Correct 50 ms 108516 KB Output is correct
9 Correct 56 ms 108444 KB Output is correct
10 Correct 56 ms 108532 KB Output is correct
11 Correct 52 ms 108552 KB Output is correct
12 Correct 54 ms 108576 KB Output is correct
13 Correct 55 ms 108484 KB Output is correct
14 Correct 53 ms 108508 KB Output is correct
15 Correct 53 ms 108460 KB Output is correct
16 Correct 51 ms 108588 KB Output is correct
17 Correct 52 ms 108492 KB Output is correct
18 Correct 50 ms 108496 KB Output is correct
19 Correct 50 ms 108508 KB Output is correct
20 Correct 51 ms 108456 KB Output is correct
21 Correct 48 ms 108572 KB Output is correct
22 Correct 49 ms 108520 KB Output is correct

Subtask #2
21.0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Correct 52 ms 108444 KB Output is correct
2 Correct 52 ms 108488 KB Output is correct
3 Correct 62 ms 108456 KB Output is correct
4 Correct 50 ms 108460 KB Output is correct
5 Correct 50 ms 108488 KB Output is correct
6 Correct 49 ms 108412 KB Output is correct
7 Correct 50 ms 108412 KB Output is correct
8 Correct 50 ms 108516 KB Output is correct
9 Correct 56 ms 108444 KB Output is correct
10 Correct 56 ms 108532 KB Output is correct
11 Correct 52 ms 108552 KB Output is correct
12 Correct 54 ms 108576 KB Output is correct
13 Correct 55 ms 108484 KB Output is correct
14 Correct 53 ms 108508 KB Output is correct
15 Correct 53 ms 108460 KB Output is correct
16 Correct 51 ms 108588 KB Output is correct
17 Correct 52 ms 108492 KB Output is correct
18 Correct 50 ms 108496 KB Output is correct
19 Correct 50 ms 108508 KB Output is correct
20 Correct 51 ms 108456 KB Output is correct
21 Correct 48 ms 108572 KB Output is correct
22 Correct 49 ms 108520 KB Output is correct
23 Correct 52 ms 109284 KB Output is correct
24 Correct 61 ms 109252 KB Output is correct
25 Correct 60 ms 109320 KB Output is correct
26 Correct 52 ms 109344 KB Output is correct
27 Correct 52 ms 109244 KB Output is correct
28 Correct 51 ms 109304 KB Output is correct
29 Correct 51 ms 109252 KB Output is correct
30 Correct 58 ms 109252 KB Output is correct
31 Correct 57 ms 109236 KB Output is correct
32 Correct 57 ms 109876 KB Output is correct
33 Correct 67 ms 109892 KB Output is correct
34 Correct 61 ms 109864 KB Output is correct
35 Correct 56 ms 109888 KB Output is correct
36 Correct 55 ms 109880 KB Output is correct
37 Correct 57 ms 109896 KB Output is correct
38 Correct 53 ms 109924 KB Output is correct
39 Correct 54 ms 109544 KB Output is correct
40 Correct 55 ms 109892 KB Output is correct
41 Correct 57 ms 109564 KB Output is correct
42 Correct 62 ms 109444 KB Output is correct
43 Correct 64 ms 109932 KB Output is correct
44 Correct 56 ms 109472 KB Output is correct

Subtask #3
0 / 65.0

# 결과 실행 시간 메모리 Grader output
1 Correct 52 ms 108444 KB Output is correct
2 Correct 52 ms 108488 KB Output is correct
3 Correct 62 ms 108456 KB Output is correct
4 Correct 50 ms 108460 KB Output is correct
5 Correct 50 ms 108488 KB Output is correct
6 Correct 49 ms 108412 KB Output is correct
7 Correct 50 ms 108412 KB Output is correct
8 Correct 50 ms 108516 KB Output is correct
9 Correct 56 ms 108444 KB Output is correct
10 Correct 56 ms 108532 KB Output is correct
11 Correct 52 ms 108552 KB Output is correct
12 Correct 54 ms 108576 KB Output is correct
13 Correct 55 ms 108484 KB Output is correct
14 Correct 53 ms 108508 KB Output is correct
15 Correct 53 ms 108460 KB Output is correct
16 Correct 51 ms 108588 KB Output is correct
17 Correct 52 ms 108492 KB Output is correct
18 Correct 50 ms 108496 KB Output is correct
19 Correct 50 ms 108508 KB Output is correct
20 Correct 51 ms 108456 KB Output is correct
21 Correct 48 ms 108572 KB Output is correct
22 Correct 49 ms 108520 KB Output is correct
23 Correct 52 ms 109284 KB Output is correct
24 Correct 61 ms 109252 KB Output is correct
25 Correct 60 ms 109320 KB Output is correct
26 Correct 52 ms 109344 KB Output is correct
27 Correct 52 ms 109244 KB Output is correct
28 Correct 51 ms 109304 KB Output is correct
29 Correct 51 ms 109252 KB Output is correct
30 Correct 58 ms 109252 KB Output is correct
31 Correct 57 ms 109236 KB Output is correct
32 Correct 57 ms 109876 KB Output is correct
33 Correct 67 ms 109892 KB Output is correct
34 Correct 61 ms 109864 KB Output is correct
35 Correct 56 ms 109888 KB Output is correct
36 Correct 55 ms 109880 KB Output is correct
37 Correct 57 ms 109896 KB Output is correct
38 Correct 53 ms 109924 KB Output is correct
39 Correct 54 ms 109544 KB Output is correct
40 Correct 55 ms 109892 KB Output is correct
41 Correct 57 ms 109564 KB Output is correct
42 Correct 62 ms 109444 KB Output is correct
43 Correct 64 ms 109932 KB Output is correct
44 Correct 56 ms 109472 KB Output is correct
45 Correct 1427 ms 205552 KB Output is correct
46 Correct 1274 ms 203128 KB Output is correct
47 Correct 1453 ms 206564 KB Output is correct
48 Correct 1367 ms 203172 KB Output is correct
49 Correct 1307 ms 203580 KB Output is correct
50 Correct 1264 ms 202488 KB Output is correct
51 Correct 1414 ms 204700 KB Output is correct
52 Correct 1399 ms 206076 KB Output is correct
53 Correct 1397 ms 203424 KB Output is correct
54 Execution timed out 1592 ms 246484 KB Time limit exceeded
55 Halted 0 ms 0 KB -