oj.uz

답안 #493978

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
493978 2021-12-13T14:26:24 Z blue 별자리 3 (JOI20_constellation3) C++17
35 / 100
 1500 ms 235356 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 47 ms 108484 KB Output is correct
2 Correct 50 ms 108512 KB Output is correct
3 Correct 52 ms 108484 KB Output is correct
4 Correct 51 ms 108456 KB Output is correct
5 Correct 52 ms 108604 KB Output is correct
6 Correct 48 ms 108464 KB Output is correct
7 Correct 50 ms 108424 KB Output is correct
8 Correct 51 ms 108484 KB Output is correct
9 Correct 47 ms 108412 KB Output is correct
10 Correct 47 ms 108444 KB Output is correct
11 Correct 49 ms 108476 KB Output is correct
12 Correct 57 ms 108544 KB Output is correct
13 Correct 54 ms 108480 KB Output is correct
14 Correct 50 ms 108452 KB Output is correct
15 Correct 48 ms 108520 KB Output is correct
16 Correct 49 ms 108568 KB Output is correct
17 Correct 49 ms 108524 KB Output is correct
18 Correct 51 ms 108464 KB Output is correct
19 Correct 50 ms 108484 KB Output is correct
20 Correct 54 ms 108444 KB Output is correct
21 Correct 51 ms 108468 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 47 ms 108484 KB Output is correct
2 Correct 50 ms 108512 KB Output is correct
3 Correct 52 ms 108484 KB Output is correct
4 Correct 51 ms 108456 KB Output is correct
5 Correct 52 ms 108604 KB Output is correct
6 Correct 48 ms 108464 KB Output is correct
7 Correct 50 ms 108424 KB Output is correct
8 Correct 51 ms 108484 KB Output is correct
9 Correct 47 ms 108412 KB Output is correct
10 Correct 47 ms 108444 KB Output is correct
11 Correct 49 ms 108476 KB Output is correct
12 Correct 57 ms 108544 KB Output is correct
13 Correct 54 ms 108480 KB Output is correct
14 Correct 50 ms 108452 KB Output is correct
15 Correct 48 ms 108520 KB Output is correct
16 Correct 49 ms 108568 KB Output is correct
17 Correct 49 ms 108524 KB Output is correct
18 Correct 51 ms 108464 KB Output is correct
19 Correct 50 ms 108484 KB Output is correct
20 Correct 54 ms 108444 KB Output is correct
21 Correct 51 ms 108468 KB Output is correct
22 Correct 49 ms 108520 KB Output is correct
23 Correct 50 ms 109284 KB Output is correct
24 Correct 56 ms 109244 KB Output is correct
25 Correct 54 ms 109252 KB Output is correct
26 Correct 52 ms 109328 KB Output is correct
27 Correct 52 ms 109204 KB Output is correct
28 Correct 54 ms 109300 KB Output is correct
29 Correct 53 ms 109180 KB Output is correct
30 Correct 53 ms 109244 KB Output is correct
31 Correct 51 ms 109168 KB Output is correct
32 Correct 56 ms 109744 KB Output is correct
33 Correct 56 ms 109764 KB Output is correct
34 Correct 68 ms 109820 KB Output is correct
35 Correct 56 ms 109892 KB Output is correct
36 Correct 54 ms 109900 KB Output is correct
37 Correct 57 ms 109804 KB Output is correct
38 Correct 62 ms 109828 KB Output is correct
39 Correct 65 ms 109476 KB Output is correct
40 Correct 53 ms 109764 KB Output is correct
41 Correct 60 ms 109444 KB Output is correct
42 Correct 53 ms 109424 KB Output is correct
43 Correct 53 ms 109800 KB Output is correct
44 Correct 54 ms 109476 KB Output is correct

Subtask #3
0 / 65.0

# 결과 실행 시간 메모리 Grader output
1 Correct 47 ms 108484 KB Output is correct
2 Correct 50 ms 108512 KB Output is correct
3 Correct 52 ms 108484 KB Output is correct
4 Correct 51 ms 108456 KB Output is correct
5 Correct 52 ms 108604 KB Output is correct
6 Correct 48 ms 108464 KB Output is correct
7 Correct 50 ms 108424 KB Output is correct
8 Correct 51 ms 108484 KB Output is correct
9 Correct 47 ms 108412 KB Output is correct
10 Correct 47 ms 108444 KB Output is correct
11 Correct 49 ms 108476 KB Output is correct
12 Correct 57 ms 108544 KB Output is correct
13 Correct 54 ms 108480 KB Output is correct
14 Correct 50 ms 108452 KB Output is correct
15 Correct 48 ms 108520 KB Output is correct
16 Correct 49 ms 108568 KB Output is correct
17 Correct 49 ms 108524 KB Output is correct
18 Correct 51 ms 108464 KB Output is correct
19 Correct 50 ms 108484 KB Output is correct
20 Correct 54 ms 108444 KB Output is correct
21 Correct 51 ms 108468 KB Output is correct
22 Correct 49 ms 108520 KB Output is correct
23 Correct 50 ms 109284 KB Output is correct
24 Correct 56 ms 109244 KB Output is correct
25 Correct 54 ms 109252 KB Output is correct
26 Correct 52 ms 109328 KB Output is correct
27 Correct 52 ms 109204 KB Output is correct
28 Correct 54 ms 109300 KB Output is correct
29 Correct 53 ms 109180 KB Output is correct
30 Correct 53 ms 109244 KB Output is correct
31 Correct 51 ms 109168 KB Output is correct
32 Correct 56 ms 109744 KB Output is correct
33 Correct 56 ms 109764 KB Output is correct
34 Correct 68 ms 109820 KB Output is correct
35 Correct 56 ms 109892 KB Output is correct
36 Correct 54 ms 109900 KB Output is correct
37 Correct 57 ms 109804 KB Output is correct
38 Correct 62 ms 109828 KB Output is correct
39 Correct 65 ms 109476 KB Output is correct
40 Correct 53 ms 109764 KB Output is correct
41 Correct 60 ms 109444 KB Output is correct
42 Correct 53 ms 109424 KB Output is correct
43 Correct 53 ms 109800 KB Output is correct
44 Correct 54 ms 109476 KB Output is correct
45 Correct 1329 ms 200028 KB Output is correct
46 Correct 1267 ms 197872 KB Output is correct
47 Correct 1300 ms 200680 KB Output is correct
48 Correct 1300 ms 197852 KB Output is correct
49 Correct 1332 ms 198096 KB Output is correct
50 Correct 1305 ms 197152 KB Output is correct
51 Correct 1307 ms 199248 KB Output is correct
52 Correct 1371 ms 200380 KB Output is correct
53 Correct 1281 ms 197796 KB Output is correct
54 Execution timed out 1596 ms 235356 KB Time limit exceeded
55 Halted 0 ms 0 KB -