oj.uz

답안 #493976

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
493976 2021-12-13T14:23:16 Z blue 별자리 3 (JOI20_constellation3) C++17
35 / 100
 1500 ms 248480 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 = 16;
const int lgN = 16;
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 50 ms 103736 KB Output is correct
2 Correct 53 ms 103772 KB Output is correct
3 Correct 51 ms 103760 KB Output is correct
4 Correct 54 ms 103792 KB Output is correct
5 Correct 52 ms 103748 KB Output is correct
6 Correct 50 ms 103872 KB Output is correct
7 Correct 51 ms 103752 KB Output is correct
8 Correct 49 ms 103748 KB Output is correct
9 Correct 48 ms 103712 KB Output is correct
10 Correct 49 ms 103788 KB Output is correct
11 Correct 49 ms 103756 KB Output is correct
12 Correct 54 ms 103872 KB Output is correct
13 Correct 50 ms 103752 KB Output is correct
14 Correct 49 ms 103848 KB Output is correct
15 Correct 48 ms 103748 KB Output is correct
16 Correct 48 ms 103828 KB Output is correct
17 Correct 49 ms 103748 KB Output is correct
18 Correct 48 ms 103748 KB Output is correct
19 Correct 49 ms 103780 KB Output is correct
20 Correct 53 ms 103712 KB Output is correct
21 Correct 55 ms 103832 KB Output is correct
22 Correct 47 ms 103784 KB Output is correct

Subtask #2
21.0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Correct 50 ms 103736 KB Output is correct
2 Correct 53 ms 103772 KB Output is correct
3 Correct 51 ms 103760 KB Output is correct
4 Correct 54 ms 103792 KB Output is correct
5 Correct 52 ms 103748 KB Output is correct
6 Correct 50 ms 103872 KB Output is correct
7 Correct 51 ms 103752 KB Output is correct
8 Correct 49 ms 103748 KB Output is correct
9 Correct 48 ms 103712 KB Output is correct
10 Correct 49 ms 103788 KB Output is correct
11 Correct 49 ms 103756 KB Output is correct
12 Correct 54 ms 103872 KB Output is correct
13 Correct 50 ms 103752 KB Output is correct
14 Correct 49 ms 103848 KB Output is correct
15 Correct 48 ms 103748 KB Output is correct
16 Correct 48 ms 103828 KB Output is correct
17 Correct 49 ms 103748 KB Output is correct
18 Correct 48 ms 103748 KB Output is correct
19 Correct 49 ms 103780 KB Output is correct
20 Correct 53 ms 103712 KB Output is correct
21 Correct 55 ms 103832 KB Output is correct
22 Correct 47 ms 103784 KB Output is correct
23 Correct 50 ms 104560 KB Output is correct
24 Correct 54 ms 104516 KB Output is correct
25 Correct 54 ms 104524 KB Output is correct
26 Correct 55 ms 104484 KB Output is correct
27 Correct 53 ms 104500 KB Output is correct
28 Correct 62 ms 104516 KB Output is correct
29 Correct 54 ms 104516 KB Output is correct
30 Correct 54 ms 104512 KB Output is correct
31 Correct 53 ms 104544 KB Output is correct
32 Correct 54 ms 105052 KB Output is correct
33 Correct 54 ms 105036 KB Output is correct
34 Correct 52 ms 105092 KB Output is correct
35 Correct 58 ms 105024 KB Output is correct
36 Correct 54 ms 105068 KB Output is correct
37 Correct 55 ms 105092 KB Output is correct
38 Correct 63 ms 105060 KB Output is correct
39 Correct 54 ms 104744 KB Output is correct
40 Correct 56 ms 105124 KB Output is correct
41 Correct 55 ms 104776 KB Output is correct
42 Correct 58 ms 104720 KB Output is correct
43 Correct 54 ms 105136 KB Output is correct
44 Correct 54 ms 104644 KB Output is correct

Subtask #3
0 / 65.0

# 결과 실행 시간 메모리 Grader output
1 Correct 50 ms 103736 KB Output is correct
2 Correct 53 ms 103772 KB Output is correct
3 Correct 51 ms 103760 KB Output is correct
4 Correct 54 ms 103792 KB Output is correct
5 Correct 52 ms 103748 KB Output is correct
6 Correct 50 ms 103872 KB Output is correct
7 Correct 51 ms 103752 KB Output is correct
8 Correct 49 ms 103748 KB Output is correct
9 Correct 48 ms 103712 KB Output is correct
10 Correct 49 ms 103788 KB Output is correct
11 Correct 49 ms 103756 KB Output is correct
12 Correct 54 ms 103872 KB Output is correct
13 Correct 50 ms 103752 KB Output is correct
14 Correct 49 ms 103848 KB Output is correct
15 Correct 48 ms 103748 KB Output is correct
16 Correct 48 ms 103828 KB Output is correct
17 Correct 49 ms 103748 KB Output is correct
18 Correct 48 ms 103748 KB Output is correct
19 Correct 49 ms 103780 KB Output is correct
20 Correct 53 ms 103712 KB Output is correct
21 Correct 55 ms 103832 KB Output is correct
22 Correct 47 ms 103784 KB Output is correct
23 Correct 50 ms 104560 KB Output is correct
24 Correct 54 ms 104516 KB Output is correct
25 Correct 54 ms 104524 KB Output is correct
26 Correct 55 ms 104484 KB Output is correct
27 Correct 53 ms 104500 KB Output is correct
28 Correct 62 ms 104516 KB Output is correct
29 Correct 54 ms 104516 KB Output is correct
30 Correct 54 ms 104512 KB Output is correct
31 Correct 53 ms 104544 KB Output is correct
32 Correct 54 ms 105052 KB Output is correct
33 Correct 54 ms 105036 KB Output is correct
34 Correct 52 ms 105092 KB Output is correct
35 Correct 58 ms 105024 KB Output is correct
36 Correct 54 ms 105068 KB Output is correct
37 Correct 55 ms 105092 KB Output is correct
38 Correct 63 ms 105060 KB Output is correct
39 Correct 54 ms 104744 KB Output is correct
40 Correct 56 ms 105124 KB Output is correct
41 Correct 55 ms 104776 KB Output is correct
42 Correct 58 ms 104720 KB Output is correct
43 Correct 54 ms 105136 KB Output is correct
44 Correct 54 ms 104644 KB Output is correct
45 Execution timed out 1604 ms 248480 KB Time limit exceeded
46 Halted 0 ms 0 KB -