oj.uz

Submission #1105953

# Submission time Handle Problem Language Result Execution time Memory
1105953 2024-10-28T14:54:41 Z Zero_OP Catfish Farm (IOI22_fish) C++17
100 / 100
 160 ms 44972 KB 
#include <bits/stdc++.h> //uh may be changing style make it better ?
#ifndef LOCAL
    #include <fish.h>
#endif // LOCAL

using namespace std;

#define sz(v) (int)v.size()
#define all(v) begin(v), end(v)

template<typename T> bool maximize(T& a, const T& b){
    if(a < b) return a = b, true;  return false;
}

long long max_weights(int sizeBoard, int nFishes, vector<int> column, vector<int> row, vector<int> weight){
    vector<vector<pair<int, int>>> fishes(sizeBoard);
    for(int i = 0; i < nFishes; ++i){
        fishes[column[i]].emplace_back(row[i], weight[i]);
    }

    vector<vector<long long>> pref(sizeBoard);
    vector<vector<long long>> up(sizeBoard), down(sizeBoard);
    for(int i = 0; i < sizeBoard; ++i){
        fishes[i].emplace_back(sizeBoard, 0);
        sort(all(fishes[i]));
        pref[i].resize(sz(fishes[i]));
        for(int j = 0; j < sz(fishes[i]); ++j){
            pref[i][j] = (j > 0 ? pref[i][j - 1] : 0) + fishes[i][j].second;
        }

        up[i].resize(sz(fishes[i]));
        down[i].resize(sz(fishes[i]));
    }

    auto prefixSum = [&](int c, int pos) -> long long{
        int l = 0, r = sz(fishes[c]) - 1;
        long long sum = 0;
        assert(!fishes[c].empty());
        while(l <= r){
            int mid = l + r >> 1;
            if(fishes[c][mid].first < pos) sum = pref[c][mid], l = mid + 1;
            else r = mid - 1;
        }

        return sum;
    };

    auto maxAll = [&](int col) -> long long{
        return max(*max_element(all(up[col])), *max_element(all(down[col])));
    };

    //let h[i] be the height of the chosen pier at column i
    for(int i = 1; i < sizeBoard; ++i){

        //calculate the down[i] (case h[i - 1] > h[i])
        long long mx = 0;
        for(int j = sz(fishes[i]) - 1, ptr = sz(fishes[i - 1]) - 1; j >= 0; --j){
            while(ptr >= 0 && fishes[i - 1][ptr].first >= fishes[i][j].first){
                maximize(mx, max(up[i - 1][ptr], down[i - 1][ptr]) + prefixSum(i, fishes[i - 1][ptr].first));
                --ptr;
            }

            maximize(down[i][j], mx - prefixSum(i, fishes[i][j].first));
        }

        //consider h[i - 1] < h[i] and case h[i - 2] > h[i - 1] < h[i]
        mx = (i > 1 ? maxAll(i - 2) : 0);
        for(int j = 0, ptr = 0; j < sz(fishes[i]); ++j){
            while(ptr < sz(fishes[i - 1]) && fishes[i - 1][ptr].first <= fishes[i][j].first){
                maximize(mx, up[i - 1][ptr] - prefixSum(i - 1, fishes[i - 1][ptr].first));
                ++ptr;
            }

            maximize(up[i][j], mx + prefixSum(i - 1, fishes[i][j].first));
        }
    }

    long long ans = 0;
    for(int i = 0; i < sizeBoard; ++i){
        for(int j = 0; j < sz(fishes[i]); ++j){
//            assert(j < sz(up[i]));
//            assert(j < sz(down[i]));
//            cout << "(" << i << ", " << fishes[i][j].first << ") = " << up[i][j] << ' ' << down[i][j] << '\n';
            maximize(ans, max(up[i][j], down[i][j]));
        }
    }

    return ans;
}

#ifdef LOCAL
    int main(){
        freopen("task.inp", "r", stdin);
        freopen("task.out", "w", stdout);

        int n, m;
        cin >> n >> m;
        vector<int> x(m), y(m), z(m);
        for(int i = 0; i < m; ++i) cin >> x[i] >> y[i] >> z[i];

        cout << max_weights(n, m, x, y, z) << '\n';

        return 0;
    }
#endif // LOCAL

Compilation message

fish.cpp: In function 'bool maximize(T&, const T&)':
fish.cpp:12:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   12 |     if(a < b) return a = b, true;  return false;
      |     ^~
fish.cpp:12:36: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   12 |     if(a < b) return a = b, true;  return false;
      |                                    ^~~~~~
fish.cpp: In lambda function:
fish.cpp:40:25: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   40 |             int mid = l + r >> 1;
      |                       ~~^~~

Subtask #1
3.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 50 ms 25844 KB Output is correct
2 Correct 70 ms 29576 KB Output is correct
3 Correct 24 ms 22352 KB Output is correct
4 Correct 24 ms 22352 KB Output is correct
5 Correct 136 ms 44972 KB Output is correct
6 Correct 120 ms 41108 KB Output is correct

Subtask #2
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 89 ms 31708 KB Output is correct
3 Correct 104 ms 36800 KB Output is correct
4 Correct 51 ms 25920 KB Output is correct
5 Correct 56 ms 29496 KB Output is correct
6 Correct 1 ms 336 KB Output is correct
7 Correct 1 ms 336 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 1 ms 344 KB Output is correct
10 Correct 32 ms 22100 KB Output is correct
11 Correct 28 ms 22352 KB Output is correct
12 Correct 51 ms 26048 KB Output is correct
13 Correct 63 ms 29372 KB Output is correct
14 Correct 50 ms 24412 KB Output is correct
15 Correct 59 ms 27172 KB Output is correct
16 Correct 62 ms 26048 KB Output is correct
17 Correct 61 ms 28604 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 38 ms 22308 KB Output is correct
2 Correct 27 ms 22352 KB Output is correct
3 Correct 42 ms 22304 KB Output is correct
4 Correct 38 ms 23624 KB Output is correct
5 Correct 58 ms 26192 KB Output is correct
6 Correct 54 ms 25672 KB Output is correct
7 Correct 67 ms 26132 KB Output is correct
8 Correct 76 ms 24648 KB Output is correct

Subtask #4
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 500 KB Output is correct
2 Correct 1 ms 504 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 336 KB Output is correct
6 Correct 1 ms 336 KB Output is correct
7 Correct 1 ms 336 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 2 ms 760 KB Output is correct
11 Correct 1 ms 336 KB Output is correct
12 Correct 1 ms 336 KB Output is correct
13 Correct 1 ms 336 KB Output is correct
14 Correct 1 ms 336 KB Output is correct

Subtask #5
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 500 KB Output is correct
2 Correct 1 ms 504 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 336 KB Output is correct
6 Correct 1 ms 336 KB Output is correct
7 Correct 1 ms 336 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 2 ms 760 KB Output is correct
11 Correct 1 ms 336 KB Output is correct
12 Correct 1 ms 336 KB Output is correct
13 Correct 1 ms 336 KB Output is correct
14 Correct 1 ms 336 KB Output is correct
15 Correct 1 ms 336 KB Output is correct
16 Correct 2 ms 592 KB Output is correct
17 Correct 19 ms 3664 KB Output is correct
18 Correct 19 ms 3152 KB Output is correct
19 Correct 17 ms 3664 KB Output is correct
20 Correct 17 ms 3664 KB Output is correct
21 Correct 18 ms 3780 KB Output is correct
22 Correct 28 ms 7364 KB Output is correct
23 Correct 4 ms 1104 KB Output is correct
24 Correct 11 ms 2640 KB Output is correct
25 Correct 1 ms 336 KB Output is correct
26 Correct 4 ms 1104 KB Output is correct

Subtask #6
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 500 KB Output is correct
2 Correct 1 ms 504 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 336 KB Output is correct
6 Correct 1 ms 336 KB Output is correct
7 Correct 1 ms 336 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 2 ms 760 KB Output is correct
11 Correct 1 ms 336 KB Output is correct
12 Correct 1 ms 336 KB Output is correct
13 Correct 1 ms 336 KB Output is correct
14 Correct 1 ms 336 KB Output is correct
15 Correct 1 ms 336 KB Output is correct
16 Correct 2 ms 592 KB Output is correct
17 Correct 19 ms 3664 KB Output is correct
18 Correct 19 ms 3152 KB Output is correct
19 Correct 17 ms 3664 KB Output is correct
20 Correct 17 ms 3664 KB Output is correct
21 Correct 18 ms 3780 KB Output is correct
22 Correct 28 ms 7364 KB Output is correct
23 Correct 4 ms 1104 KB Output is correct
24 Correct 11 ms 2640 KB Output is correct
25 Correct 1 ms 336 KB Output is correct
26 Correct 4 ms 1104 KB Output is correct
27 Correct 2 ms 1104 KB Output is correct
28 Correct 92 ms 17412 KB Output is correct
29 Correct 157 ms 24136 KB Output is correct
30 Correct 137 ms 23772 KB Output is correct
31 Correct 104 ms 23780 KB Output is correct
32 Correct 97 ms 24392 KB Output is correct
33 Correct 112 ms 23644 KB Output is correct
34 Correct 120 ms 23780 KB Output is correct
35 Correct 42 ms 9712 KB Output is correct
36 Correct 132 ms 24392 KB Output is correct

Subtask #7
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 38 ms 22308 KB Output is correct
2 Correct 27 ms 22352 KB Output is correct
3 Correct 42 ms 22304 KB Output is correct
4 Correct 38 ms 23624 KB Output is correct
5 Correct 58 ms 26192 KB Output is correct
6 Correct 54 ms 25672 KB Output is correct
7 Correct 67 ms 26132 KB Output is correct
8 Correct 76 ms 24648 KB Output is correct
9 Correct 56 ms 25928 KB Output is correct
10 Correct 46 ms 16176 KB Output is correct
11 Correct 83 ms 32072 KB Output is correct
12 Correct 1 ms 336 KB Output is correct
13 Correct 1 ms 336 KB Output is correct
14 Correct 1 ms 336 KB Output is correct
15 Correct 1 ms 336 KB Output is correct
16 Correct 1 ms 336 KB Output is correct
17 Correct 1 ms 336 KB Output is correct
18 Correct 29 ms 22348 KB Output is correct
19 Correct 29 ms 22352 KB Output is correct
20 Correct 26 ms 22520 KB Output is correct
21 Correct 28 ms 22364 KB Output is correct
22 Correct 61 ms 27208 KB Output is correct
23 Correct 81 ms 31948 KB Output is correct
24 Correct 91 ms 32544 KB Output is correct

Subtask #8
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 50 ms 25844 KB Output is correct
2 Correct 70 ms 29576 KB Output is correct
3 Correct 24 ms 22352 KB Output is correct
4 Correct 24 ms 22352 KB Output is correct
5 Correct 136 ms 44972 KB Output is correct
6 Correct 120 ms 41108 KB Output is correct
7 Correct 1 ms 336 KB Output is correct
8 Correct 89 ms 31708 KB Output is correct
9 Correct 104 ms 36800 KB Output is correct
10 Correct 51 ms 25920 KB Output is correct
11 Correct 56 ms 29496 KB Output is correct
12 Correct 1 ms 336 KB Output is correct
13 Correct 1 ms 336 KB Output is correct
14 Correct 1 ms 336 KB Output is correct
15 Correct 1 ms 344 KB Output is correct
16 Correct 32 ms 22100 KB Output is correct
17 Correct 28 ms 22352 KB Output is correct
18 Correct 51 ms 26048 KB Output is correct
19 Correct 63 ms 29372 KB Output is correct
20 Correct 50 ms 24412 KB Output is correct
21 Correct 59 ms 27172 KB Output is correct
22 Correct 62 ms 26048 KB Output is correct
23 Correct 61 ms 28604 KB Output is correct
24 Correct 38 ms 22308 KB Output is correct
25 Correct 27 ms 22352 KB Output is correct
26 Correct 42 ms 22304 KB Output is correct
27 Correct 38 ms 23624 KB Output is correct
28 Correct 58 ms 26192 KB Output is correct
29 Correct 54 ms 25672 KB Output is correct
30 Correct 67 ms 26132 KB Output is correct
31 Correct 76 ms 24648 KB Output is correct
32 Correct 1 ms 500 KB Output is correct
33 Correct 1 ms 504 KB Output is correct
34 Correct 1 ms 336 KB Output is correct
35 Correct 1 ms 336 KB Output is correct
36 Correct 1 ms 336 KB Output is correct
37 Correct 1 ms 336 KB Output is correct
38 Correct 1 ms 336 KB Output is correct
39 Correct 1 ms 336 KB Output is correct
40 Correct 1 ms 336 KB Output is correct
41 Correct 2 ms 760 KB Output is correct
42 Correct 1 ms 336 KB Output is correct
43 Correct 1 ms 336 KB Output is correct
44 Correct 1 ms 336 KB Output is correct
45 Correct 1 ms 336 KB Output is correct
46 Correct 1 ms 336 KB Output is correct
47 Correct 2 ms 592 KB Output is correct
48 Correct 19 ms 3664 KB Output is correct
49 Correct 19 ms 3152 KB Output is correct
50 Correct 17 ms 3664 KB Output is correct
51 Correct 17 ms 3664 KB Output is correct
52 Correct 18 ms 3780 KB Output is correct
53 Correct 28 ms 7364 KB Output is correct
54 Correct 4 ms 1104 KB Output is correct
55 Correct 11 ms 2640 KB Output is correct
56 Correct 1 ms 336 KB Output is correct
57 Correct 4 ms 1104 KB Output is correct
58 Correct 2 ms 1104 KB Output is correct
59 Correct 92 ms 17412 KB Output is correct
60 Correct 157 ms 24136 KB Output is correct
61 Correct 137 ms 23772 KB Output is correct
62 Correct 104 ms 23780 KB Output is correct
63 Correct 97 ms 24392 KB Output is correct
64 Correct 112 ms 23644 KB Output is correct
65 Correct 120 ms 23780 KB Output is correct
66 Correct 42 ms 9712 KB Output is correct
67 Correct 132 ms 24392 KB Output is correct
68 Correct 56 ms 25928 KB Output is correct
69 Correct 46 ms 16176 KB Output is correct
70 Correct 83 ms 32072 KB Output is correct
71 Correct 1 ms 336 KB Output is correct
72 Correct 1 ms 336 KB Output is correct
73 Correct 1 ms 336 KB Output is correct
74 Correct 1 ms 336 KB Output is correct
75 Correct 1 ms 336 KB Output is correct
76 Correct 1 ms 336 KB Output is correct
77 Correct 29 ms 22348 KB Output is correct
78 Correct 29 ms 22352 KB Output is correct
79 Correct 26 ms 22520 KB Output is correct
80 Correct 28 ms 22364 KB Output is correct
81 Correct 61 ms 27208 KB Output is correct
82 Correct 81 ms 31948 KB Output is correct
83 Correct 91 ms 32544 KB Output is correct
84 Correct 160 ms 43048 KB Output is correct
85 Correct 157 ms 44540 KB Output is correct
86 Correct 117 ms 39876 KB Output is correct
87 Correct 127 ms 41952 KB Output is correct
88 Correct 1 ms 508 KB Output is correct
89 Correct 123 ms 41892 KB Output is correct
90 Correct 137 ms 43080 KB Output is correct
91 Correct 116 ms 43864 KB Output is correct