CSES - Datatähti 2024 alku

Submission details
Task:	Uolevin kalansaalis
Sender:	Username*
Submission time:	2023-11-11 14:45:05 +0200
Language:	C++ (C++20)
Status:	READY
Result:	100

Feedback
group	verdict	score
#1	ACCEPTED	37
#2	ACCEPTED	63

Test results
test	verdict	time	group
#1	ACCEPTED	0.00 s	1, 2	details
#2	ACCEPTED	0.00 s	1, 2	details
#3	ACCEPTED	0.00 s	1, 2	details
#4	ACCEPTED	0.00 s	1, 2	details
#5	ACCEPTED	0.00 s	1, 2	details
#6	ACCEPTED	0.00 s	1, 2	details
#7	ACCEPTED	0.00 s	1, 2	details
#8	ACCEPTED	0.00 s	1, 2	details
#9	ACCEPTED	0.00 s	1, 2	details
#10	ACCEPTED	0.00 s	1, 2	details
#11	ACCEPTED	0.00 s	1, 2	details
#12	ACCEPTED	0.00 s	1, 2	details
#13	ACCEPTED	0.00 s	1, 2	details
#14	ACCEPTED	0.00 s	1, 2	details
#15	ACCEPTED	0.00 s	1, 2	details
#16	ACCEPTED	0.30 s	2	details
#17	ACCEPTED	0.30 s	2	details
#18	ACCEPTED	0.32 s	2	details
#19	ACCEPTED	0.28 s	2	details
#20	ACCEPTED	0.30 s	2	details
#21	ACCEPTED	0.30 s	2	details
#22	ACCEPTED	0.29 s	2	details
#23	ACCEPTED	0.29 s	2	details
#24	ACCEPTED	0.30 s	2	details

Code

#include <iostream>
#include <vector>
#include <algorithm>
#include <chrono>

using namespace std;

typedef long long int ll;

/*struct Cell {
    int row;
    int column;
    int value;
};*/


template<typename T>
struct sort_pair {
    bool operator()(const pair<int, T>& left, const pair<int, T>& right) {
        return left.first < right.first;
    }
};

template <
    class result_t = std::chrono::milliseconds,
    class clock_t = std::chrono::steady_clock,
    class duration_t = std::chrono::milliseconds
>
auto since(std::chrono::time_point<clock_t, duration_t> const& start)
{
    return std::chrono::duration_cast<result_t>(clock_t::now() - start);
}

int answer;
ll totalscore;
ll maxtri = -1;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    //freopen("input.txt", "r", stdin);

    //auto start = std::chrono::steady_clock::now();

    int n, m, k;
    cin >> n;
    cin >> m;
    cin >> k;

    if (k == 0 || (n == 1 && m == 1)) {
        cout << 0 << "\n";
        return 0;
    }

    vector<vector<int>> rows(n, vector<int>(m)); // vec of rows of cells in order
    vector<vector<int>> rowsums(n, vector<int>(m,0)); // vec of rows of the sum of all values before the current cell

    //auto start = std::chrono::steady_clock::now();
    for (int i = 0; i < k; ++i) {
        int row, column;
        char fish;
        cin >> row; row -= 1;
        cin >> column; column -= 1;
        cin >> fish;
        int value;
        if (fish == 'K') {
            value = 10;
        }
        else {
            value = -1;
        }
        totalscore -= value;

        rows[row][column] = value;
    }

    for (int i = 0; i < n; ++i) { 
        rowsums[i][0] = rows[i][0]; // set first value to the row's first value
        //cout << rowsums[i][0] << " ";
        for (int j = 1; j < m; ++j) {
            rowsums[i][j] = rowsums[i][j-1] + rows[i][j];
            //cout << rowsums[i][j] << " ";
        }
        //cout << endl;
    }

    //auto start2 = std::chrono::steady_clock::now();
    bool even = false;
    //int debugitercount = 0;
    for (int i = 1; i <= n; ++i) { // i, n height
        for (int j = 1; j <= m; ++j) { // j, m width
            //cout << "\n\nstarting " << i << " " << j;
            int maxT, minT;
            if (!even) { // odd <
                maxT = max(0, min({ i - 1, (j - 1) * 2, (m - j) * 2 + 1 })); // top, left, right
                minT = max(0, min({ n - i, (j - 1) * 2, (m - j) * 2 + 1 })); // bottom, left, right
            }
            else { // even >
                maxT = max(0, min({ i - 1, j * 2 - 1, (m - j) * 2 })); // top, left, right
                minT = max(0, min({ n - i, j * 2 - 1, (m - j) * 2 })); // bottom, left, right
            }
            //cout << minT << "/" << maxT << " ";

            minT = 0 - minT;

            int triSum = 0;

            int minX, maxX; minX = maxX = j - 1;

            //cout << "\n\n Up";
            for (int x = 0; x <= maxT; ++x) {
                if (minX<0 || maxX > m - 1) {
                    throw invalid_argument("lols");
                    cout << "DAS;";
                }
                int line = 0;

                int rrow = i - x - 1;
                /*vector<int>& row = rows[rrow];
                for (int y = minX; y <= maxX; ++y) {
                    line += row[y];
                }*/
                if (minX > 0) {
                    line = rowsums[rrow][maxX] - rowsums[rrow][minX - 1];
                }
                else {
                    line = rowsums[rrow][maxX];
                }
                //line = rowsums[rrow][maxX] - rowsums[rrow][minX-1];
                //cout << "\nline " << line << " at triangle part " << x << ", Realrow: " << rrow << " and min/max X: " << minX << "/" << maxX;
                triSum += line;
                if (triSum > maxtri) {
                    maxtri = triSum;
                    //cout << "\n !!!!!!!!!!!!!!!!!!!!!New maxtri " << maxtri << " at " << i << " " << j << " with height " << x << " and min/max " << minT << "/" << maxT;
                }

                if (!(rrow & 1)) { // is even
                    minX -= 1;
                }
                else {
                    maxX += 1;
                }
            }
            triSum = 0;
            minX = maxX = j - 1;
            for (int x = 0; x >= minT; --x) {
                int line = 0;

                int rrow = i - x - 1;
                /*vector<int>* __restrict row = &rows[rrow];
                for (int y = minX; y <= maxX; ++y) {
                    line += (*row)[y];
                }*/
                if (minX > 0) {
                    line = rowsums[rrow][maxX] - rowsums[rrow][minX - 1];
                }
                else {
                    line = rowsums[rrow][maxX];
                }
                //cout << "\nline " << line << " at triangle part " << x;
                triSum += line;
                if (triSum > maxtri) {
                    maxtri = triSum;
                    //cout << "\n dNew maxtri " << maxtri << " at " << i << " " << j;
                }

                if (!(rrow & 1)) { // is even
                    minX -= 1;
                }
                else {
                    maxX += 1;
                }
            }
        }
        //cout << "\n " << maxtri;
        even = !even;
    }

    //cout << debugitercount;

    //cout << "\n-- THE END --\nElapsed (ms)=" << since(start).count() << " , #2: " << since(start2).count() << endl;
    //cout << "\n\nRowsize: " << rows.size() << " \nTotalscore: " << totalscore << "\nMaxtri: " << maxtri << "\n\n";
    answer = totalscore + maxtri;
    cout << answer << endl;// << "\n";
}

Test details

Test 1

Group: 1, 2

Verdict: ACCEPTED

input
`5 6 13 1 1 K 5 1 K 2 2 H 4 2 H ...` view save

correct output
`-16` view save

user output
`-16` view save

Test 2

Group: 1, 2

Verdict: ACCEPTED

input
`5 6 7 1 5 K 4 6 K 2 4 H 2 5 H ...` view save

correct output
`0` view save

user output
`0` view save

Test 3

Group: 1, 2

Verdict: ACCEPTED

input
`5 6 7 5 5 K 2 6 K 2 4 H 2 5 H ...` view save

correct output
`0` view save

user output
`0` view save

Test 4

Group: 1, 2

Verdict: ACCEPTED

input
`10 10 51 3 3 H 6 3 H 9 5 H 5 10 H ...` view save

correct output
`50` view save

user output
`50` view save

Test 5

Group: 1, 2

Verdict: ACCEPTED

input
`10 10 52 3 5 H 3 1 H 9 6 H 2 8 H ...` view save

correct output
`40` view save

user output
`40` view save

Test 6

Group: 1, 2

Verdict: ACCEPTED

input
`10 10 60 6 10 H 2 8 H 5 8 H 8 10 H ...` view save

correct output
`-15` view save

user output
`-15` view save

Test 7

Group: 1, 2

Verdict: ACCEPTED

input
`10 10 60 4 7 H 7 4 H 4 10 H 3 6 H ...` view save

correct output
`60` view save

user output
`60` view save

Test 8

Group: 1, 2

Verdict: ACCEPTED

input
`10 10 40 9 9 H 5 10 H 5 6 H 4 9 H ...` view save

correct output
`2` view save

user output
`2` view save

Test 9

Group: 1, 2

Verdict: ACCEPTED

input
`1 1 0` view save

correct output
`0` view save

user output
`0` view save

Test 10

Group: 1, 2

Verdict: ACCEPTED

input
`1 1 1 1 1 K` view save

correct output
`0` view save

user output
`0` view save

Test 11

Group: 1, 2

Verdict: ACCEPTED

input
`1 1 1 1 1 H` view save

correct output
`0` view save

user output
`0` view save

Test 12

Group: 1, 2

Verdict: ACCEPTED

input
`10 5 32 10 3 H 4 4 H 3 3 H 5 4 H ...` view save

correct output
`20` view save

user output
`20` view save

Test 13

Group: 1, 2

Verdict: ACCEPTED

input
`5 10 32 5 9 H 2 4 H 2 9 H 2 5 H ...` view save

correct output
`28` view save

user output
`28` view save

Test 14

Group: 1, 2

Verdict: ACCEPTED

input
`10 10 100 2 9 H 5 4 H 5 9 K 6 1 K ...` view save

correct output
`-439` view save

user output
`-439` view save

Test 15

Group: 1, 2

Verdict: ACCEPTED

input
`10 10 100 8 9 H 5 10 H 5 4 H 3 9 H ...` view save

correct output
`88` view save

user output
`88` view save

Test 16

Group: 2

Verdict: ACCEPTED

input
`500 500 125000 125 261 K 84 78 K 11 200 K 481 246 K ...` view save

correct output
`-624270` view save

user output
`-624270` view save

Test 17

Group: 2

Verdict: ACCEPTED

input
`500 500 125100 16 61 H 37 62 H 459 125 H 318 476 H ...` view save

correct output
`124020` view save

user output
`124020` view save

Test 18

Group: 2

Verdict: ACCEPTED

input
`500 500 249999 22 214 H 356 145 H 341 29 H 393 262 H ...` view save

correct output
`249999` view save

user output
`249999` view save

Test 19

Group: 2

Verdict: ACCEPTED

input
`500 500 32000 30 81 H 315 34 H 78 112 H 367 166 H ...` view save

correct output
`10126` view save

user output
`10126` view save

Test 20

Group: 2

Verdict: ACCEPTED

input
`500 500 126745 164 390 H 126 331 H 164 126 H 55 92 H ...` view save

correct output
`-104692` view save

user output
`-104692` view save

Test 21

Group: 2

Verdict: ACCEPTED

input
`500 500 71200 106 191 H 314 189 H 482 485 H 344 401 H ...` view save

correct output
`-335853` view save

user output
`-335853` view save

Test 22

Group: 2

Verdict: ACCEPTED

input
`500 500 67772 421 277 H 428 470 H 169 142 H 256 345 H ...` view save

correct output
`-208567` view save

user output
`-208567` view save

Test 23

Group: 2

Verdict: ACCEPTED

input
`500 500 27434 366 481 H 38 22 H 126 107 H 135 169 H ...` view save

correct output
`-57100` view save

user output
`-57100` view save

Test 24

Group: 2

Verdict: ACCEPTED

input
`500 500 93982 183 13 H 463 230 H 264 351 H 399 290 H ...` view save

correct output
`-52800` view save

user output
`-52800` view save

Datatähti 2024 alku

Uolevin kalansaalis

Code

Test details

Test 1

Test 2

Test 3

Test 4

Test 5

Test 6

Test 7

Test 8

Test 9

Test 10

Test 11

Test 12

Test 13

Test 14

Test 15

Test 16

Test 17

Test 18

Test 19

Test 20

Test 21

Test 22

Test 23

Test 24

Tasks

Submissions (Username*)