oj.uz

Submission #947155

# Submission time Handle Problem Language Result Execution time Memory
947155 2024-03-15T15:09:23 Z Nhoksocqt1 Catfish Farm (IOI22_fish) C++17
70 / 100
 886 ms 912568 KB 
#include<bits/stdc++.h>
using namespace std;

#define inf 0x3f3f3f3f
#define sz(x) int((x).size())
#define fi first
#define se second
typedef long long ll;
typedef pair<int, int> ii;

template<class X, class Y>
	inline bool maximize(X &x, const Y &y) {return (x < y ? x = y, 1 : 0);}
template<class X, class Y>
	inline bool minimize(X &x, const Y &y) {return (x > y ? x = y, 1 : 0);}

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int Random(int l, int r) {
    return uniform_int_distribution<int>(l, r)(rng);
}

const int MAXN = 100005;

struct Fish {
    int x, y, w;
} fish[3 * MAXN];

ll f[303][303][303], maxPre[3003][303], maxSuf[3003][303];
ll dp[3003][3003], dp2[3003][3003], sum[3003][3003];
int val[MAXN], nSize, numFish;

ll sub1(void) {
    ll sum(0);
    for (int i = 0; i < numFish; ++i)
        sum += fish[i].w;

    return sum;
}

ll sub2(void) {
    ll ans(0), sum0(0), sum1(0);
    int j(numFish);
    for (int i = 0; i < numFish; ++i) {
        if(fish[i].x == 0) {
            sum0 += fish[i].w;
        } else {
            if(j == numFish)
                j = i;

            sum1 += fish[i].w;
        }
    }

    ans = max(sum0, sum1);
    if(nSize == 2)
        return ans;

    sum0 = 0;
    for (int i = 0; i < numFish; ++i) {
        if(fish[i].x == 1)
            break;

        sum0 += fish[i].w;
        while(j < numFish && fish[j].y <= fish[i].y) {
            sum1 -= fish[j].w;
            ++j;
        }

        ans = max(ans, sum0 + sum1);
    }

    return ans;
}

ll sub3(void) {
    for (int i = 0; i <= 1; ++i)
        dp[i][0] = dp[i][1] = dp[i][2] = -1e18;

    for (int i = 0; i < numFish; ++i)
        val[fish[i].x] = fish[i].w;

    dp[0][2] = 0;
    for (int i = 0; i < nSize; ++i) {
        int pre(i & 1), cur(!pre);
        dp[cur][0] = max(dp[pre][0], max(dp[pre][1], dp[pre][2] + (i > 0 ? val[i - 1] : 0)));
        dp[cur][1] = dp[pre][0] + val[i];
        dp[cur][2] = max(dp[pre][2], dp[pre][1]);
    }

    return max({dp[nSize & 1][0], dp[nSize & 1][1], dp[nSize & 1][2]});
}

ll sub5(void) {
    for (int i = 0; i < nSize; ++i) {
        for (int j = 0; j <= nSize; ++j)
            sum[i][j] = 0;
    }

    for (int i = 0; i < numFish; ++i)
        sum[fish[i].x][fish[i].y + 1] += fish[i].w;

    for (int i = 0; i < nSize; ++i) {
        for (int j = 1; j <= nSize; ++j)
            sum[i][j] += sum[i][j - 1];
    }

    for (int j = 0; j <= nSize; ++j) {
        for (int k = 0; k <= nSize; ++k) {
            f[0][j][k] = -1e18;
        }
    }

    f[0][0][0] = 0;
    for (int j = 0; j <= nSize; ++j) {
        for (int k = 0; k <= nSize; ++k) {
            maxPre[j][k] = f[0][j][k];
            if(k > 0)
                maxPre[j][k] = max(maxPre[j][k], maxPre[j][k - 1]);
        }
    }

    for (int j = nSize; j >= 0; --j) {
        for (int k = nSize; k >= 0; --k) {
            maxSuf[j][k] = f[0][j][k];
            if(k + 1 < nSize)
                maxSuf[j][k] = max(maxSuf[j][k], maxSuf[j][k + 1]);
        }
    }

    for (int i = 0; i < nSize; ++i) {
        for (int coln = 0; coln <= nSize; ++coln) {
            for (int pcol = 0; pcol <= nSize; ++pcol) {
                if(coln <= pcol) {
                    f[i + 1][coln][pcol] = maxSuf[pcol][0] + sum[i][pcol] - sum[i][coln];
                    continue;
                }

                f[i + 1][coln][pcol] = maxPre[pcol][nSize] + (i > 0 ? sum[i - 1][coln] : 0);
                f[i + 1][coln][pcol] = max(f[i + 1][coln][pcol], maxSuf[pcol][0]);
            }
        }

        for (int j = 0; j <= nSize; ++j) {
            for (int k = 0; k <= nSize; ++k) {
                maxPre[j][k] = f[i + 1][j][k] - sum[i][max(j, k)];
                if(k > 0)
                    maxPre[j][k] = max(maxPre[j][k], maxPre[j][k - 1]);
            }
        }

        for (int j = nSize; j >= 0; --j) {
            for (int k = nSize; k >= 0; --k) {
                maxSuf[j][k] = f[i + 1][j][k];
                if(k < nSize)
                    maxSuf[j][k] = max(maxSuf[j][k], maxSuf[j][k + 1]);
            }
        }
    }

    ll res(0);
    for (int j = 0; j <= nSize; ++j)
        res = max(res, maxSuf[j][0]);

    return res;
}

ll sub6(void) {
    for (int i = 0; i <= nSize; ++i) {
        for (int j = 0; j <= nSize; ++j)
            sum[i][j] = 0;
    }

    for (int i = 0; i < numFish; ++i)
        sum[fish[i].x][fish[i].y + 1] += fish[i].w;

    for (int i = 0; i < nSize; ++i) {
        for (int j = 1; j <= nSize; ++j)
            sum[i][j] += sum[i][j - 1];
    }

    for (int j = 0; j <= nSize; ++j)
        dp[0][j] = dp2[0][j] = -1e18;

    dp[0][0] = dp2[0][0] = 0;
    for (int j = 0; j <= nSize; ++j) {
        ll val = dp2[0][j];
        maxPre[j][0] = (j == 0) ? val : max(maxPre[j - 1][0], val);
    }

    for (int j = nSize; j >= 0; --j) {
        ll val = dp[0][j] + sum[0][j];
        ll val2 = dp[0][j];
        maxSuf[j][0] = (j == nSize) ? val : max(maxSuf[j + 1][0], val);
        maxSuf[j][1] = (j == nSize) ? val2 : max(maxSuf[j + 1][1], val2);
    }

    for (int i = 0; i < nSize; ++i) {
        for (int coln = 0; coln <= nSize; ++coln) {
            dp[i + 1][coln] = maxSuf[coln][0] - sum[i][coln];
            dp[i + 1][coln] = max(dp[i + 1][coln], dp[i][coln]);
            dp[i + 1][coln] = max(dp[i + 1][coln], maxPre[coln][0] + (i > 0 ? sum[i - 1][coln] : 0));

            dp2[i + 1][coln] = maxPre[coln][0] + (i > 0 ? sum[i - 1][coln] : 0) - sum[i][coln];
            dp2[i + 1][coln] = max(dp2[i + 1][coln], maxSuf[coln][1]);
            dp2[i + 1][coln] = max(dp2[i + 1][coln], dp[i][coln] - sum[i][coln]);
        }

        for (int j = 0; j <= nSize; ++j) {
            ll val = dp2[i + 1][j];
            maxPre[j][0] = (j == 0) ? val : max(maxPre[j - 1][0], val);
        }

        for (int j = nSize; j >= 0; --j) {
            ll val = dp[i + 1][j] + sum[i + 1][j];
            ll val2 = dp[i + 1][j];
            maxSuf[j][0] = (j == nSize) ? val : max(maxSuf[j + 1][0], val);
            maxSuf[j][1] = (j == nSize) ? val2 : max(maxSuf[j + 1][1], val2);
        }
    }

    ll res(0);
    for (int j = 0; j <= nSize; ++j)
        res = max(res, dp[nSize][j]);

    return res;
}

ll max_weights(int _N, int _M, vector<int> _X, vector<int> _Y, vector<int> _W) {
    nSize = _N, numFish = _M;

    bool check1(1), check2(1), check3(1);
    for (int i = 0; i < numFish; ++i) {
        fish[i] = {_X[i], _Y[i], _W[i]};
        check1 &= !(fish[i].x & 1);
        check2 &= (fish[i].x <= 1);
        check3 &= (fish[i].y == 0);
    }

    sort(fish, fish + numFish, [](const Fish &a, const Fish &b) {
        return (a.x != b.x) ? a.x < b.x : a.y < b.y;
    });

    if(check1) {
        return sub1();
    } else
        if(check2) {
            return sub2();
        } else
            if(check3) {
                return sub3();
            } else
                if(nSize <= 300) {
                    return sub5();
                } else
                    if(nSize <= 3000) {
                        return sub6();
                    }
}

#ifdef Nhoksocqt1

bool dx[3003][3003];

int main(void) {
    ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);

    #define TASK "fish"
    if(fopen(TASK".inp", "r")) {
        freopen(TASK".inp", "r", stdin);
        freopen(TASK".out", "w", stdout);
    }

    vector<int> _X, _Y, _W;
    int _N, _M;
    cin >> _N >> _M;

    _X.resize(_M), _Y.resize(_M), _W.resize(_M);
    for (int i = 0; i < _M; ++i) {
        cin >> _X[i] >> _Y[i] >> _W[i];
        do { _X[i] = Random(0, _N - 1), _Y[i] = Random(0, _N - 1), _W[i] = Random(1, 100); } while(dx[_X[i]][_Y[i]]); dx[_X[i]][_Y[i]] = 1; cout << _X[i] << ' ' << _Y[i] << ' ' << _W[i] << '\n';
    }

    ll ans = max_weights(_N, _M, _X, _Y, _W);
    cout << "ANSWER: " << ans << '\n';
    cout << "SUB6: " << sub6() << '\n';

    return 0;
}

#endif // Nhoksocqt1

Compilation message

fish.cpp: In function 'll max_weights(int, int, std::vector<int>, std::vector<int>, std::vector<int>)':
fish.cpp:257:1: warning: control reaches end of non-void function [-Wreturn-type]
  257 | }
      | ^

Subtask #1
3.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 5724 KB Output is correct
2 Correct 29 ms 6744 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2440 KB Output is correct
5 Correct 95 ms 18024 KB Output is correct
6 Correct 103 ms 18260 KB Output is correct

Subtask #2
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 50 ms 10924 KB Output is correct
3 Correct 62 ms 12724 KB Output is correct
4 Correct 23 ms 5724 KB Output is correct
5 Correct 31 ms 6608 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2392 KB Output is correct
9 Correct 1 ms 2396 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 0 ms 2396 KB Output is correct
12 Correct 24 ms 5744 KB Output is correct
13 Correct 30 ms 6736 KB Output is correct
14 Correct 25 ms 5720 KB Output is correct
15 Correct 28 ms 5980 KB Output is correct
16 Correct 25 ms 5612 KB Output is correct
17 Correct 33 ms 5980 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 2 ms 6488 KB Output is correct
3 Correct 19 ms 8784 KB Output is correct
4 Correct 12 ms 8024 KB Output is correct
5 Correct 32 ms 10580 KB Output is correct
6 Correct 27 ms 10028 KB Output is correct
7 Correct 32 ms 10584 KB Output is correct
8 Correct 30 ms 10588 KB Output is correct

Subtask #4
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 12636 KB Output is correct
2 Correct 2 ms 16732 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2496 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 2 ms 12636 KB Output is correct
9 Correct 65 ms 119380 KB Output is correct
10 Correct 279 ms 233548 KB Output is correct
11 Correct 40 ms 119380 KB Output is correct
12 Correct 260 ms 233680 KB Output is correct
13 Correct 11 ms 63836 KB Output is correct
14 Correct 256 ms 233552 KB Output is correct

Subtask #5
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 12636 KB Output is correct
2 Correct 2 ms 16732 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2496 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 2 ms 12636 KB Output is correct
9 Correct 65 ms 119380 KB Output is correct
10 Correct 279 ms 233548 KB Output is correct
11 Correct 40 ms 119380 KB Output is correct
12 Correct 260 ms 233680 KB Output is correct
13 Correct 11 ms 63836 KB Output is correct
14 Correct 256 ms 233552 KB Output is correct
15 Correct 257 ms 233392 KB Output is correct
16 Correct 11 ms 64092 KB Output is correct
17 Correct 268 ms 235280 KB Output is correct
18 Correct 264 ms 235300 KB Output is correct
19 Correct 270 ms 235396 KB Output is correct
20 Correct 267 ms 235228 KB Output is correct
21 Correct 272 ms 235336 KB Output is correct
22 Correct 277 ms 237068 KB Output is correct
23 Correct 259 ms 233900 KB Output is correct
24 Correct 260 ms 234748 KB Output is correct
25 Correct 253 ms 233556 KB Output is correct
26 Correct 257 ms 234012 KB Output is correct

Subtask #6
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 12636 KB Output is correct
2 Correct 2 ms 16732 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2496 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 2 ms 12636 KB Output is correct
9 Correct 65 ms 119380 KB Output is correct
10 Correct 279 ms 233548 KB Output is correct
11 Correct 40 ms 119380 KB Output is correct
12 Correct 260 ms 233680 KB Output is correct
13 Correct 11 ms 63836 KB Output is correct
14 Correct 256 ms 233552 KB Output is correct
15 Correct 257 ms 233392 KB Output is correct
16 Correct 11 ms 64092 KB Output is correct
17 Correct 268 ms 235280 KB Output is correct
18 Correct 264 ms 235300 KB Output is correct
19 Correct 270 ms 235396 KB Output is correct
20 Correct 267 ms 235228 KB Output is correct
21 Correct 272 ms 235336 KB Output is correct
22 Correct 277 ms 237068 KB Output is correct
23 Correct 259 ms 233900 KB Output is correct
24 Correct 260 ms 234748 KB Output is correct
25 Correct 253 ms 233556 KB Output is correct
26 Correct 257 ms 234012 KB Output is correct
27 Correct 161 ms 230308 KB Output is correct
28 Correct 79 ms 81104 KB Output is correct
29 Correct 273 ms 244884 KB Output is correct
30 Correct 263 ms 244984 KB Output is correct
31 Correct 277 ms 244980 KB Output is correct
32 Correct 104 ms 68208 KB Output is correct
33 Correct 288 ms 244972 KB Output is correct
34 Correct 278 ms 244976 KB Output is correct
35 Correct 221 ms 236884 KB Output is correct
36 Correct 252 ms 244844 KB Output is correct

Subtask #7
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 2 ms 6488 KB Output is correct
3 Correct 19 ms 8784 KB Output is correct
4 Correct 12 ms 8024 KB Output is correct
5 Correct 32 ms 10580 KB Output is correct
6 Correct 27 ms 10028 KB Output is correct
7 Correct 32 ms 10584 KB Output is correct
8 Correct 30 ms 10588 KB Output is correct
9 Runtime error 886 ms 912568 KB Execution killed with signal 11
10 Halted 0 ms 0 KB -

Subtask #8
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 5724 KB Output is correct
2 Correct 29 ms 6744 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2440 KB Output is correct
5 Correct 95 ms 18024 KB Output is correct
6 Correct 103 ms 18260 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 50 ms 10924 KB Output is correct
9 Correct 62 ms 12724 KB Output is correct
10 Correct 23 ms 5724 KB Output is correct
11 Correct 31 ms 6608 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 1 ms 2396 KB Output is correct
14 Correct 1 ms 2392 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 1 ms 2396 KB Output is correct
17 Correct 0 ms 2396 KB Output is correct
18 Correct 24 ms 5744 KB Output is correct
19 Correct 30 ms 6736 KB Output is correct
20 Correct 25 ms 5720 KB Output is correct
21 Correct 28 ms 5980 KB Output is correct
22 Correct 25 ms 5612 KB Output is correct
23 Correct 33 ms 5980 KB Output is correct
24 Correct 1 ms 2396 KB Output is correct
25 Correct 2 ms 6488 KB Output is correct
26 Correct 19 ms 8784 KB Output is correct
27 Correct 12 ms 8024 KB Output is correct
28 Correct 32 ms 10580 KB Output is correct
29 Correct 27 ms 10028 KB Output is correct
30 Correct 32 ms 10584 KB Output is correct
31 Correct 30 ms 10588 KB Output is correct
32 Correct 2 ms 12636 KB Output is correct
33 Correct 2 ms 16732 KB Output is correct
34 Correct 1 ms 2396 KB Output is correct
35 Correct 1 ms 2396 KB Output is correct
36 Correct 1 ms 2396 KB Output is correct
37 Correct 1 ms 2496 KB Output is correct
38 Correct 1 ms 2396 KB Output is correct
39 Correct 2 ms 12636 KB Output is correct
40 Correct 65 ms 119380 KB Output is correct
41 Correct 279 ms 233548 KB Output is correct
42 Correct 40 ms 119380 KB Output is correct
43 Correct 260 ms 233680 KB Output is correct
44 Correct 11 ms 63836 KB Output is correct
45 Correct 256 ms 233552 KB Output is correct
46 Correct 257 ms 233392 KB Output is correct
47 Correct 11 ms 64092 KB Output is correct
48 Correct 268 ms 235280 KB Output is correct
49 Correct 264 ms 235300 KB Output is correct
50 Correct 270 ms 235396 KB Output is correct
51 Correct 267 ms 235228 KB Output is correct
52 Correct 272 ms 235336 KB Output is correct
53 Correct 277 ms 237068 KB Output is correct
54 Correct 259 ms 233900 KB Output is correct
55 Correct 260 ms 234748 KB Output is correct
56 Correct 253 ms 233556 KB Output is correct
57 Correct 257 ms 234012 KB Output is correct
58 Correct 161 ms 230308 KB Output is correct
59 Correct 79 ms 81104 KB Output is correct
60 Correct 273 ms 244884 KB Output is correct
61 Correct 263 ms 244984 KB Output is correct
62 Correct 277 ms 244980 KB Output is correct
63 Correct 104 ms 68208 KB Output is correct
64 Correct 288 ms 244972 KB Output is correct
65 Correct 278 ms 244976 KB Output is correct
66 Correct 221 ms 236884 KB Output is correct
67 Correct 252 ms 244844 KB Output is correct
68 Runtime error 886 ms 912568 KB Execution killed with signal 11
69 Halted 0 ms 0 KB -