Submission #808349

#	Time	Username	Problem	Language	Result	Execution time	Memory
808349		drdilyor	Carnival Tickets (IOI20_tickets)	C++17	62 / 100	3048 ms	2097152 KiB

tickets

#include<bits/stdc++.h>
#include "tickets.h"
using namespace std;
using ll = long long;
const int inf = 1e9;

#ifdef ONPC
#define debug(args...) {cout << "[" << #args << "]: "; debug_out(args);}
#else
#define debug(args...) {42;}
#endif

void debug_out() {
    cout << endl;
}
template<typename H, typename... T>
void debug_out(vector<H> h, T... t) {
    cout << "{";
    for (H i : h) cout << i << ", ";
    cout << "}, ";
    debug_out(t...);
}
template<typename H, typename... T>
void debug_out(H h, T... t) {
    cout << h << ", ";
    debug_out(t...);
}

long long find_maximum(int k, std::vector<std::vector<int>> x) {
	int n = x.size();
	int m = x[0].size();
    vector<tuple<int,int,int>> pos(n);
    for (int i = 0; i < n; i++)
        pos[i] = {-x[i][0], x[i][m-1], i};

    sort(pos.begin(), pos.end(), [&](auto a, auto b) {
            return get<1>(a) - get<0>(a) > get<1>(b) - get<0>(b);
    });

    int space = m - k;
    vector score(n, vector<ll>());
    for (int i = 0; i < n; i++) {
        ll cur = accumulate(x[i].begin(), x[i].end(), 0ll);
        ll base = cur;
        if (!space) score[i].push_back(0);
        for (int j = 0; j < m; j++) {
            cur -= x[i][j];
            if (j >= space) {
                cur += -x[i][j - space];
            }
            if (j >= space-1)
                score[i].push_back(cur - base);
        }
        assert((int)score[i].size() == k + 1);
        debug(i, score[i]);
    }

    constexpr ll infl = 1e18;
    vector dp(n+1, vector<ll>(n / 2 * k + 1, -infl));
    vector par(n+1, vector<int>(n / 2 * k + 1, -1));
    dp[n][0] = 0;
    for (int i = n-1; i >= 0; i--) {
        for (int rem = 0; rem <= n / 2 * k; rem++) {
            for (int use = 0; use <= k&& use <= rem; use++) {
                if (dp[i+1][rem - use] + score[i][use] > dp[i][rem]) {
                    dp[i][rem] = dp[i+1][rem - use] + score[i][use];
                    par[i][rem] = use;
                }
            }
        }
        debug(i, dp[i], par[i]);
    }
    debug(dp[0][n/2 * k]);

    vector<int> use(n);
    for (int i = 0, rem = n / 2 * k; i < n; i++) {
        use[i] = par[i][rem];
        rem -= par[i][rem];
    }
    debug(use);

    vector type(n, vector<int>(m, 0));
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < use[i]; j++)
            type[i][j] = -1;
        for (int j = 0; j < k - use[i]; j++)
            rbegin(type[i])[j] = 1;
    }

    ll sum = 0;
    vector ans(n, vector<int>(m, -1));
    int round_low = 0;
    for (int i = 0; i < n; i++) {
        debug(i, ans[i]);
        for (int j = 0; j < m; j++) {
            if (type[i][j] == -1) {
                sum -= x[i][j];
                ans[i][j] = round_low++;
                if (round_low >= k) round_low -= k;
            }
        }
        int round = round_low;
        for (int j = 0; j < m; j++) {
            if (type[i][j] == 1) {
                sum += x[i][j];
                ans[i][j] = round++;
                if (round >= k) round -= k;
            }
        }
        debug(i, ans[i]);
    }
    allocate_tickets(ans);
    return sum;
}

Compilation message (stderr)

tickets.cpp: In function 'long long int find_maximum(int, std::vector<std::vector<int> >)':
tickets.cpp:10:25: warning: statement has no effect [-Wunused-value]
   10 | #define debug(args...) {42;}
      |                         ^~
tickets.cpp:55:9: note: in expansion of macro 'debug'
   55 |         debug(i, score[i]);
      |         ^~~~~
tickets.cpp:10:25: warning: statement has no effect [-Wunused-value]
   10 | #define debug(args...) {42;}
      |                         ^~
tickets.cpp:71:9: note: in expansion of macro 'debug'
   71 |         debug(i, dp[i], par[i]);
      |         ^~~~~
tickets.cpp:10:25: warning: statement has no effect [-Wunused-value]
   10 | #define debug(args...) {42;}
      |                         ^~
tickets.cpp:73:5: note: in expansion of macro 'debug'
   73 |     debug(dp[0][n/2 * k]);
      |     ^~~~~
tickets.cpp:10:25: warning: statement has no effect [-Wunused-value]
   10 | #define debug(args...) {42;}
      |                         ^~
tickets.cpp:80:5: note: in expansion of macro 'debug'
   80 |     debug(use);
      |     ^~~~~
tickets.cpp:10:25: warning: statement has no effect [-Wunused-value]
   10 | #define debug(args...) {42;}
      |                         ^~
tickets.cpp:94:9: note: in expansion of macro 'debug'
   94 |         debug(i, ans[i]);
      |         ^~~~~
tickets.cpp:10:25: warning: statement has no effect [-Wunused-value]
   10 | #define debug(args...) {42;}
      |                         ^~
tickets.cpp:110:9: note: in expansion of macro 'debug'
  110 |         debug(i, ans[i]);
      |         ^~~~~

• Subtask 1: 11 / 11
• Subtask 2: 16 / 16
• Subtask 3: 0 / 14
• Subtask 4: 0 / 14
• Subtask 5: 12 / 12
• Subtask 6: 23 / 23
• Subtask 7: 0 / 10