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Submission #142500

# Submission time Handle Problem Language Result Execution time Memory
142500 2019-08-09T10:33:24 Z alextodoran Pinball (JOI14_pinball) C++14
29 / 100
 1000 ms 40952 KB 
#include <bits/stdc++.h>

#define M_MAX 1002
#define N_MAX 3002
#define ll long long

using namespace std;

const ll INF = 100000000000000001;

struct Device
{
    int l, r;
    int hole;
    ll cost;
};

int n, m;

Device devices[M_MAX];

struct Object
{
    int pos;
    char type;
    int index;
};

int f (char type)
{
    if(type == 'L')
        return 1;
    if(type == 'H')
        return 2;
    if(type == 'R')
        return 3;
}

bool operator < (const Object &a, const Object &b)
{
    if(a.pos != b.pos)
        return a.pos < b.pos;
    return f(a.type) < f(b.type);
}

vector <Object> objects;

ll dp[2][N_MAX][N_MAX];

set <int> active;

int lv[N_MAX], rv[N_MAX];
int cntl, cntr;

int start[N_MAX];

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    cin >> m >> n;
    for(int i = 1; i <= m; i++)
    {
        cin >> devices[i].l >> devices[i].r >> devices[i].hole >> devices[i].cost;
        objects.push_back(Object{devices[i].l, 'L', i});
        objects.push_back(Object{devices[i].r, 'R', i});
        objects.push_back(Object{devices[i].hole, 'H', i});
    }
    sort(objects.begin(), objects.end());
    int pos = 1;
    int lastR = 0;
    for(int i = 0; i < objects.size(); i++)
    {
        if(i > 0 && active.empty() && objects[i].pos - lastR > 1)
        {
            cout << "-1\n";
            return 0;
        }
        if(objects[i].type == 'L')
            active.insert(objects[i].index);
        else if(objects[i].type == 'R')
        {
            lastR = objects[i].pos;
            active.erase(objects[i].index);
        }
        if(i > 0 && objects[i].pos > objects[i - 1].pos)
            pos++;
        if(objects[i].type == 'L')
        {
            devices[objects[i].index].l = pos;
            if(pos > lv[cntl])
                lv[++cntl] = pos;
        }
        if(objects[i].type == 'R')
        {
            devices[objects[i].index].r = pos;
            if(pos > rv[cntr])
                rv[++cntr] = pos;
        }
        if(objects[i].type == 'H')
            devices[objects[i].index].hole = pos;
    }
    if(n > objects.back().pos || objects.front().pos > 1)
    {
        cout << "-1\n";
        return 0;
    }
    n = pos;
    for(int i = 0; i <= 1; i++)
        for(int l = 0; l <= n + 1; l++)
            for(int r = 0; r <= n + 1; r++)
                dp[i][l][r] = INF;
    dp[0][1][n] = 0;
    ll ans = INF;
    start[cntl + 1] = cntr + 1;
    for(int j1 = cntl; j1 >= 1; j1--)
    {
        start[j1] = start[j1 + 1];
        int l = lv[j1];
        while(start[j1] > 1 && rv[start[j1] - 1] >= l)
            start[j1]--;
    }
    for(int i = 1; i <= m; i++)
    {
        for(int j1 = cntl; j1 >= 1; j1--)
        {
            int l = lv[j1];
            for(int j2 = start[j1]; j2 <= cntr; j2++)
            {
                int r = rv[j2];
                dp[i & 1][l][r] = min(dp[(i & 1) ^ 1][l][r], min(dp[i & 1][lv[j1 + 1]][r], dp[i & 1][l][rv[j2 - 1]]));
                if(devices[i].hole >= l && devices[i].hole <= r)
                {
                    int l1 = l, r1 = r;
                    l1 = min(l1, devices[i].l);
                    r1 = max(r1, devices[i].r);
                    dp[i & 1][l][r] = min(dp[i & 1][l][r], dp[(i & 1) ^ 1][l1][r1] + devices[i].cost);
                }
            }
        }
        ans = min(ans, dp[i & 1 ^ 1][devices[i].l][devices[i].r] + devices[i].cost);
    }
    if(ans == INF)
        cout << "-1\n";
    else
        cout << ans << "\n";
    return 0;
}

Compilation message

pinball.cpp: In function 'int main()':
pinball.cpp:73:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < objects.size(); i++)
                    ~~^~~~~~~~~~~~~~~~
pinball.cpp:142:29: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
         ans = min(ans, dp[i & 1 ^ 1][devices[i].l][devices[i].r] + devices[i].cost);
                           ~~^~~
pinball.cpp: In function 'int f(char)':
pinball.cpp:37:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 504 KB Output is correct
3 Correct 2 ms 632 KB Output is correct
4 Correct 2 ms 504 KB Output is correct
5 Correct 2 ms 632 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 504 KB Output is correct

Subtask #2
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 504 KB Output is correct
3 Correct 2 ms 632 KB Output is correct
4 Correct 2 ms 504 KB Output is correct
5 Correct 2 ms 632 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 504 KB Output is correct
9 Correct 4 ms 1144 KB Output is correct
10 Correct 9 ms 2680 KB Output is correct
11 Correct 14 ms 3704 KB Output is correct
12 Correct 32 ms 10872 KB Output is correct
13 Correct 31 ms 10872 KB Output is correct
14 Correct 31 ms 11000 KB Output is correct

Subtask #3
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 504 KB Output is correct
3 Correct 2 ms 632 KB Output is correct
4 Correct 2 ms 504 KB Output is correct
5 Correct 2 ms 632 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 504 KB Output is correct
9 Correct 4 ms 1144 KB Output is correct
10 Correct 9 ms 2680 KB Output is correct
11 Correct 14 ms 3704 KB Output is correct
12 Correct 32 ms 10872 KB Output is correct
13 Correct 31 ms 10872 KB Output is correct
14 Correct 31 ms 11000 KB Output is correct
15 Correct 3 ms 1272 KB Output is correct
16 Correct 2 ms 376 KB Output is correct
17 Execution timed out 1071 ms 40952 KB Time limit exceeded
18 Halted 0 ms 0 KB -

Subtask #4
0 / 49.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 504 KB Output is correct
3 Correct 2 ms 632 KB Output is correct
4 Correct 2 ms 504 KB Output is correct
5 Correct 2 ms 632 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 504 KB Output is correct
9 Correct 4 ms 1144 KB Output is correct
10 Correct 9 ms 2680 KB Output is correct
11 Correct 14 ms 3704 KB Output is correct
12 Correct 32 ms 10872 KB Output is correct
13 Correct 31 ms 10872 KB Output is correct
14 Correct 31 ms 11000 KB Output is correct
15 Correct 3 ms 1272 KB Output is correct
16 Correct 2 ms 376 KB Output is correct
17 Execution timed out 1071 ms 40952 KB Time limit exceeded
18 Halted 0 ms 0 KB -