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답안 #142536

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
142536 2019-08-09T11:52:12 Z alextodoran Pinball (JOI14_pinball) C++14
29 / 100
 1000 ms 41084 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 lvn[N_MAX], rvn[N_MAX];
int lvp[N_MAX], rvp[N_MAX];

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;
            lv[++cntl] = pos;
        }
        if(objects[i].type == 'R')
        {
            devices[objects[i].index].r = pos;
            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 <= cntl; i++)
    {
        lvn[i] = i + 1;
        lvp[i] = i - 1;
    }
    for(int i = 1; i <= cntr; i++)
    {
        rvn[i] = i + 1;
        rvp[i] = i - 1;
    }
    for(int i = 1; i <= m; i++)
    {
        for(int j1 = cntl; j1 >= 1; j1--)
            if(lv[j1] != -1)
            {
                int l = lv[j1];
                for(int j2 = start[j1]; j2 <= cntr; j2++)
                    if(rv[j2] != -1)
                    {
                        int r = rv[j2];
                        dp[i & 1][l][r] = min(dp[(i & 1) ^ 1][l][r], min(dp[i & 1][lv[lvn[j1]]][r], dp[i & 1][l][rv[rvp[j2]]]));
                        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);
        for(int j = 1; j <= cntl; j++)
            if(lv[j] == devices[i].l)
            {
                lvn[lvp[j]] = lvn[j];
                lvp[lvn[j]] = lvp[j];
                lv[j] = -1;
                break;
            }
        for(int j = 1; j <= cntr; j++)
            if(rv[j] == devices[i].r)
            {
                rvn[rvp[j]] = rvn[j];
                rvp[rvn[j]] = rvp[j];
                rv[j] = -1;
                break;
            }
    }
    if(ans == INF)
        cout << "-1\n";
    else
        cout << ans << "\n";
    return 0;
}

Compilation message

pinball.cpp: In function 'int main()':
pinball.cpp:76:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < objects.size(); i++)
                    ~~^~~~~~~~~~~~~~~~
pinball.cpp:155:29: 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:38:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

Subtask #1
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 504 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 632 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 380 KB Output is correct
8 Correct 2 ms 504 KB Output is correct

Subtask #2
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 504 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 632 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 380 KB Output is correct
8 Correct 2 ms 504 KB Output is correct
9 Correct 17 ms 1148 KB Output is correct
10 Correct 21 ms 2680 KB Output is correct
11 Correct 20 ms 3832 KB Output is correct
12 Correct 20 ms 10852 KB Output is correct
13 Correct 20 ms 11128 KB Output is correct
14 Correct 19 ms 10872 KB Output is correct

Subtask #3
0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 504 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 632 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 380 KB Output is correct
8 Correct 2 ms 504 KB Output is correct
9 Correct 17 ms 1148 KB Output is correct
10 Correct 21 ms 2680 KB Output is correct
11 Correct 20 ms 3832 KB Output is correct
12 Correct 20 ms 10852 KB Output is correct
13 Correct 20 ms 11128 KB Output is correct
14 Correct 19 ms 10872 KB Output is correct
15 Correct 5 ms 1272 KB Output is correct
16 Correct 2 ms 376 KB Output is correct
17 Execution timed out 1068 ms 41084 KB Time limit exceeded
18 Halted 0 ms 0 KB -

Subtask #4
0 / 49.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 504 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 632 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 380 KB Output is correct
8 Correct 2 ms 504 KB Output is correct
9 Correct 17 ms 1148 KB Output is correct
10 Correct 21 ms 2680 KB Output is correct
11 Correct 20 ms 3832 KB Output is correct
12 Correct 20 ms 10852 KB Output is correct
13 Correct 20 ms 11128 KB Output is correct
14 Correct 19 ms 10872 KB Output is correct
15 Correct 5 ms 1272 KB Output is correct
16 Correct 2 ms 376 KB Output is correct
17 Execution timed out 1068 ms 41084 KB Time limit exceeded
18 Halted 0 ms 0 KB -