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Submission #551853

# Submission time Handle Problem Language Result Execution time Memory
551853 2022-04-21T18:23:26 Z nicolaalexandra Swapping Cities (APIO20_swap) C++14
13 / 100
 178 ms 53440 KB 
#include <bits/stdc++.h>
#include "swap.h"
#define DIM 200010
#define INF 2000000000
using namespace std;

struct muchie{
    int x,y,cost;
} mch[DIM];

vector<pair <int,int> > L[DIM];
vector <int> edg[DIM];
pair <int,int> rmq[20][DIM*3];
int t[DIM],ok[DIM],g[DIM],dp[DIM],p[DIM],level[DIM],E[DIM*3],first[DIM],g2[DIM];
int n,m,subtask,maxi,k;

inline int cmp (muchie a, muchie b){
    return a.cost < b.cost;
}

inline int get_rad (int x){
    while (t[x] > 0)
        x = t[x];
    return x;
}

void dfs (int nod, int tata){

    E[++k] = nod;
    first[nod] = k;
    level[nod] = 1 + level[tata];
    for (auto vecin : edg[nod]){
        if (vecin != tata){
            dfs (vecin,nod);
            E[++k] = nod;
        }
    }

}

inline int get_lca (int x, int y){
    int posx = first[x], posy = first[y];
    if (posx > posy)
        swap (posx,posy);
    int nr = p[posy-posx+1];
    pair <int,int> sol = min (rmq[nr][posx], rmq[nr][posy-(1<<nr)+1]);
    return E[sol.second];
}

void init(int N, int M, vector<int> U, vector<int> V, vector<int> W) {

    int i,j,rad;

    n = N, m = M;
    for (i=0;i<m;i++){
        int x = U[i], y = V[i], cost = W[i];
        x++, y++;

        L[x].push_back(make_pair(y,cost));
        L[y].push_back(make_pair(x,cost));
        maxi = max (maxi,cost);

        mch[i+1] = {x,y,cost};
    }

    subtask = 1;
    for (i=1;i<=n;i++)
        if (L[i].size() > 2)
            subtask = 0;

    sort (mch+1,mch+m+1,cmp);

    for (i=1;i<=n;i++){
        t[i] = dp[i] = -1;
        ok[i] = g[i] = g2[i] = 0;
        //a[i].push_back(i);
    }

    /// ok[i] - cand devine ok componenta cu radacina in i
    for (i=1;i<=m;i++){

        int x = mch[i].x, y = mch[i].y;
        int radx = get_rad(x), rady = get_rad(y);

        if (radx != rady){
            if (t[radx] > t[rady])
                swap (radx, rady);

            if (!ok[radx] && ok[rady])
                ok[radx] = i;


            if (ok[radx] && !ok[rady])
                ok[rady] = i;


            edg[radx].push_back(rady); /// arborele unirilor
            g2[rady]++;

            t[radx] += t[rady];
            t[rady] = radx;

            g[x]++, g[y]++;
            if (g[x] >= 3 || g[y] >= 3){
                if (!ok[radx])
                    ok[radx] = i;
            }
        } else {
            /// o sa am un ciclu in componenta asta

            if (!ok[radx])
                ok[radx] = i;
        }
    }

    for (i=1;i<=n;i++)
        if (!g2[i])
            rad = i;

    dfs (rad,0);

    for (i=1;i<=k;i++)
        rmq[0][i] = make_pair(level[E[i]],i);

    for (i=1;(1<<i)<=k;i++)
        for (j=1;j<=k;j++){
            rmq[i][j] = rmq[i-1][j];
            if (j + (1<<(i-1)) <= k && rmq[i-1][j + (1<<(i-1))].first < rmq[i][j].first)
                rmq[i][j] = rmq[i-1][j + (1<<(i-1))];
        }

    for (i=2;i<=k;i++)
        p[i] = p[i/2] + 1;
}


int getMinimumFuelCapacity(int X, int Y) {

    if (subtask == 1){
        if (m == n-1)
            return -1;
        else return maxi;
    }

    X++, Y++;

    int maxim = 0;
    while (X != Y){

        if (level[X] > level[Y]){
            maxim = max (maxim,mch[ok[X]].cost);
            X = t[X];
        } else {
            if (level[X] < level[Y]){
                maxim = max (maxim,mch[ok[Y]].cost);
                Y = t[Y];
            } else {
                maxim = max (maxim,mch[ok[X]].cost);
                maxim = max (maxim,mch[ok[Y]].cost);
                X = t[X], Y = t[Y];
            }

        }

    }

    if (!maxim){
        while (X > 0){
            if (ok[X]){
                maxim = max (maxim,mch[ok[X]].cost);
                break;
            }
            X = t[X];
        }
    }

    if (!maxim)
        return -1;
    else return maxim;


}
/*
int main (){

    FILE *fin = fopen ("date.in", "r");
    FILE *fout = fopen ("date.out", "w");

    int N, M;
    assert(2 == fscanf(fin, "%d %d", &N, &M));

    std::vector<int> U(M), V(M), W(M);
    for (int i = 0; i < M; ++i) {
        assert(3 == fscanf(fin, "%d %d %d", &U[i], &V[i], &W[i]));
    }

    int Q;
    assert(1 == fscanf(fin,"%d", &Q));

    std::vector<int> X(Q), Y(Q);
    for (int i = 0; i < Q; ++i) {
        assert(2 == fscanf(fin,"%d %d", &X[i], &Y[i]));
    }

    init(N, M, U, V, W);

    std::vector<int> minimum_fuel_capacities(Q);
    for (int i = 0; i < Q; ++i) {
        minimum_fuel_capacities[i] = getMinimumFuelCapacity(X[i], Y[i]);
    }

    for (int i = 0; i < Q; ++i) {
        fprintf(fout, "%d\n", minimum_fuel_capacities[i]);
    }



    return 0;
}

*/

Compilation message

swap.cpp: In function 'void init(int, int, std::vector<int>, std::vector<int>, std::vector<int>)':
swap.cpp:120:9: warning: 'rad' may be used uninitialized in this function [-Wmaybe-uninitialized]
  120 |     dfs (rad,0);
      |     ~~~~^~~~~~~

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 9684 KB Output is correct
2 Correct 5 ms 9684 KB Output is correct
3 Correct 6 ms 9684 KB Output is correct
4 Correct 6 ms 9940 KB Output is correct
5 Correct 6 ms 10104 KB Output is correct
6 Correct 7 ms 10068 KB Output is correct
7 Correct 6 ms 10080 KB Output is correct
8 Correct 6 ms 10068 KB Output is correct
9 Correct 77 ms 41548 KB Output is correct
10 Correct 88 ms 48728 KB Output is correct
11 Correct 83 ms 48120 KB Output is correct
12 Correct 105 ms 50304 KB Output is correct
13 Correct 91 ms 49508 KB Output is correct
14 Correct 74 ms 41608 KB Output is correct
15 Correct 133 ms 50744 KB Output is correct
16 Correct 135 ms 49760 KB Output is correct
17 Correct 147 ms 52116 KB Output is correct
18 Correct 132 ms 51336 KB Output is correct
19 Correct 74 ms 18984 KB Output is correct
20 Correct 168 ms 52124 KB Output is correct
21 Correct 138 ms 50768 KB Output is correct
22 Correct 178 ms 53440 KB Output is correct
23 Correct 151 ms 52784 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 9684 KB Output is correct
2 Correct 5 ms 9684 KB Output is correct
3 Correct 118 ms 51564 KB Output is correct
4 Correct 166 ms 53388 KB Output is correct
5 Correct 137 ms 52348 KB Output is correct
6 Correct 121 ms 53248 KB Output is correct
7 Correct 137 ms 52820 KB Output is correct
8 Correct 122 ms 51268 KB Output is correct
9 Correct 127 ms 52576 KB Output is correct
10 Correct 126 ms 50792 KB Output is correct

Subtask #3
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 9684 KB Output is correct
2 Correct 5 ms 9684 KB Output is correct
3 Correct 6 ms 9684 KB Output is correct
4 Correct 6 ms 9940 KB Output is correct
5 Correct 6 ms 10104 KB Output is correct
6 Correct 7 ms 10068 KB Output is correct
7 Correct 6 ms 10080 KB Output is correct
8 Correct 6 ms 10068 KB Output is correct
9 Correct 7 ms 9676 KB Output is correct
10 Incorrect 6 ms 10068 KB Output isn't correct
11 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 9676 KB Output is correct
2 Correct 5 ms 9684 KB Output is correct
3 Correct 5 ms 9684 KB Output is correct
4 Correct 6 ms 9684 KB Output is correct
5 Correct 6 ms 9940 KB Output is correct
6 Correct 6 ms 10104 KB Output is correct
7 Correct 7 ms 10068 KB Output is correct
8 Correct 6 ms 10080 KB Output is correct
9 Correct 6 ms 10068 KB Output is correct
10 Correct 77 ms 41548 KB Output is correct
11 Correct 88 ms 48728 KB Output is correct
12 Correct 83 ms 48120 KB Output is correct
13 Correct 105 ms 50304 KB Output is correct
14 Correct 91 ms 49508 KB Output is correct
15 Incorrect 6 ms 10068 KB Output isn't correct
16 Halted 0 ms 0 KB -

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 9684 KB Output is correct
2 Correct 5 ms 9684 KB Output is correct
3 Correct 6 ms 9684 KB Output is correct
4 Correct 6 ms 9940 KB Output is correct
5 Correct 6 ms 10104 KB Output is correct
6 Correct 7 ms 10068 KB Output is correct
7 Correct 6 ms 10080 KB Output is correct
8 Correct 6 ms 10068 KB Output is correct
9 Correct 77 ms 41548 KB Output is correct
10 Correct 88 ms 48728 KB Output is correct
11 Correct 83 ms 48120 KB Output is correct
12 Correct 105 ms 50304 KB Output is correct
13 Correct 91 ms 49508 KB Output is correct
14 Correct 74 ms 41608 KB Output is correct
15 Correct 133 ms 50744 KB Output is correct
16 Correct 135 ms 49760 KB Output is correct
17 Correct 147 ms 52116 KB Output is correct
18 Correct 132 ms 51336 KB Output is correct
19 Correct 118 ms 51564 KB Output is correct
20 Correct 166 ms 53388 KB Output is correct
21 Correct 137 ms 52348 KB Output is correct
22 Correct 121 ms 53248 KB Output is correct
23 Correct 137 ms 52820 KB Output is correct
24 Correct 122 ms 51268 KB Output is correct
25 Correct 127 ms 52576 KB Output is correct
26 Correct 126 ms 50792 KB Output is correct
27 Incorrect 6 ms 10068 KB Output isn't correct
28 Halted 0 ms 0 KB -

Subtask #6
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 9676 KB Output is correct
2 Correct 5 ms 9684 KB Output is correct
3 Correct 5 ms 9684 KB Output is correct
4 Correct 6 ms 9684 KB Output is correct
5 Correct 6 ms 9940 KB Output is correct
6 Correct 6 ms 10104 KB Output is correct
7 Correct 7 ms 10068 KB Output is correct
8 Correct 6 ms 10080 KB Output is correct
9 Correct 6 ms 10068 KB Output is correct
10 Correct 77 ms 41548 KB Output is correct
11 Correct 88 ms 48728 KB Output is correct
12 Correct 83 ms 48120 KB Output is correct
13 Correct 105 ms 50304 KB Output is correct
14 Correct 91 ms 49508 KB Output is correct
15 Correct 74 ms 41608 KB Output is correct
16 Correct 133 ms 50744 KB Output is correct
17 Correct 135 ms 49760 KB Output is correct
18 Correct 147 ms 52116 KB Output is correct
19 Correct 132 ms 51336 KB Output is correct
20 Correct 118 ms 51564 KB Output is correct
21 Correct 166 ms 53388 KB Output is correct
22 Correct 137 ms 52348 KB Output is correct
23 Correct 121 ms 53248 KB Output is correct
24 Correct 137 ms 52820 KB Output is correct
25 Correct 122 ms 51268 KB Output is correct
26 Correct 127 ms 52576 KB Output is correct
27 Correct 126 ms 50792 KB Output is correct
28 Incorrect 6 ms 10068 KB Output isn't correct
29 Halted 0 ms 0 KB -