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Submission #248553

# Submission time Handle Problem Language Result Execution time Memory
248553 2020-07-12T17:32:41 Z alexandra_udristoiu Parachute rings (IOI12_rings) C++14
52 / 100
 4000 ms 144884 KB 
#include<vector>
using namespace std;
const int dim = 1000005;
int n, nr3, nr4, m, num, nrcomp, nrcic, np;
int r[dim], g[dim], viz[dim], t[dim], frst[dim], cic[dim], rp[dim], r2[20][dim], nrc[20], nnod[20];
pair<int, int> w[dim];
vector<int> v[dim], g3, g4;
int rad(int x){
    int aux, y = x;
    while(r[x] > 0){
        x = r[x];
    }
    while(r[y] > 0){
        aux = r[y];
        r[y] = x;
        y = aux;
    }
    return x;
}
void uneste(int i, int x, int y){
    if(x == nnod[i] || y == nnod[i]){
        return;
    }
    int ax = x, ay = y, aux;
    while(r2[i][x] >= 0){
        x = r2[i][x];
    }
    while(r2[i][y] >= 0){
        y = r2[i][y];
    }
    while(r2[i][ax] > 0){
        aux = r2[i][ax];
        r2[i][ax] = x;
        ax = aux;
    }
    while(r2[i][ay] > 0){
        aux = r2[i][ay];
        r2[i][ay] = y;
        ay = aux;
    }
    if(x != y){
        nrc[i]++;
        if(r2[i][x] > r2[i][y]){
            r2[i][x] += r2[i][y];
            r2[i][y] = x;
        }
        else{
            r2[i][y] += r2[i][x];
            r2[i][x] = y;
        }
    }
}
void update(int nod){
    if(rp[nod] == 0 && g3.size() < 4 && g4.size() == 0){
        np++;
        rp[nod] = np;
        nnod[np] = nod;
        for(int i = 1; i <= m; i++){
            uneste(np, w[i].first, w[i].second);
        }
    }
}
void upd(int nod){
    if(g[nod] == 4){
        nr3--;
        nr4++;
        g4.push_back(nod);
    }
    else if(g[nod] == 3){
        nr3++;
        g3.push_back(nod);
        update(nod);
        for(int i = 0; i < v[nod].size(); i++){
            frst[ v[nod][i] ] = nod;
            update(v[nod][i]);
        }
    }
}
int verif(int nod){
    if(m - g[nod] != nrc[ rp[nod] ] ){
        return 0;
    }
    int i, n3 = 0;
    if(g[nod] == 3){
        n3++;
    }
    for(int i = 0; i < v[nod].size(); i++){
        if(g[ v[nod][i] ] == 3){
            n3++;
        }
    }
    if(n3 != nr3){
        return 0;
    }
    return 1;
}

void Init(int N) {
    n = N;
    for(int i = 0; i < n; i++){
        r[i] = -1;
        for(int ii = 1; ii <= 18; ii++){
            r2[ii][i] = -1;
        }
    }
}

static void dfs(int nod, int tt){
    t[nod] = tt;
    for(int i = 0; i < v[nod].size(); i++){
        if(v[nod][i] != tt){
            dfs(v[nod][i], nod);
        }
    }
}
void Link(int x, int y) {
    int r1, r2, nod;
    g[x]++;
    g[y]++;
    if(g[x] == 3){
        frst[y] = x;
        update(y);
    }
    if(g[y] == 3){
        frst[x] = y;
        update(x);
    }
    upd(x);
    upd(y);
    r1 = rad(x);
    r2 = rad(y);
    m++;
    if(r1 != r2){
        if(r[r1] < r[r2]){
            r[r1] += r[r2];
            r[r2] = r1;
            cic[r1] |= cic[r2];
        }
        else{
            r[r2] += r[r1];
            r[r1] = r2;
            cic[r2] |= cic[r1];
            swap(r1, r2);
        }
    }
    else{
        nrcic++;
        if(nrcic == 1){
            t[x] = -1;
            dfs(x, -1);
            nod = y;
            while(nod != -1){
                viz[nod] = 1;
                nod = t[nod];
                num++;
            }
        }
        if(cic[r1] == 0){
            nrcomp++;
            cic[r1] = 1;
        }
    }
    v[x].push_back(y);
    v[y].push_back(x);
    w[m] = make_pair(x, y);
    for(int i = 1; i <= np; i++){
        uneste(i, x, y);
    }
}

int CountCritical() {
    if(nr4 > 1){
        return 0;
    }
    if(nr4 == 1){
        return verif(g4[0]);
    }
    if(nr3 > 3){
        return 0;
    }
    if(nr3 != 0){
        int nr = 0;
        for(int i = 0; i < nr3; i++){
            nr += verif(g3[i]);
            int nod = g3[i];
            for(int j = 0; j < v[nod].size(); j++){
                if(frst[ v[nod][j] ] == nod && g[ v[nod][j] ] < 3){
                    nr += verif(v[nod][j]);
                }
            }
        }
        return nr;
    }
    if(nrcomp > 1){
        return 0;
    }
    if(nrcomp == 1){
        return num;
    }
    return n;
}

Compilation message

rings.cpp: In function 'void upd(int)':
rings.cpp:73:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i = 0; i < v[nod].size(); i++){
                        ~~^~~~~~~~~~~~~~~
rings.cpp: In function 'int verif(int)':
rings.cpp:87:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < v[nod].size(); i++){
                    ~~^~~~~~~~~~~~~~~
rings.cpp:83:9: warning: unused variable 'i' [-Wunused-variable]
     int i, n3 = 0;
         ^
rings.cpp: In function 'void dfs(int, int)':
rings.cpp:110:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < v[nod].size(); i++){
                    ~~^~~~~~~~~~~~~~~
rings.cpp: In function 'int CountCritical()':
rings.cpp:186:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(int j = 0; j < v[nod].size(); j++){
                            ~~^~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 23936 KB Output is correct
2 Correct 20 ms 24576 KB Output is correct
3 Correct 16 ms 24576 KB Output is correct
4 Correct 13 ms 24064 KB Output is correct
5 Correct 14 ms 24448 KB Output is correct
6 Correct 15 ms 24704 KB Output is correct
7 Correct 13 ms 24500 KB Output is correct
8 Correct 14 ms 24576 KB Output is correct
9 Correct 18 ms 24704 KB Output is correct
10 Correct 16 ms 24704 KB Output is correct

Subtask #2
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 425 ms 87172 KB Output is correct
2 Correct 1235 ms 120952 KB Output is correct
3 Execution timed out 4074 ms 144884 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 23936 KB Output is correct
2 Correct 20 ms 24576 KB Output is correct
3 Correct 16 ms 24576 KB Output is correct
4 Correct 13 ms 24064 KB Output is correct
5 Correct 14 ms 24448 KB Output is correct
6 Correct 15 ms 24704 KB Output is correct
7 Correct 13 ms 24500 KB Output is correct
8 Correct 14 ms 24576 KB Output is correct
9 Correct 18 ms 24704 KB Output is correct
10 Correct 16 ms 24704 KB Output is correct
11 Correct 15 ms 24704 KB Output is correct
12 Correct 20 ms 25472 KB Output is correct
13 Correct 20 ms 25344 KB Output is correct
14 Correct 18 ms 25216 KB Output is correct
15 Correct 20 ms 26112 KB Output is correct
16 Correct 18 ms 25344 KB Output is correct
17 Correct 22 ms 25344 KB Output is correct
18 Correct 23 ms 26368 KB Output is correct
19 Correct 18 ms 25344 KB Output is correct
20 Correct 20 ms 25344 KB Output is correct

Subtask #4
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 23936 KB Output is correct
2 Correct 20 ms 24576 KB Output is correct
3 Correct 16 ms 24576 KB Output is correct
4 Correct 13 ms 24064 KB Output is correct
5 Correct 14 ms 24448 KB Output is correct
6 Correct 15 ms 24704 KB Output is correct
7 Correct 13 ms 24500 KB Output is correct
8 Correct 14 ms 24576 KB Output is correct
9 Correct 18 ms 24704 KB Output is correct
10 Correct 16 ms 24704 KB Output is correct
11 Correct 15 ms 24704 KB Output is correct
12 Correct 20 ms 25472 KB Output is correct
13 Correct 20 ms 25344 KB Output is correct
14 Correct 18 ms 25216 KB Output is correct
15 Correct 20 ms 26112 KB Output is correct
16 Correct 18 ms 25344 KB Output is correct
17 Correct 22 ms 25344 KB Output is correct
18 Correct 23 ms 26368 KB Output is correct
19 Correct 18 ms 25344 KB Output is correct
20 Correct 20 ms 25344 KB Output is correct
21 Correct 35 ms 29432 KB Output is correct
22 Correct 51 ms 32504 KB Output is correct
23 Correct 56 ms 34680 KB Output is correct
24 Correct 1183 ms 34544 KB Output is correct
25 Correct 350 ms 33400 KB Output is correct
26 Correct 68 ms 34940 KB Output is correct
27 Correct 72 ms 34424 KB Output is correct
28 Correct 145 ms 35192 KB Output is correct
29 Correct 71 ms 34552 KB Output is correct
30 Correct 86 ms 37240 KB Output is correct

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 23936 KB Output is correct
2 Correct 20 ms 24576 KB Output is correct
3 Correct 16 ms 24576 KB Output is correct
4 Correct 13 ms 24064 KB Output is correct
5 Correct 14 ms 24448 KB Output is correct
6 Correct 15 ms 24704 KB Output is correct
7 Correct 13 ms 24500 KB Output is correct
8 Correct 14 ms 24576 KB Output is correct
9 Correct 18 ms 24704 KB Output is correct
10 Correct 16 ms 24704 KB Output is correct
11 Correct 425 ms 87172 KB Output is correct
12 Correct 1235 ms 120952 KB Output is correct
13 Execution timed out 4074 ms 144884 KB Time limit exceeded
14 Halted 0 ms 0 KB -