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Submission #248547

# Submission time Handle Problem Language Result Execution time Memory
248547 2020-07-12T17:21:13 Z alexandra_udristoiu Parachute rings (IOI12_rings) C++14
38 / 100
 4000 ms 134752 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){
    while(r[x] > 0){
        x = r[x];
    }
    return x;
}
void uneste(int i, int x, int y){
    if(x == nnod[i] || y == nnod[i]){
        return;
    }
    while(r2[i][x] >= 0){
        x = r2[i][x];
    }
    while(r2[i][y] >= 0){
        y = r2[i][y];
    }
    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){
        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) {
    if(x == 2852 && y == 4988){
        int abc = 0;
    }
    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:56:26: 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:70:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < v[nod].size(); i++){
                    ~~^~~~~~~~~~~~~~~
rings.cpp:66:9: warning: unused variable 'i' [-Wunused-variable]
     int i, n3 = 0;
         ^
rings.cpp: In function 'void dfs(int, int)':
rings.cpp:93:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < v[nod].size(); i++){
                    ~~^~~~~~~~~~~~~~~
rings.cpp: In function 'void Link(int, int)':
rings.cpp:101:13: warning: unused variable 'abc' [-Wunused-variable]
         int abc = 0;
             ^~~
rings.cpp: In function 'int CountCritical()':
rings.cpp:172:30: 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 18 ms 23936 KB Output is correct
2 Correct 15 ms 24576 KB Output is correct
3 Correct 17 ms 24576 KB Output is correct
4 Correct 13 ms 24064 KB Output is correct
5 Correct 17 ms 24416 KB Output is correct
6 Correct 15 ms 24832 KB Output is correct
7 Correct 13 ms 24448 KB Output is correct
8 Correct 15 ms 24576 KB Output is correct
9 Correct 16 ms 24832 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 87032 KB Output is correct
2 Correct 1173 ms 121008 KB Output is correct
3 Execution timed out 4070 ms 134752 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 23936 KB Output is correct
2 Correct 15 ms 24576 KB Output is correct
3 Correct 17 ms 24576 KB Output is correct
4 Correct 13 ms 24064 KB Output is correct
5 Correct 17 ms 24416 KB Output is correct
6 Correct 15 ms 24832 KB Output is correct
7 Correct 13 ms 24448 KB Output is correct
8 Correct 15 ms 24576 KB Output is correct
9 Correct 16 ms 24832 KB Output is correct
10 Correct 16 ms 24704 KB Output is correct
11 Correct 15 ms 24704 KB Output is correct
12 Correct 23 ms 25344 KB Output is correct
13 Correct 25 ms 25344 KB Output is correct
14 Correct 247 ms 25336 KB Output is correct
15 Correct 649 ms 26116 KB Output is correct
16 Correct 23 ms 25344 KB Output is correct
17 Correct 25 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 19 ms 25344 KB Output is correct

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 23936 KB Output is correct
2 Correct 15 ms 24576 KB Output is correct
3 Correct 17 ms 24576 KB Output is correct
4 Correct 13 ms 24064 KB Output is correct
5 Correct 17 ms 24416 KB Output is correct
6 Correct 15 ms 24832 KB Output is correct
7 Correct 13 ms 24448 KB Output is correct
8 Correct 15 ms 24576 KB Output is correct
9 Correct 16 ms 24832 KB Output is correct
10 Correct 16 ms 24704 KB Output is correct
11 Correct 15 ms 24704 KB Output is correct
12 Correct 23 ms 25344 KB Output is correct
13 Correct 25 ms 25344 KB Output is correct
14 Correct 247 ms 25336 KB Output is correct
15 Correct 649 ms 26116 KB Output is correct
16 Correct 23 ms 25344 KB Output is correct
17 Correct 25 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 19 ms 25344 KB Output is correct
21 Correct 35 ms 29312 KB Output is correct
22 Correct 50 ms 32524 KB Output is correct
23 Correct 58 ms 34680 KB Output is correct
24 Execution timed out 4080 ms 33784 KB Time limit exceeded
25 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 23936 KB Output is correct
2 Correct 15 ms 24576 KB Output is correct
3 Correct 17 ms 24576 KB Output is correct
4 Correct 13 ms 24064 KB Output is correct
5 Correct 17 ms 24416 KB Output is correct
6 Correct 15 ms 24832 KB Output is correct
7 Correct 13 ms 24448 KB Output is correct
8 Correct 15 ms 24576 KB Output is correct
9 Correct 16 ms 24832 KB Output is correct
10 Correct 16 ms 24704 KB Output is correct
11 Correct 425 ms 87032 KB Output is correct
12 Correct 1173 ms 121008 KB Output is correct
13 Execution timed out 4070 ms 134752 KB Time limit exceeded
14 Halted 0 ms 0 KB -