oj.uz

Submission #598823

# Submission time Handle Problem Language Result Execution time Memory
598823 2022-07-19T06:09:47 Z 조영욱(#8459) Potemkin cycle (CEOI15_indcyc) C++17
30 / 100
 742 ms 340 KB 
#include <bits/stdc++.h>
using namespace std;

int n,m;
bool arr[10][10];
int p[10];
int deg[10];

int find(int a) {
    return p[a]<0?a:p[a]=find(p[a]);
}

void merge(int a,int b) {
    a=find(a);
    b=find(b);
    if (a!=b) {
        p[a]+=p[b];
        p[b]=a;
    }
}

int main() {
    scanf("%d %d",&n,&m);
    for(int i=0;i<m;i++) {
        int u,v;
        scanf("%d %d",&u,&v);
        u--;
        v--;
        arr[u][v]=true;
        arr[v][u]=true;
    }
    for(int bit=0;bit<(1<<n);bit++) {
        int sz=0;
        for(int i=0;i<n;i++) {
            if (bit&(1<<i)) {
                sz++;
            }
        }
        if (sz<4) {
            continue;
        }
        int cnt=0;
        memset(p,-1,sizeof(p));
        memset(deg,0,sizeof(deg));
        int f=-1;
        for(int i=0;i<n;i++) {
            if (bit&(1<<i)) {
                if (f==-1) {
                    f=i;
                }
                for(int j=i+1;j<n;j++) {
                    if (bit&(1<<j)) {
                        if (arr[i][j]) {
                            cnt++;
                            merge(i,j);
                            deg[i]++;
                            deg[j]++;
                        }
                    }
                }
            }
        }
        if (-p[find(f)]!=sz||sz!=cnt) {
            continue;
        }
        bool flag=true;
        for(int i=0;i<n;i++) {
            if ((bit&(1<<i))&&deg[i]!=2) {
                flag=false;
                break;
            }
        }
        if (flag) {
            int now=f;
            int pr=-1;
            vector<int> v;
//printf("%d\n",bit);
int save=0;
            while (1) {
//save++;
//if (save>=1000) exit(0);
                v.push_back(now);
                int nt=-1;
                for(int i=0;i<n;i++) {
                    if (bit&(1<<i)) {
                        if (i!=pr&&arr[now][i]) {
                            nt=i;
                            break;
                        }
                    }
                }
                if (nt==f) {
                    break;
                }
                pr=now;
                now=nt;
            }
            for(int i=0;i<v.size();i++) {
                printf("%d ",v[i]+1);
            }
            return 0;
        }
    }
    printf("no");
    return 0;
}

Compilation message

indcyc.cpp: In function 'int main()':
indcyc.cpp:98:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   98 |             for(int i=0;i<v.size();i++) {
      |                         ~^~~~~~~~~
indcyc.cpp:78:5: warning: unused variable 'save' [-Wunused-variable]
   78 | int save=0;
      |     ^~~~
indcyc.cpp:23:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |     scanf("%d %d",&n,&m);
      |     ~~~~~^~~~~~~~~~~~~~~
indcyc.cpp:26:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |         scanf("%d %d",&u,&v);
      |         ~~~~~^~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 35 ms 284 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #5
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 695 ms 276 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 728 ms 272 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 4 ms 340 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 340 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 2 ms 296 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 742 ms 272 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -