oj.uz

Submission #31542

# Submission time Handle Problem Language Result Execution time Memory
31542 2017-08-29T08:00:31 Z ngkan146 Senior Postmen (BOI14_postmen) C++
0 / 100
 5 ms 384 KB 
#include <bits/stdc++.h>
using namespace std;
int ctrl[500005];
int nxt[500005], prv[500005], id[1000005];
int head[500005], en[500005];
bool visited[1000005];
int n,m;
int euler[1000005], eulersize;
int q[1000005], qsize;
void dfs(){
    q[qsize++] = 1;
    while(qsize){
        int u = q[qsize-1];
        bool mjk = 0;
        for(;ctrl[u];ctrl[u] = nxt[ctrl[u]]){
            int v = (u ^ head[id[ctrl[u]]] ^ en[id[ctrl[u]]]);
            //cout << "v " << v << ' ' << ctrl[u] << ' ' << head[ctrl[u]] << ' ' << en[ctrl[u]] << endl;
            if (visited[id[ctrl[u]]]) continue;
            mjk = 1;
            visited[id[ctrl[u]]] = 1;
            q[qsize++] = v;
            break;
        }

        if(mjk) continue;

        euler[eulersize++] = u;
        --qsize;
    }
}
int st[1000005], stsize;
bool used[1000005];
int main(){
    scanf("%d %d",&n,&m);
    int cnt = 0;
    for(int i=1;i<=m;++i){
        int x,y;
        scanf("%d %d",&x,&y);

        nxt[prv[x]] = ++cnt, id[cnt] = i;
        nxt[prv[y]] = ++cnt, id[cnt] = i;

        if (!ctrl[x]) ctrl[x] = nxt[prv[x]];
        if (!ctrl[y]) ctrl[y] = nxt[prv[y]];

        prv[x] = nxt[prv[x]];
        prv[y] = nxt[prv[y]];



        head[i] = x;
        en[i] = y;

    }

    dfs();

    for(int i=0;i<eulersize;++i){
        if (used[euler[i]]){
            while(st[stsize-1] != euler[i]){
                printf("%d ",st[stsize-1]);
                used[st[stsize-1]] = 0;
                --stsize;
            };
            printf("%d\n",euler[i]);
        }
        else{
            st[stsize++] = euler[i];
            used[euler[i]] = 1;
        }
    }
}

Compilation message

postmen.cpp: In function 'int main()':
postmen.cpp:34:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&n,&m);
     ~~~~~^~~~~~~~~~~~~~~
postmen.cpp:38:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d",&x,&y);
         ~~~~~^~~~~~~~~~~~~~~

Subtask #1
0 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 360 KB Output is correct
2 Incorrect 5 ms 384 KB Edge does not exist or used 1, 7
3 Halted 0 ms 0 KB -

Subtask #2
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Incorrect 5 ms 384 KB Edge does not exist or used 1, 7
3 Halted 0 ms 0 KB -

Subtask #3
0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Incorrect 5 ms 384 KB Edge does not exist or used 1, 7
3 Halted 0 ms 0 KB -