Submission #288670

#	Time	Username	Problem	Language	Result	Execution time	Memory
288670		LordOfIran	Senior Postmen (BOI14_postmen)	C++17	100 / 100	330 ms	47612 KiB

postmen

    #include <bits/stdc++.h> 
     
    using namespace std;
     
    #define rep(i , j , k) for (int i = j; i < (int)k; i++)
    #define pb push_back
    typedef vector<int> vi;
     
    constexpr int N = 5e5 + 10;
     
    int n, m, a, b;
     
    int ptr[N];
    bitset<N> mark, mark2;
     
    int shit, to[N << 1], pre[N << 1], last[N << 1], junk[N << 1];
     
    inline void addEdge(int a , int b) {
    	to[shit] = b; pre[shit] = last[a]; last[a] = shit++;
    	to[shit] = a; pre[shit] = last[b]; last[b] = shit++;	
    }
     
    int st[N], R;
    void dfs(int v) {
    	while (last[v] != -1) {
    		int id = last[v];
    		last[v] = pre[id];
    		if (!mark[id / 2]) {
    			mark[id / 2] = true;
    			dfs(to[id]);
    		}
    	}
    	if (mark2[v]) {
    		while (mark2[v]) {
    			printf("%d" , st[R]);
    			if (st[R] == v) printf("\n");
    			else printf(" ");
    			mark2[st[R]] = false;
    			R--;
    		}
    	} 
    	mark2[v] = true;
    	st[++R] = v;
     
    }
     
    int main() {
    	memset(last, -1, sizeof(last));
    	scanf("%d%d" , &n , &m);
    	rep(i , 0 , m) {
    		scanf("%d%d" , &a , &b);
    		addEdge(a , b);
    	}
     
    	dfs(1);
     
    	return 0;
    }

Compilation message (stderr)

postmen.cpp: In function 'int main()':
postmen.cpp:49:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   49 |      scanf("%d%d" , &n , &m);
      |      ~~~~~^~~~~~~~~~~~~~~~~~
postmen.cpp:51:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   51 |       scanf("%d%d" , &a , &b);
      |       ~~~~~^~~~~~~~~~~~~~~~~~

• Subtask 1: 38 / 38
• Subtask 2: 17 / 17
• Subtask 3: 45 / 45