제출 #419626

#제출 시각아이디문제언어결과실행 시간메모리
419626VladM어르신 집배원 (BOI14_postmen)C++14
55 / 100
575 ms124984 KiB
#include <bits/stdc++.h> using namespace std; #define DIM 500007 int u, v, n, m, par[DIM], vis[DIM]; set<int> vec[DIM]; void dfs(int v, int p) { vis[v]=1; par[v]=p; for(auto to : vec[v]) { if(to==p) continue; if(vis[to]==1) { vec[v].erase(to); vec[to].erase(v); while(v!=to) { p=par[v]; printf("%d ", v); vec[v].erase(p); vec[p].erase(v); vis[v]=0; par[v]=0; v=p; } printf("%d\n", v); if(!vec[v].empty()) dfs(v, par[v]); } else dfs(to, v); break; } return; } int main() { scanf("%d%d", &n, &m); for(int i=1; i<=m; i++) { scanf("%d%d", &u, &v); if(vec[v].find(u)!=vec[v].end()) { printf("%d %d\n", u, v); vec[u].erase(v); vec[v].erase(u); } else { vec[u].insert(v); vec[v].insert(u); } } for(int i=1; i<=n; i++) { if(vec[i].size()!=0) { dfs(i, -1); } } return 0; }

컴파일 시 표준 에러 (stderr) 메시지

postmen.cpp: In function 'int main()':
postmen.cpp:43:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |     scanf("%d%d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~
postmen.cpp:46:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |         scanf("%d%d", &u, &v);
      |         ~~~~~^~~~~~~~~~~~~~~~
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