Submission #39986

#TimeUsernameProblemLanguageResultExecution timeMemory
39986WaschbarSenior Postmen (BOI14_postmen)C++14
55 / 100
548 ms69480 KiB
#include <bits/stdc++.h> #define st first #define nd second using namespace std; const int INF = 1e8; const int MOD = 1e9+7; const int MAXN = 500000; int n, m, t; bool used[MAXN+1], vis[MAXN+1]; vector < vector < int > > ans(MAXN+1); vector < vector < pair<int,int> > > g(MAXN+1); int DFS(int f, int p) { used[f] = 1; for(int i = 0; i < g[f].size(); i++) { int to = g[f][i].first; int num = g[f][i].second; if(to == p || vis[num]) continue; if(used[to]) { vis[num] = 1; used[f] = 0; ans[++t].push_back(f); return to; } else{ int x = DFS(to,f); if(x == -1) continue; vis[num] = 1; ans[t].push_back(f); if(f != x) { used[f] = 0; return x; } } } return -1; } int main() { ios_base::sync_with_stdio(false); cin.tie(0); //freopen("input.txt","r",stdin); //freopen("output.txt","w",stdout); cin >> n >> m; for(int i = 1; i <= m; i++){ int x, y; cin >> x >> y; g[x].push_back({y,i}); g[y].push_back({x,i}); } for(int i = 1; i <= n; i++) DFS(i,0); for(int i = 1; i <= t; i++) { for(int j = 0; j < ans[i].size(); j++) cout << ans[i][j] << " "; cout << "\n"; } }

Compilation message (stderr)

postmen.cpp: In function 'int DFS(int, int)':
postmen.cpp:18:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i = 0; i < g[f].size(); i++) {
                        ~~^~~~~~~~~~~~~
postmen.cpp: In function 'int main()':
postmen.cpp:63:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int j = 0; j < ans[i].size(); j++)
                        ~~^~~~~~~~~~~~~~~
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