Submission #391830

#TimeUsernameProblemLanguageResultExecution timeMemory
391830Kevin_Zhang_TW007 (CEOI14_007)C++17
30 / 100
286 ms17508 KiB
#include <bits/stdc++.h> using namespace std; using ll = long long; #define pb emplace_back #define AI(i) begin(i), end(i) template<class T> bool chmin(T &a, T b) { return b < a && (a = b, true); } template<class T> bool chmax(T &a, T b) { return a < b && (a = b, true); } #ifdef KEV #define DE(args...) kout("[ " + string(#args) + " ] = ", args) void kout() { cerr << endl; } template<class T, class ...U> void kout(T a, U ...b) { cerr << a << ' ', kout(b...); } template<class T> void debug(T l, T r) { while (l != r) cerr << *l << " \n"[next(l)==r], ++l; } #else #define DE(...) 0 #define debug(...) 0 #endif const int MAX_N = 200010, inf = 1e9; int n, m, s, d, A, B; vector<int> edge[MAX_N]; int diss[MAX_N], disd[MAX_N], disa[MAX_N], disb[MAX_N]; void get_dis(int s, int *dis) { fill(dis, dis + n + 1, inf); queue<int> q; q.emplace(s); dis[s] = 0; while (q.size()) { int x = q.front(); q.pop(); for (int u : edge[x]) if (chmin(dis[u], dis[x] + 1)) q.emplace(u); } } bool valid(int rest) { auto test = [&](int x) { int art = diss[x] + rest; int ga = art + disa[x], gb = art + disb[x]; if (max(disa[x], disb[x]) > 1) return false; int da = disd[A], db = disd[B]; if (min(disa[x], disb[x]) == 1) { if (art <= min(da, db)) return true; return false; } if (ga <= da && gb <= db) return true; return false; }; for (int i = 1;i <= n;++i) if (test(i)) return true; return false; } int32_t main() { ios_base::sync_with_stdio(0), cin.tie(0); cin >> n >> m >> s >> d >> A >> B; for (int a, b, i = 0;i < m;++i) { cin >> a >> b; DE(a, b); edge[a].pb(b), edge[b].pb(a); } get_dis(s, diss), get_dis(d, disd); get_dis(A, disa), get_dis(B, disb); if (!valid(0)) return puts("-1"), 0; int l = 0, r = n, mid; while (l < r) { mid = l + r >> 1; if (valid(mid+1)) l = mid + 1; else r = mid; } cout << l << '\n'; }

Compilation message (stderr)

007.cpp: In function 'int32_t main()':
007.cpp:14:17: warning: statement has no effect [-Wunused-value]
   14 | #define DE(...) 0
      |                 ^
007.cpp:66:3: note: in expansion of macro 'DE'
   66 |   DE(a, b);
      |   ^~
007.cpp:76:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   76 |   mid = l + r >> 1;
      |         ~~^~~
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