Submission #218286

#TimeUsernameProblemLanguageResultExecution timeMemory
218286summitweiDreaming (IOI13_dreaming)C++17
18 / 100
1087 ms12392 KiB
#include <bits/stdc++.h> #include <dreaming.h> using namespace std; typedef vector<int> vi; typedef vector<pair<int, int> > vpii; typedef pair<int, int> pii; typedef long long ll; typedef pair<ll, ll> pll; typedef pair<double, double> pdd; typedef vector<ll> vll; #define INF 0x3f3f3f3f #define MOD 1000000007LL #define EPSILON 0.00001 #define f first #define s second #define pb push_back #define mp make_pair #define FOR(i, a, b) for (ll i=(a); i<=(signed)(b); i++) #define F0R(i, a) for (ll i=0; i<(signed)(a); i++) #define RFOR(i, a, b) for (ll i=(a); i >= b; i--) #define MN 100005 vpii e[MN]; pii far(int cn, int p){ //{dist, node} pii ans = {0, cn}; for(auto nn : e[cn]) if(nn.f != p){ pii res = far(nn.f, cn); ans = max(ans, {res.f+nn.s, res.s}); } return ans; } int dsu[MN]; int sz[MN]; int ans[MN]; int fd(int x){ if(dsu[x] == x) return x; dsu[x] = fd(dsu[x]); return dsu[x]; } void jn(int x, int y){ x = fd(x); y = fd(y); if(x == y) return; if(sz[x] < sz[y]) swap(x, y); dsu[y] = x; sz[x] += sz[y]; ans[x] = min(ans[x], ans[y]); } int travelTime(int N, int M, int L, int A[], int B[], int T[]){ int n = N; int m = M; int l = L; F0R(i, m){ e[A[i]].pb({B[i], T[i]}); e[B[i]].pb({A[i], T[i]}); } F0R(i, n){ dsu[i] = i; sz[i] = i; pii res = far(i, -1); //cout << "far from " << i << " " << res.f << "\n"; ans[i] = res.f; } F0R(i, m){ jn(A[i], B[i]); } vi hmm; F0R(i, n){ if(dsu[i] == i){ //cout << ans[i] << " "; hmm.pb(ans[i]); } } //cout << "\n"; sort(hmm.begin(), hmm.end(), greater<int>() ); if(hmm.size() == 1){ return hmm[0]; } else if(hmm.size() == 2){ return hmm[0]+hmm[1]+l; } else{ return max(hmm[0]+hmm[1]+l, hmm[1]+hmm[2]+l+l); } } /*int main(){ ios_base::sync_with_stdio(false); cin.tie(0); int N, M, L; cin >> N >> M >> L; int A[M], B[M], T[M]; F0R(i, M) cin >> A[i] >> B[i] >> T[i]; cout << travelTime(N, M, L, A, B, T) << "\n"; return 0; }*/
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