제출 #371600

#제출 시각아이디문제언어결과실행 시간메모리
371600DymoOlympic Bus (JOI20_ho_t4)C++14
37 / 100
1086 ms14060 KiB
#pragma GCC optimize("Ofast") #pragma GCC optimization("unroll-loops, no-stack-protector") #pragma GCC target("avx,avx2,fma") #include<bits/stdc++.h> using namespace std; #define ll long long #define ull long long #define pll pair<ll,ll> #define ff first #define ss second #define pb push_back //#define endl "\n" const ll maxn =2e5+30; const ll mod=1e9+7 ; const ll base=1e18; ll x[maxn]; ll y[maxn]; ll c[maxn]; ll d[maxn]; vector<ll> adj[maxn][2]; ll dp[maxn][6]; ll pre[maxn]; ll n, m ; bool dd[maxn]; void dosth(ll p,ll type,ll ta,ll rc,ll t) { priority_queue<pll,vector<pll>,greater<pll>> q; for (int i=1; i<=n; i++) { dp[i][type]=base; } dp[p][type]=0; q.push(make_pair(dp[p][type],p)); while (!q.empty()) { auto p=q.top(); q.pop(); ll u=p.ss; if (dp[u][type]!=p.ff) continue; for (auto to:adj[u][ta]) { if (u==rc&&to==t) continue; ll nxt=x[to]+y[to]-u; if (dp[nxt][type]>dp[u][type]+c[to]) { dp[nxt][type]=dp[u][type]+c[to]; q.push(make_pair(dp[nxt][type],nxt)); pre[nxt]=to; } } } } ll ans=base; void dosth1() { dosth(1,0,0,-1,-1); ll nw=n; while (nw!=1) { // cout <<nw<<" "<<pre[nw]<<endl; dd[pre[nw]]=1; // cout <<pre[nw]<<endl; nw=x[pre[nw]]+y[pre[nw]]-nw; } dosth(1,1,1,-1,-1); dosth(n,2,0,-1,-1); dosth(n,3,1,-1,-1); ans=min(ans,dp[n][0]+dp[n][1]); for (int i=1; i<=m; i++) { if (dd[i]) { ll h1=x[i]; ll h2=y[i]; adj[h2][0].pb(i); swap(x[i],y[i]); dosth(1,4,0,h1,i); ll h=dp[n][4]+d[i]; dosth(n,4,0,h1,i); h+=dp[1][4]; swap(x[i],y[i]); adj[h2][0].pop_back(); ans=min(ans,h); } else { ans=min(ans,dp[n][0]+dp[x[i]][1]+dp[y[i]][2]+c[i]+d[i]); /* if (i==2) { cout <<min(dp[n][0],dp[y[i]][0]+dp[x[i]][3]+c[i])+dp[x[i]][1]+dp[y[i]][2]+c[i]+d[i]<<endl; }*/ /* if (min(dp[n][0],dp[y[i]][0]+dp[x[i]][3])+dp[x[i]][1]+dp[y[i]][2]+c[i]+d[i]==1) { cout <<i<<endl; }*/ } } } void change() { for (int i=1; i<=n; i++) { adj[i][0].clear(); adj[i][1].clear(); } for (int i=1; i<=m; i++) { if (x[i]==n) x[i]=1; else if (x[i]==1) x[i]=n; if (y[i]==n) y[i]=1; else if (y[i]==1) y[i]=n; // cout <<x[i]<< " "<<y[i]<<endl; adj[x[i]][0].pb(i); adj[y[i]][1].pb(i); } } int main() { ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0); if (fopen("test.inp","r")) { freopen("test.inp","r",stdin); freopen("test.out","w",stdout); } cin>> n>> m; for (int i=1; i<=m; i++) { cin>>x[i]>> y[i]>>c[i]>> d[i ]; adj[x[i]][0].pb(i); adj[y[i]][1].pb(i); } dosth(1,0,0,-1,-1); dosth(n,1,0,-1,-1); // cout <<dp[n][0]<<" "<<dp[1][1]<<endl; if (dp[n][0]!=base&&dp[1][1]!=base) { // cout <<"?"; dosth1(); change(); dosth1(); if (ans>=base) { ans=-1; } cout <<ans<<endl; } else if (dp[n][0]!=base) { dosth1(); if (ans>=base) { ans=-1; } cout <<ans<<endl; } else if (dp[1][1]!=base) { change(); dosth1(); if (ans>=base) { ans=-1; } cout <<ans<<endl; } else { dosth(1,0,0,-1,-1); dosth(1,1,1,-1,-1); dosth(n,2,0,-1,-1); dosth(n,3,1,-1,-1); ll ans=dp[n][0]+dp[n][1]; for (int i=1; i<=m; i++) { ans=min(ans,dp[y[i]][0]+dp[x[i]][3]+dp[y[i]][2]+dp[x[i]][1]+d[i]+2*c[i]); } if (ans>=base) { ans=-1; } cout <<ans; } }

컴파일 시 표준 에러 (stderr) 메시지

ho_t4.cpp:2: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    2 | #pragma GCC optimization("unroll-loops, no-stack-protector")
      | 
ho_t4.cpp: In function 'int main()':
ho_t4.cpp:139:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  139 |         freopen("test.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
ho_t4.cpp:140:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  140 |         freopen("test.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
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