Submission #449944

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
449944	2021-08-02 10:08:34	cpp219	Railway (BOI17_railway)	C++14	100 / 100	181 ms	29236 KiB

railway

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#pragma GCC optimization O2
#pragma GCC optimization "unroll-loop"
#pragma target ("avx2")
#include <bits/stdc++.h>
#define ll int
#define ld long double
#define fs first
#define sc second
using namespace std;
typedef pair<ll,ll> LL;
const ll N = 1e5 + 9;
const ll Log2 = 21;
const ll inf = 1e9 + 7;
vector<ll> g[N];
ll n,Q,k,x,y,par[N][Log2],pos[N],child[N],nTime,d[N];
ll tot[N];
void DFS(ll u,ll p){
    child[u] = 1; pos[u] = nTime++;
    for (ll i = 1;i < Log2;i++) if ((1 << i) <= d[u])
        par[u][i] = par[par[u][i - 1]][i - 1];
    for (auto i : g[u]){
        if (i == p) continue;
        d[i] = d[u] + 1; par[i][0] = u;
        DFS(i,u); child[u] += child[i];
    }
}
 
 
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Compilation message (stderr)

railway.cpp:1: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    1 | #pragma GCC optimization O2
      | 
railway.cpp:2: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    2 | #pragma GCC optimization "unroll-loop"
      | 
railway.cpp:3: warning: ignoring '#pragma target ' [-Wunknown-pragmas]
    3 | #pragma target ("avx2")
      | 
railway.cpp: In function 'int main()':
railway.cpp:71:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   71 |         for (ll i = 1;i < v.size();i++){
      |                       ~~^~~~~~~~~~
railway.cpp:57:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   57 |         freopen(task".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 15 / 15
• Subtask 3: 7 / 7
• Subtask 4: 29 / 29
• Subtask 5: 16 / 16
• Subtask 6: 25 / 25