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답안 #331316

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
331316 2020-11-28T02:19:57 Z ec1117 경주 (Race) (IOI11_race) C++17
21 / 100
 1166 ms 262148 KB 
#include "bits/stdc++.h"
#include "race.h"
 // 
using namespace std;
 
typedef long long ll;
typedef long double ld;
typedef double db;
typedef string str; 
 
typedef pair<int,int> pi;
typedef pair<pi, int> pii;
typedef pair<ll,ll> pl; 
typedef pair<db,db> pd; 
 
typedef vector<int> vi; 
typedef vector<bool> vb; 
typedef vector<ll> vl; 
typedef vector<db> vd; 
typedef vector<str> vs; 
typedef vector<pi> vpi;
typedef vector<pl> vpl; 
typedef vector<pd> vpd; 
template<class T> using V = vector<T>; 
template<class T, size_t SZ> using AR = array<T,SZ>; 
 
#define mp make_pair
#define f first
#define s second
#define sz(x) (int)(x).size()
#define all(x) begin(x), end(x)
#define rall(x) (x).rbegin(), (x).rend() 
#define sor(x) sort(all(x)) 
#define rsz resize
#define ins insert 
#define ft front() 
#define bk back()
#define pf push_front 
#define pb push_back
#define eb emplace_back 
#define lb lower_bound 
#define ub upper_bound 
 
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define For(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define Rof(i,a) ROF(i,0,a)
#define trav(a,x) for (auto& a: x)
 
template<class T> bool ckmin(T& a, const T& b) { 
        return b < a ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { 
        return a < b ? a = b, 1 : 0; } 
constexpr int pct(int x) { return __builtin_popcount(x); } 
constexpr int bits(int x) { return 31-__builtin_clz(x); } // floor(log2(x)) 
ll cdiv(ll a, ll b) { return a/b+((a^b)>0&&a%b); } // divide a by b rounded up
ll fdiv(ll a, ll b) { return a/b-((a^b)<0&&a%b); } // divide a by b rounded down
ll half(ll x) { return fdiv(x,2); }
 
template<class T, class U> T fstTrue(T lo, T hi, U f) { 
        // note: if (lo+hi)/2 is used instead of half(lo+hi) then this will loop infinitely when lo=hi
        hi ++; assert(lo <= hi); // assuming f is increasing
        while (lo < hi) { // find first index such that f is true 
                T mid = half(lo+hi);
                f(mid) ? hi = mid : lo = mid+1; 
        } 
        return lo;
}
template<class T, class U> T lstTrue(T lo, T hi, U f) {
        lo --; assert(lo <= hi); // assuming f is decreasing
        while (lo < hi) { // find first index such that f is true 
                T mid = half(lo+hi+1);
                f(mid) ? lo = mid : hi = mid-1;
        } 
        return lo;
}
template<class T> void remDup(vector<T>& v) { 
        sort(all(v)); v.erase(unique(all(v)),end(v)); }
 
// INPUT
template<class A> void re(complex<A>& c);
template<class A, class B> void re(pair<A,B>& p);
template<class A> void re(vector<A>& v);
template<class A, size_t SZ> void re(array<A,SZ>& a);
 
template<class T> void re(T& x) { cin >> x; }
void re(db& d) { str t; re(t); d = stod(t); }
void re(ld& d) { str t; re(t); d = stold(t); }
template<class H, class... T> void re(H& h, T&... t) { re(h); re(t...); }
 
template<class A> void re(complex<A>& c) { A a,b; re(a,b); c = {a,b}; }
template<class A, class B> void re(pair<A,B>& p) { re(p.f,p.s); }
template<class A> void re(vector<A>& x) { trav(a,x) re(a); }
template<class A, size_t SZ> void re(array<A,SZ>& x) { trav(a,x) re(a); }
 
// TO_STRING
#define ts to_string
str ts(char c) { return str(1,c); }
str ts(const char* s) { return (str)s; }
str ts(str s) { return s; }
str ts(bool b) { 
        #ifdef LOCAL
                return b ? "true" : "false"; 
        #else 
                return ts((int)b);
        #endif
}
template<class A> str ts(complex<A> c) { 
        stringstream ss; ss << c; return ss.str(); }
str ts(vector<bool> v) {
        str res = "{"; F0R(i,sz(v)) res += char('0'+v[i]);
        res += "}"; return res; }
template<size_t SZ> str ts(bitset<SZ> b) {
        str res = ""; F0R(i,SZ) res += char('0'+b[i]);
        return res; }
template<class A, class B> str ts(pair<A,B> p);
template<class T> str ts(T v) { // containers with begin(), end()
        #ifdef LOCAL
                bool fst = 1; str res = "{";
                for (const auto& x: v) {
                        if (!fst) res += ", ";
                        fst = 0; res += ts(x);
                }
                res += "}"; return res;
        #else
                bool fst = 1; str res = "";
                for (const auto& x: v) {
                        if (!fst) res += " ";
                        fst = 0; res += ts(x);
                }
                return res;
 
        #endif
}
template<class A, class B> str ts(pair<A,B> p) {
        #ifdef LOCAL
                return "("+ts(p.f)+", "+ts(p.s)+")"; 
        #else
                return ts(p.f)+" "+ts(p.s);
        #endif
}
 
// OUTPUT
template<class A> void pr(A x) { cout << ts(x); }
template<class H, class... T> void pr(const H& h, const T&... t) { 
        pr(h); pr(t...); }
void ps() { pr("\n"); } // print w/ spaces
template<class H, class... T> void ps(const H& h, const T&... t) { 
        pr(h); if (sizeof...(t)) pr(" "); ps(t...); }
 
// DEBUG
void DBG() { cerr << "]" << endl; }
template<class H, class... T> void DBG(H h, T... t) {
        cerr << ts(h); if (sizeof...(t)) cerr << ", ";
        DBG(t...); }
#ifdef LOCAL // compile with -DLOCAL, chk -> fake assert
        #define dbg(...) cerr << "Line(" << __LINE__ << ") -> [" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__)
        #define chk(...) if (!(__VA_ARGS__)) cerr << "Line(" << __LINE__ << ") -> function(" \
                 << __FUNCTION__  << ") -> CHK FAILED: (" << #__VA_ARGS__ << ")" << "\n", exit(0);
#else
        #define dbg(...) 0
        #define chk(...) 0
#endif
 
int gcd(int a, int b) {if (b == 0)return a;return gcd(b, a % b);}
int max(int a,int b, int c){return max(a,max(b,c));}
int min(int a,int b, int c){return min(a,min(b,c));}
ll max(ll a,ll b, ll c){return max(a,max(b,c));}
ll min(ll a,ll b, ll c){return min(a,min(b,c));}
void dbga(int arr[], int n){vi v;For(i,n)v.pb(arr[i]);dbg(v);}
void dbga(ll arr[], int n){vi v;For(i,n)v.pb(arr[i]);dbg(v);}
 
// FILE I/O
void setIn(str s) { freopen(s.c_str(),"r",stdin); }
void setOut(str s) { freopen(s.c_str(),"w",stdout); }
void unsyncIO() { cin.tie(0)->sync_with_stdio(0); }
void setIO(str s = "") {
        unsyncIO();
        // cin.exceptions(cin.failbit); 
        // throws exception when do smth illegal
        // ex. try to read letter into int
        if (sz(s)) { setIn(s+".in"), setOut(s+".out"); } // for USACO
}
// 576743 29995400689069LL
const int MOD = 1e9+7; // 998244353;
const int MX = 2e5+5;
const ll INF = 1e18;
const ld PI = acos((ld)-1);
const int xd[4] = {1,0,-1,0}, yd[4] = {0,1,0,-1};
mt19937 rng((uint32_t)chrono::steady_clock::now().time_since_epoch().count());
 
int k, sub[MX];
ll mn=MOD;
set<pi> adj[MX];
vpl d;
map<ll,ll> b[MX];
 
 
void dfs1(int n, int p){
    sub[n]=1;
    trav(x,adj[n]){
        if(x.f==p)continue;
        dfs1(x.f,n);
        sub[n]+=sub[x.f];
    }
}
 
int centroid(int n, int p, int tot){//is this right?
    trav(x,adj[n]){
        if(x.f==p)continue;
        if(sub[x.f]*2>tot)return centroid(x.f,n,tot);
    }
    return n;
}
 
void dfs2(int n, int p, ll ne, ll dist, int c){
    if(dist==k)ckmin(mn,ne);
    if(b[c][k-dist])ckmin(mn,ne+b[c][k-dist]);
    d.pb(mp(dist,ne));
    trav(x,adj[n]){
        if(x.f==p)continue;
        dfs2(x.f,n,ne+1,dist+x.s,c);
    }
}
 
void solve(int n){
    dfs1(n,n);
    int c=centroid(n,n,sub[n]);
    dbg(n,c);
    trav(x,adj[c]){
        d.clear();
        dfs2(x.f,c,1,x.s,c);
        dbg(x,d,c);
        trav(y,d){
            if(b[c][y.f])ckmin(b[c][y.f],y.s);
            else b[c][y.f]=y.s;
        }
    }
    trav(x,adj[c]){
        pi tmp=*adj[x.f].lb(mp(c,0));
        assert(tmp.f==c);
        adj[x.f].erase(tmp);
        solve(x.f);
    }
}
 
int best_path(int n, int K, int h[][2],int l[]){
    k=K;
    For(i,n-1){
        adj[h[i][0]].ins(mp(h[i][1],l[i]));
        adj[h[i][1]].ins(mp(h[i][0],l[i]));
    }
 
    solve(0);
    if(mn==MOD)return -1;
    else return mn;
 
}

// int main(){
//     int h[3][2];
//     h[0][0]=0;h[0][1]=1;
//     h[1][0]=1;h[1][1]=2;
//     h[2][0]=1;h[2][1]=3;
//     int l[3]={1,2,4};
//     ps(best_path(4,3,h,l));
// }
//psums, bsearch, two pointers
/* stuff you should look for
        * int overflow, array bounds
        * special cases (n=1?)
        * think of simple solution first
        * do smth instead of nothing and stay organized
        * WRITE STUFF DOWN
        * DON'T GET STUCK ON ONE APPROACH
*/
 
// int centroid(int x) {
//     dfs(x,-1); 
//     for (int sz = sub[x];;) {
//         pi mx = {0,0};
//         trav(y,adj[x]) if (!done[y] && sub[y] < sub[x]) 
//             ckmax(mx,{sub[y],y});
//         if (mx.f*2 <= sz) return x; 
//         x = mx.s;
//     }
// }

Compilation message

race.cpp: In function 'void dbga(int*, int)':
race.cpp:163:26: warning: statement has no effect [-Wunused-value]
  163 |         #define dbg(...) 0
      |                          ^
race.cpp:172:55: note: in expansion of macro 'dbg'
  172 | void dbga(int arr[], int n){vi v;For(i,n)v.pb(arr[i]);dbg(v);}
      |                                                       ^~~
race.cpp: In function 'void dbga(ll*, int)':
race.cpp:163:26: warning: statement has no effect [-Wunused-value]
  163 |         #define dbg(...) 0
      |                          ^
race.cpp:173:54: note: in expansion of macro 'dbg'
  173 | void dbga(ll arr[], int n){vi v;For(i,n)v.pb(arr[i]);dbg(v);}
      |                                                      ^~~
race.cpp: In function 'void solve(int)':
race.cpp:163:26: warning: statement has no effect [-Wunused-value]
  163 |         #define dbg(...) 0
      |                          ^
race.cpp:231:5: note: in expansion of macro 'dbg'
  231 |     dbg(n,c);
      |     ^~~
race.cpp:163:26: warning: statement has no effect [-Wunused-value]
  163 |         #define dbg(...) 0
      |                          ^
race.cpp:235:9: note: in expansion of macro 'dbg'
  235 |         dbg(x,d,c);
      |         ^~~
race.cpp: In function 'void setIn(str)':
race.cpp:176:28: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  176 | void setIn(str s) { freopen(s.c_str(),"r",stdin); }
      |                     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
race.cpp: In function 'void setOut(str)':
race.cpp:177:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  177 | void setOut(str s) { freopen(s.c_str(),"w",stdout); }
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 19180 KB Output is correct
2 Correct 13 ms 19180 KB Output is correct
3 Correct 13 ms 19180 KB Output is correct
4 Correct 13 ms 19180 KB Output is correct
5 Correct 13 ms 19180 KB Output is correct
6 Correct 13 ms 19180 KB Output is correct
7 Correct 13 ms 19180 KB Output is correct
8 Correct 13 ms 19180 KB Output is correct
9 Correct 15 ms 19308 KB Output is correct
10 Correct 13 ms 19180 KB Output is correct
11 Correct 14 ms 19180 KB Output is correct
12 Correct 14 ms 19180 KB Output is correct
13 Correct 13 ms 19180 KB Output is correct
14 Correct 13 ms 19200 KB Output is correct
15 Correct 13 ms 19192 KB Output is correct
16 Correct 16 ms 19180 KB Output is correct
17 Correct 13 ms 19180 KB Output is correct
18 Correct 15 ms 19180 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 19180 KB Output is correct
2 Correct 13 ms 19180 KB Output is correct
3 Correct 13 ms 19180 KB Output is correct
4 Correct 13 ms 19180 KB Output is correct
5 Correct 13 ms 19180 KB Output is correct
6 Correct 13 ms 19180 KB Output is correct
7 Correct 13 ms 19180 KB Output is correct
8 Correct 13 ms 19180 KB Output is correct
9 Correct 15 ms 19308 KB Output is correct
10 Correct 13 ms 19180 KB Output is correct
11 Correct 14 ms 19180 KB Output is correct
12 Correct 14 ms 19180 KB Output is correct
13 Correct 13 ms 19180 KB Output is correct
14 Correct 13 ms 19200 KB Output is correct
15 Correct 13 ms 19192 KB Output is correct
16 Correct 16 ms 19180 KB Output is correct
17 Correct 13 ms 19180 KB Output is correct
18 Correct 15 ms 19180 KB Output is correct
19 Correct 13 ms 19180 KB Output is correct
20 Correct 13 ms 19180 KB Output is correct
21 Correct 16 ms 19692 KB Output is correct
22 Correct 16 ms 19948 KB Output is correct
23 Correct 17 ms 19968 KB Output is correct
24 Correct 16 ms 19820 KB Output is correct
25 Correct 16 ms 19820 KB Output is correct
26 Correct 18 ms 19948 KB Output is correct
27 Correct 14 ms 19308 KB Output is correct
28 Correct 20 ms 19820 KB Output is correct
29 Correct 18 ms 19820 KB Output is correct
30 Correct 18 ms 19948 KB Output is correct
31 Correct 16 ms 19820 KB Output is correct
32 Correct 16 ms 19968 KB Output is correct
33 Correct 16 ms 19948 KB Output is correct
34 Correct 21 ms 20076 KB Output is correct
35 Correct 16 ms 19948 KB Output is correct
36 Correct 16 ms 19948 KB Output is correct
37 Correct 16 ms 19948 KB Output is correct
38 Correct 16 ms 19948 KB Output is correct

Subtask #3
0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 19180 KB Output is correct
2 Correct 13 ms 19180 KB Output is correct
3 Correct 13 ms 19180 KB Output is correct
4 Correct 13 ms 19180 KB Output is correct
5 Correct 13 ms 19180 KB Output is correct
6 Correct 13 ms 19180 KB Output is correct
7 Correct 13 ms 19180 KB Output is correct
8 Correct 13 ms 19180 KB Output is correct
9 Correct 15 ms 19308 KB Output is correct
10 Correct 13 ms 19180 KB Output is correct
11 Correct 14 ms 19180 KB Output is correct
12 Correct 14 ms 19180 KB Output is correct
13 Correct 13 ms 19180 KB Output is correct
14 Correct 13 ms 19200 KB Output is correct
15 Correct 13 ms 19192 KB Output is correct
16 Correct 16 ms 19180 KB Output is correct
17 Correct 13 ms 19180 KB Output is correct
18 Correct 15 ms 19180 KB Output is correct
19 Correct 476 ms 64104 KB Output is correct
20 Correct 460 ms 64224 KB Output is correct
21 Correct 522 ms 62404 KB Output is correct
22 Correct 473 ms 59744 KB Output is correct
23 Correct 655 ms 116832 KB Output is correct
24 Correct 310 ms 58376 KB Output is correct
25 Correct 426 ms 55264 KB Output is correct
26 Correct 171 ms 44768 KB Output is correct
27 Correct 651 ms 123884 KB Output is correct
28 Runtime error 1166 ms 262148 KB Execution killed with signal 9 (could be triggered by violating memory limits)
29 Halted 0 ms 0 KB -

Subtask #4
0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 19180 KB Output is correct
2 Correct 13 ms 19180 KB Output is correct
3 Correct 13 ms 19180 KB Output is correct
4 Correct 13 ms 19180 KB Output is correct
5 Correct 13 ms 19180 KB Output is correct
6 Correct 13 ms 19180 KB Output is correct
7 Correct 13 ms 19180 KB Output is correct
8 Correct 13 ms 19180 KB Output is correct
9 Correct 15 ms 19308 KB Output is correct
10 Correct 13 ms 19180 KB Output is correct
11 Correct 14 ms 19180 KB Output is correct
12 Correct 14 ms 19180 KB Output is correct
13 Correct 13 ms 19180 KB Output is correct
14 Correct 13 ms 19200 KB Output is correct
15 Correct 13 ms 19192 KB Output is correct
16 Correct 16 ms 19180 KB Output is correct
17 Correct 13 ms 19180 KB Output is correct
18 Correct 15 ms 19180 KB Output is correct
19 Correct 13 ms 19180 KB Output is correct
20 Correct 13 ms 19180 KB Output is correct
21 Correct 16 ms 19692 KB Output is correct
22 Correct 16 ms 19948 KB Output is correct
23 Correct 17 ms 19968 KB Output is correct
24 Correct 16 ms 19820 KB Output is correct
25 Correct 16 ms 19820 KB Output is correct
26 Correct 18 ms 19948 KB Output is correct
27 Correct 14 ms 19308 KB Output is correct
28 Correct 20 ms 19820 KB Output is correct
29 Correct 18 ms 19820 KB Output is correct
30 Correct 18 ms 19948 KB Output is correct
31 Correct 16 ms 19820 KB Output is correct
32 Correct 16 ms 19968 KB Output is correct
33 Correct 16 ms 19948 KB Output is correct
34 Correct 21 ms 20076 KB Output is correct
35 Correct 16 ms 19948 KB Output is correct
36 Correct 16 ms 19948 KB Output is correct
37 Correct 16 ms 19948 KB Output is correct
38 Correct 16 ms 19948 KB Output is correct
39 Correct 476 ms 64104 KB Output is correct
40 Correct 460 ms 64224 KB Output is correct
41 Correct 522 ms 62404 KB Output is correct
42 Correct 473 ms 59744 KB Output is correct
43 Correct 655 ms 116832 KB Output is correct
44 Correct 310 ms 58376 KB Output is correct
45 Correct 426 ms 55264 KB Output is correct
46 Correct 171 ms 44768 KB Output is correct
47 Correct 651 ms 123884 KB Output is correct
48 Runtime error 1166 ms 262148 KB Execution killed with signal 9 (could be triggered by violating memory limits)
49 Halted 0 ms 0 KB -