Submission #972966

#	Time	Username	Problem	Language	Result	Execution time	Memory
972966		RyaroX	Race (IOI11_race)	C++14	Compilation error	0 ms	0 KiB

race

#include <bits/stdc++.h>

#define MAX_N 500000

static int N, K;
static int H[MAX_N][2];
static int L[MAX_N];

using namespace std;

typedef int ll;

vector <pair <ll, ll> > ND[200005];
ll A[200005];

queue <pair <ll, ll> > Q;

ll P, PV;
vector <pair <ll, ll> > NG;

ll find_mp(ll k, ll pk, ll n){
    vector <pair <ll, ll> > PG;
    ll m=0, s=0;
    for (ll i=0; i<ND[k].size(); i++) {
        ll nk = ND[k][i].first;
        if (pk == nk or A[nk]) continue;
        ll v = find_mp(nk, k, n);
        m = max(m, v);
        s += v;
        PG.push_back({nk, v});
    }
    if(pk!=-1){
        m = max(m, n-s-1);
        PG.push_back({pk, n-s-1});
    }
    //cout<<k<<" "<<s<<" "<<m<<"\n";
    if (PV>m) {
        PV = m;
        P = k;
        NG = move(PG);
    }
    return s+1;
}

ll M[1000005];
ll rez = INT_MAX;
vector <pair<ll,ll> > V;

void path(ll id, ll pid, ll v, ll d){
    if(v>=K) return;
    //cout<<id<<" "<<v<<" "<<d<<"\n" ;
    V.push_back({v,d});
    if(M[K-v]!=INT_MAX) rez = min(rez, M[K-v]+d);
    for(ll i=0; i<ND[id].size(); i++){
        ll nid = ND[id][i].first;
        ll nv = ND[id][i].second;
        if(pid == nid or A[nid]) continue;
        path(nid, id, v+nv, d+1);
    }
}

int best_path(int n, int k, int H[][2], int L[]) {
    for(ll i=0;i<n-1;i++){
        ND[H[i][0]].push_back({H[i][1], L[i]});
        ND[H[i][1]].push_back({H[i][0], L[i]});
    }

    Q.push({0, n});

    while (!Q.empty()){
        PV=INT_MAX;
        ll sz = Q.front().second;
        find_mp(Q.front().first, -1, sz);
        Q.pop();
        A[P] = 1;
        for (ll i=0; i<NG.size(); i++){
            if(NG[i].second>1)Q.push({NG[i].first, NG[i].second});
        }

        //cout<<P<<"\n";
        for(ll i=0; i<=K; i++){
            M[i] = INT_MAX;
        }
        M[0]=0;
        for(ll i=0; i<ND[P].size(); i++){
            ll ni = ND[P][i].first;
            ll nv = ND[P][i].second;
            path(ni, -1, nv, 1);
            for(ll j=0; j<V.size(); j++) M[V[j].first]=min(M[V[j].first], V[j].second);
            V.clear();
        }
        //for(ll i=0;i<=K;i++) cout<<(M[i]==INT_MAX?-1:M[i])<<" "; cout<<"\n";
        //cout<<rez<<"\n__________\n";
    }
    return rez==INT_MAX?-1:rez;
}

void read_input()
{
  int i;
  scanf("%d %d",&N,&K);
  //cout<<N<<" "<<K<<"\n";
  for(i=0; i<N-1; i++)
    scanf("%d %d %d",&H[i][0],&H[i][1],&L[i]);
    //cout<<"hello\n";
}

int main()
{
  //freopen("in.txt", "r", stdin);
  int ans;
  read_input();
  ans = best_path(N,K,H,L);
  printf("%d\n", ans);
  return 0;
}

Compilation message (stderr)

race.cpp: In function 'll find_mp(ll, ll, ll)':
race.cpp:26:19: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |     for (ll i=0; i<ND[k].size(); i++) {
      |                  ~^~~~~~~~~~~~~
race.cpp: In function 'void path(ll, ll, ll, ll)':
race.cpp:56:18: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   56 |     for(ll i=0; i<ND[id].size(); i++){
      |                 ~^~~~~~~~~~~~~~
race.cpp: In function 'int best_path(int, int, int (*)[2], int*)':
race.cpp:78:23: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   78 |         for (ll i=0; i<NG.size(); i++){
      |                      ~^~~~~~~~~~
race.cpp:87:22: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   87 |         for(ll i=0; i<ND[P].size(); i++){
      |                     ~^~~~~~~~~~~~~
race.cpp:91:26: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   91 |             for(ll j=0; j<V.size(); j++) M[V[j].first]=min(M[V[j].first], V[j].second);
      |                         ~^~~~~~~~~
race.cpp: In function 'void read_input()':
race.cpp:103:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  103 |   scanf("%d %d",&N,&K);
      |   ~~~~~^~~~~~~~~~~~~~~
race.cpp:106:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  106 |     scanf("%d %d %d",&H[i][0],&H[i][1],&L[i]);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccEaXHYJ.o: in function `read_input()':
race.cpp:(.text+0x50): multiple definition of `read_input()'; /tmp/ccb49vpJ.o:grader.cpp:(.text+0x0): first defined here
/usr/bin/ld: /tmp/ccEaXHYJ.o: in function `main':
race.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccb49vpJ.o:grader.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status