Submission #989745

#	Time	Username	Problem	Language	Result	Execution time	Memory
989745		Mihailo	Cyberland (APIO23_cyberland)	C++17	0 / 100	24 ms	18268 KiB

cyberland

#include "cyberland.h"
#include <cassert>
#include <cstdio>
#include <bits/stdc++.h>
#define pll pair<long long, long long>
#define mp make_pair
#define pb push_back
#define xx first
#define yy second
using namespace std;
typedef long long ll;

vector<pll> adj[100100];
int a[100100], n, ks;
long long dis[100100], rez;

long long dikstra() {
    priority_queue<pll> q;
    pll cur;
    q.push(mp(0, 0));
    for(int i=0; i<=n; i++) dis[i]=-1;
//    cout<<'\n';
    while(q.size()) {
        cur=q.top();
        q.pop();
//        cout<<cur.xx<<' '<<cur.yy<<'\n';
        if(dis[cur.yy]!=-1) continue;
        dis[cur.yy]=-cur.xx;
        for(int i=0; i<adj[cur.yy].size(); i++) {
            if(dis[adj[cur.yy][i].xx]==-1) q.push(mp(cur.xx-adj[cur.yy][i].yy, adj[cur.yy][i].xx));
        }
    }
}

double solve(int N, int M, int K, int H, std::vector<int> x, std::vector<int> y, std::vector<int> c, std::vector<int> arr) {
    for(int i=0; i<M; i++) {
        adj[x[i]+1].pb(mp(y[i]+1, c[i]));
        adj[y[i]+1].pb(mp(x[i]+1, c[i]));
    }
    n=N;
    a[1]=0;
    for(int i=1; i<arr.size(); i++) {
        a[i+1]=arr[i];
    }
    /////////
    adj[0].pb(mp(1, 0));
    dikstra();
    if(dis[H+1]==-1) return -1;
    adj[0].clear();
    /////////
    for(int i=1; i<=N; i++) {
        if(a[i]==0) adj[0].pb(mp(i, 0));
    }
    rez=1e16;
    ks=K;
    K++;
    while(K--) {
        dikstra();
        rez=min(rez, dis[H+1]*(ll)pow(2, K));
        adj[0].clear();
        for(int i=1; i<=N; i++) {
            if(a[i]==2) adj[0].pb(mp(i, 2*dis[i]));
        }
    }
    return ((double)rez)/pow(2, ks);
}

Compilation message (stderr)

cyberland.cpp: In function 'long long int dikstra()':
cyberland.cpp:29:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |         for(int i=0; i<adj[cur.yy].size(); i++) {
      |                      ~^~~~~~~~~~~~~~~~~~~
cyberland.cpp:33:1: warning: no return statement in function returning non-void [-Wreturn-type]
   33 | }
      | ^
cyberland.cpp: In function 'double solve(int, int, int, int, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
cyberland.cpp:42:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |     for(int i=1; i<arr.size(); i++) {
      |                  ~^~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 0 / 13
• Subtask 4: 0 / 19
• Subtask 5: 0 / 7
• Subtask 6: 0 / 16
• Subtask 7: 0 / 29
• Subtask 8: 0 / 3