Submission #287573

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
287573	2020-08-31 20:13:23	DanerZein	Sky Walking (IOI19_walk)	C++14	10 / 100	4067 ms	312512 KiB

walk

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#include <bits/stdc++.h>
#include "walk.h"
#define msize 1023437
#define MAX 9223372036854775806
using namespace std;
typedef long long ll;
typedef pair<ll,ll> ii;
typedef vector<ii> vi;
ll dist[msize];
ll isq[msize];
vector<vi> G;
void dijktra(ll u){
  memset(isq,0,sizeof isq);
  for(int i=0;i<=msize;i++){
    dist[i]=MAX;
  }
  priority_queue<ii,vi,greater<ii> > pq;
  dist[u]=0;
  isq[u]=1;
  pq.push(ii(0,u));
  while(!pq.empty()){
    ll x=pq.top().second;
    ll di=pq.top().first;
    pq.pop();
    isq[x]=0;
    // if(di>dist[x]) continue;
    for(auto &v:G[x]){
      ll w=v.first;
      if(dist[v.second]>dist[x]+w){
  dist[v.second]=dist[x]+w;
 
 
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Compilation message (stderr)

walk.cpp: In function 'void dijktra(ll)':
walk.cpp:23:8: warning: unused variable 'di' [-Wunused-variable]
   23 |     ll di=pq.top().first;
      |        ^~
walk.cpp: In function 'long long int min_distance(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, int, int)':
walk.cpp:45:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |   for(int i=0;i<y.size();i++){
      |               ~^~~~~~~~~
walk.cpp:80:16: 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]
   80 |   for(int i=1;i<aux.size();i++){
      |               ~^~~~~~~~~~~
walk.cpp: In function 'void dijktra(ll)':
walk.cpp:15:12: warning: iteration 1023437 invokes undefined behavior [-Waggressive-loop-optimizations]
   15 |     dist[i]=MAX;
      |            ^
walk.cpp:14:16: note: within this loop
   14 |   for(int i=0;i<=msize;i++){
      |                ^
walk.cpp: In function 'long long int min_distance(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, int, int)':
walk.cpp:59:24: warning: 'id' may be used uninitialized in this function [-Wmaybe-uninitialized]
   59 |    ll dis=abs(x[j]-x[id]);
      |                        ^

• Subtask 1: 10 / 10
• Subtask 2: 0 / 14
• Subtask 3: 0 / 15
• Subtask 4: 0 / 18
• Subtask 5: 0 / 43