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General

# Author Problem Lang Verdict Time Memory Sent Judged
55703452 Practice:
praveenojha33
601A - 30 GNU C++17 Memory limit exceeded on test 57 249 ms 262144 KB 2019-06-18 09:15:51 2019-06-18 09:15:51

→ Source
/*||>>>> Praveen Ojha <<<<>>>> 18 June 2019 <<<<>>>> 10:54:18 <<<<||*/
// #pragma GCC optimize("Ofast") //(Very Fast but Inaccurate)
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native") //(Small operations in many loops)
// #pragma GCC optimize("unroll-loops")
#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define F first
#define S second
#define mod 1000000007
#define inf 1e18+5
#define sz(x) (int)x.size()
#define PI 3.141592653589793238510
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define __ ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define vi vector<int>
#define vpii vector<pair<int,int> >
#define vvi vector<vector<int> >
#define PRINT_TIME cerr << "Time elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << " s." <<endl;
#define sim template < class c
#define ris return * this
#define dor > debug & operator <<
#define eni(x) sim > typename   enable_if<sizeof dud<c>(0) x 1, debug&>::type operator<<(c i) {
sim > struct rge { c b, e; };
sim > rge<c> range(c i, c j) { return rge<c>{i, j}; }
sim > auto dud(c* x) -> decltype(cerr << *x, 0);
sim > char dud(...);
struct debug {
#ifdef LOCAL
~debug() { cerr << endl; }
eni(!=) cerr << boolalpha << i; ris; }
eni(==) ris << range(begin(i), end(i)); }
sim, class b dor(pair < b, c > d) {
ris << "(" << d.first << ", " << d.second << ")";
}
sim dor(rge<c> d) {
*this << "[";
for (auto it = d.b; it != d.e; ++it)
*this << ", " + 2 * (it == d.b) << *it;
ris << "]";
}
#else
sim dor(const c&) { ris; }
#endif
};
#define imie(...) " [" << #__VA_ARGS__ ": " << (__VA_ARGS__) << "] "
typedef long double ld;
typedef pair<int,int> pii;
//Read Problems Carefully & Check for corner cases N=0,1 ?
///////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////
const int N=500;
int vis[N];
int rr[N][N];
int cnt,n,m;

int bfs1(int uu){
queue <pii> qq;
qq.push({uu,0});
while(!qq.empty()){
pii u=qq.front();
qq.pop();
vis[u.F]=1;
if(u.F==n)
return u.S;
for(int v:rail[u.F]){
if(!vis[v])
qq.push({v,u.S+1});
}
}
return -1;
}
int bfs2(int uu){
queue <pii> qq;
qq.push({uu,0});
while(!qq.empty()){
pii u=qq.front();
qq.pop();
// debug()<< imie(u);
vis[u.F]=1;
if(u.F==n)
return u.S;
if(!vis[v])
qq.push({v,u.S+1});
}
}
return -1;
}
int32_t main(){__
int x,y;
cin>>n>>m;
for(int i=1;i<=m;i++){
cin>>x>>y;
rr[x][y]=rr[y][x]=1;
rail[x].push_back(y);
rail[y].push_back(x);
}
for(int i=1;i<=n;i++){
for(int j=i+1;j<=n;j++){
if(!rr[i][j]){
}
}
}
if(rr[1][n]){
cnt=bfs2(1);
cout<<cnt<<"\n";
}
else{
cnt=bfs1(1);
cout<<cnt<<"\n";
}
return 0;
}

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Time: ? ms, memory: ? KB
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