Submission #1121283

#	Time	Username	Problem	Language	Result	Execution time	Memory
1121283		smokieboi	007 (CEOI14_007)	C++17	0 / 100	171 ms	23856 KiB

007

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define nl '\n'
#define fu(i,a,b) for(int i=a; i<=b; i++)
#define fd(i,a,b) for(int i=a; i>=b; i--)
#define BIT(i, n) (((n)>>(i))&(1))
#define pii pair<int, int>
#define ff first
#define ss second
#define all(v) v.begin(), v.end()
#define SZ(V) (int)(V.size())
#define pb push_back
#define eb emplace_back
#define NAME "quan"

int t,n,m,k,q;

const int N = 2e5 + 5;
const int MOD = 1e9 + 7;
const int inf = 1e9 + 7;

void add(int &a, int b) {a+=b; if(a>=MOD) a-=MOD;}
void sub(int &a, int b) {a-=b; if(a<0) a+=MOD;}

vector<int> adj[N];
int d[N][2];
int x,y,a,b;
queue<pii> Q;
void nhap(){
    cin >> n >> m;
    cin >> x >> y >> a >> b;
    fu(i,1,m){
        int u,v;
        cin >> u >> v;
        adj[u].eb(v);
        adj[v].eb(u);
    }
    memset(d, -1, sizeof d);
    d[a][0] = 0;
    d[b][1] = 0;
    Q.push({a, 0});
    Q.push({b, 1});
    while(SZ(Q)){
        int u = Q.front().ff;
        int x = Q.front().ss;
        Q.pop();
        for(int v: adj[u])
            if(d[v][x] == -1){
                d[v][x] = d[u][x] + 1;
                Q.push({v, x});
            }
    }
    if(d[y][0] < d[x][0] || d[y][1] < d[x][1]) cout << -1;
    else cout << min(d[y][0] - d[x][0], d[y][1] - d[x][1]);
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    if(fopen(NAME".inp", "r")){
       freopen(NAME".inp", "r", stdin);
       freopen(NAME".out", "w", stdout);
    }
    nhap();
}

Compilation message (stderr)

007.cpp: In function 'int main()':
007.cpp:63:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   63 |        freopen(NAME".inp", "r", stdin);
      |        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
007.cpp:64:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |        freopen(NAME".out", "w", stdout);
      |        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 30
• Subtask 2: 0 / 70