#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include typedef long long ll; using namespace std; #ifndef LOCAL #define debug(x) ; #else #define debug(x) cerr << __LINE__ << " : " << #x << " = " << (x) << endl; template ostream &operator<<(ostream &out, const pair &p) { out << "{" << p.first << ", " << p.second << "}"; return out; } template ostream &operator<<(ostream &out, const vector &v) { out << '{'; for (const T &item : v) out << item << ", "; out << "\b\b}"; return out; } #endif #define mod 1000000007 //1e9+7(prime number) #define INF 1000000000 //1e9 #define LLINF 2000000000000000000LL //2e18 #define SIZE 210 ll dist[SIZE][SIZE]; ll dist_input[SIZE][SIZE]; int main(){ int N, M, S, G; scanf("%d%d%d%d", &N, &M, &S, &G); for(int i=0;i ans; ans.push_back(S); int now = S; while(now != G){ for(int i=0;i