Submission #1455635

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Source Code Expand

#include <ctime>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cassert>
#include <algorithm>
#include <iostream>
#include <vector>
#include <queue>
#include <stack>
#include <deque>
#include <set>
#include <map>
using namespace std;

typedef long long ll;
typedef double lf;
typedef long double Lf;
typedef pair <int,int> pii;
typedef pair <ll, ll> pll;

#define TRACE(x) cerr << #x << "  " << x << endl
#define FOR(i, a, b) for (int i = (a); i < int(b); i++)
#define REP(i, n) FOR(i, 0, n)
#define all(x) (x).begin(), (x).end()
#define _ << " " <<

#define fi first
#define sec second
#define mp make_pair

int a, b;

map <int, int > bio;

priority_queue <pii> q;

int dijkstra(int x) {
	q.push(mp(0, x));

	int cvor;
	int d;

	while (!q.empty()) {
		while (!q.empty() && bio[q.top().sec]) q.pop();
		
		cvor = q.top().sec;
		d = -q.top().fi;
		q.pop();
		bio[cvor] = 1;

		if (cvor == b) return d;
		if (cvor < b) q.push(mp(-(d + b - cvor), b));
		if (cvor < -b) q.push(mp(-(d -b - cvor), -b));
		q.push(mp(-d -1, -cvor));
	}
	return -1;
}

int main() {
	scanf("%d %d",&a,&b);
	printf("%d\n",dijkstra(a));
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:61:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d",&a,&b);
                      ^

Judge Result