Submission #1037174

#	Time	Username	Problem	Language	Result	Execution time	Memory
1037174		tintingyn21	Robot (JOI21_ho_t4)	C++14	0 / 100	10 ms	47452 KiB

Main

#include <bits/stdc++.h>





using namespace std;


#define task "robot1"
#define ull unsigned long long
#define ll long long
#define double long double
#define For(i, a, b) for (int i = (a), _b = (b); i <= _b; ++i)
#define ForD(i, b, a) for (int i = (b), _a = (a); i >= _a; --i)
#define endl '\n'
#define maxN 1000005
#define fi first
#define se second
#define pb push_back
#define mask(i) (1ll << (i))
#define bit(mask, i) (mask >> i & 1)
#define onBIT(mask, i) (mask | (1ll << (i)))
#define offBIT(mask, i) (mask &~ (1ll << (i)))
#define cntbit __builtin_popcountll
#define logg(x) 31-__builtin_clz(x)
#define Blog(n) (63 - __builtin_clzll(n))
#define sqrt sqrtl
#define ii pair<ll,ll>
#define vi vector<ll>
#define vpi vector<ii>
#define vii vector<vector<ll>>
#define reset(c, x) memset(c, x, sizeof(c))


const int base = 311;
const ll mod = 1e9+7;
const ll oo = 1e18;
const int dx[] = {0, 1, 0, -1};
const int dy[] = {1, 0, -1, 0};
const int block = 320;
const double pi = acos(-1);




template <class X, class Y> bool maximize(X &a, const Y &b){
    if(a < b) return a = b, true;
    return false;
}



template <class X, class Y> bool minimize(X &a, const Y &b){
    if(a > b) return a = b, true;
    return false;
}


mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
template <class T> T rand(T l, T h) { return uniform_int_distribution <T> (l, h) (rng); }
template <class T> T rand(T h) { return uniform_int_distribution <T> (0, h - 1) (rng); }


ll fixmod(ll xxx){ if (xxx<0) return (xxx+mod*mod)%mod;return xxx%mod;}
ll sqr(ll xxx){return (xxx*xxx);}
ll pw(ll xxx,ll kkk) {if (kkk==0) return 1;ll tmp=pw(xxx,kkk/2);if (kkk%2) return fixmod(fixmod(tmp*tmp)*xxx);return fixmod(tmp*tmp);}




ll n, m;
vector<pair<ll, ii>> g[maxN];
vector<ii> ke[maxN];
ll sum[maxN];
bool vis[maxN];
ll d[maxN];
ll cur;


void dij(ll s)
{
	For(i, 1, cur) d[i] = oo;
	priority_queue<ii, vpi, greater<ii>> pq;
	pq.push({0, 1});
	while (pq.size())
	{
		ii x = pq.top();
		pq.pop();
		if (vis[x.se]) continue;
		vis[x.se] = 1;
		for (auto xx : ke[x.se])
		{
			if (d[xx.fi] <= x.fi + xx.se) continue;
			d[xx.fi] = x.fi + xx.se;
			pq.push({d[xx.fi], xx.fi});
		}
	}

}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    freopen(task".inp","r",stdin);
    freopen(task".ans","w",stdout);

    cin >> n >> m;
    For(i, 1, m)
    {
    	ll x, y, c, p;
    	cin >> x >> y >> c >> p;
    	g[x].pb({c, {y, p}});
    	g[y].pb({c, {x, p}});
    	ke[x].pb({y, p});
    	ke[y].pb({x, p});
    }
	cur = n;

    For(i, 1, n) sort(g[i].begin(), g[i].end());

    For(i, 1, n)
    {
    	for (auto x : g[i]) sum[x.fi] += x.se.se;
    		ll last = -oo;
    	for (auto x : g[i])
    	{
    		if (x.fi != last)
    		{
    			 ++ cur;    
    			 last = x.fi;
    			 ke[i].pb({cur, 0});
    		}
    		ke[cur].pb({x.se.fi, sum[x.fi] - x.se.se});
    		ke[x.se.fi].pb({cur, sum[x.fi] - x.se.se});
    	}
    	for (auto x : g[i]) sum[x.fi] -= x.se.se;
    }
    dij(1);
    if (d[n] == oo) cout << - 1;
    else cout << d[n];










   cerr << "Time elapsed: " << (1.0 * clock() / CLOCKS_PER_SEC) << " s.\n";
   return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:106:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  106 |     freopen(task".inp","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
Main.cpp:107:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  107 |     freopen(task".ans","w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 34
• Subtask 2: 0 / 24
• Subtask 3: 0 / 42