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Submission #261342

# Submission time Handle Problem Language Result Execution time Memory
261342 2020-08-11T16:21:50 Z Berted Aesthetic (NOI20_aesthetic) C++14
35 / 100
 2000 ms 53176 KB 
#include <iostream>
#include <vector>
#include <queue>
#include <tuple>
#include <bitset>
#define ll long long
#define vi vector<int>
#define pii pair<ll, int>
#define fst first
#define snd second
#define pub push_back
#define vpi vector<pii>
 
using namespace std;
 
namespace fastIO
{
	char outString[64];
	inline int getchar_unlocked() {return getchar();}
	inline void putchar_unlocked(int x) {putchar(x);}
	inline int charInput() {return getchar_unlocked();}
	inline void charOutput(int x) {putchar_unlocked(x);}
	inline bool isNum(int c) {return '0' <= c && c <= '9';}
	inline int intInput()
	{
		int c = 0, ret = 0; bool neg = 0;
		while (!isNum(c)) 
		{
			c = getchar_unlocked();
			if (c == '-') {neg = 1;}
		}
		while (isNum(c)) {ret = ret * 10 + c - '0'; c = getchar_unlocked();}
		return (neg) ? -ret : ret;
	}
	inline void intOutput(ll x)
	{
		int ss = 0;
		while (x) {outString[ss++] = x % 10 + '0'; x /= 10;}
		if (!ss) outString[ss++] = '0';
		for (int i = ss - 1; i >= 0; i--) putchar_unlocked(outString[i]);
	}
	inline void strOutput(string s)
	{
		for (auto &c : s) putchar_unlocked(c);
	}
}
 
const ll INF = 1e17;
 
int n, m, pref[300069], cst[300069], idx = 0, vis[300069], low[300069], pid = 0;
vpi adj[300069];
pii edge[300069];
ll dst[2][300069], de[2][300069], lim;
priority_queue<pii, vector<pii>, greater<pii>> pq;
bool ans = 0;
 
inline void runDijkstra(int s, int id)
{
	for (int i = 0; i < n; i++) dst[id][i] = INF;
	dst[id][s] = 0;
	pq.push({0, s});
	while (pq.size())
	{
		ll d = pq.top().fst; int u = pq.top().snd; pq.pop();
		if (d == dst[id][u])
		{
			for (auto v : adj[u])
			{
				if (dst[id][u] + cst[v.fst] < dst[id][v.snd])
				{
					dst[id][v.snd] = dst[id][u] + cst[v.fst];
					pq.push({dst[id][v.snd], v.snd});
				}
			}
		}
	}
}
 
void bCheck(int u, int p)
{		
	vis[u] = low[u] = idx++;
	//cout << "Visit : " << idx << "\n";
	for (auto v : adj[u])
	{
		if (v.snd != p && de[0][v.fst] <= lim)
		{
			if (vis[v.snd] < pid)
			{
				bCheck(v.snd, u);
				if (ans) return;
				low[u] = min(low[v.snd], low[u]);
			}
			else low[u] = min(vis[v.snd], low[u]);
			
			if (low[v.snd] > vis[u] && (vis[n - 1] >= pid && low[v.snd] <= vis[n - 1]) && de[1][v.fst] > lim) {ans = 1; return;}
		}
	}
}
 
int32_t main()
{
	// ios :: sync_with_stdio(0); cin.tie(0); cout.tie(0);
	// freopen("5-1.in", "r", stdin);
	n = fastIO :: intInput();
	m = fastIO :: intInput();
	for (int i = 0; i < n; i++) vis[i] = -1;
	for (int i = 0; i < m; i++)
	{
		int u, v, w; 
		
		u = fastIO :: intInput();
		v = fastIO :: intInput();
		w = fastIO :: intInput();
 
		u--; v--;
		adj[u].push_back({i, v});
		adj[v].push_back({i, u});
		cst[i] = pref[i] = w;
		edge[i] = {u, v};
	}
	for (int i = m - 2; i >= 0; i--) {pref[i] = max(pref[i], pref[i + 1]);}
	runDijkstra(0, 0);
	runDijkstra(n - 1, 1);
	for (int i = 0; i < m; i++) 
	{
		de[0][i] = min(dst[0][edge[i].fst] + dst[1][edge[i].snd], dst[1][edge[i].fst] + dst[0][edge[i].snd]) + cst[i];
		de[1][i] = de[0][i] + pref[i + 1];
	}
	ll L = dst[0][n - 1], R = dst[0][n - 1] + 1000000000;
	while (L < R)
	{
		ll M = L + R >> 1; lim = M; ans = 0; pid = idx;
		bCheck(0, -1);
		if (ans) L = M + 1;
		else R = M;
	}
	fastIO :: intOutput(L);
	fastIO :: charOutput('\n');
	return 0;
}

Compilation message

Aesthetic.cpp: In function 'int32_t main()':
Aesthetic.cpp:132:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   ll M = L + R >> 1; lim = M; ans = 0; pid = idx;
          ~~^~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 7424 KB Output is correct
2 Correct 6 ms 7424 KB Output is correct
3 Correct 7 ms 7456 KB Output is correct
4 Correct 6 ms 7424 KB Output is correct
5 Correct 6 ms 7424 KB Output is correct
6 Correct 10 ms 7424 KB Output is correct
7 Correct 7 ms 7424 KB Output is correct
8 Correct 7 ms 7424 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 7424 KB Output is correct
2 Correct 6 ms 7424 KB Output is correct
3 Correct 7 ms 7456 KB Output is correct
4 Correct 6 ms 7424 KB Output is correct
5 Correct 6 ms 7424 KB Output is correct
6 Correct 10 ms 7424 KB Output is correct
7 Correct 7 ms 7424 KB Output is correct
8 Correct 7 ms 7424 KB Output is correct
9 Correct 12 ms 7680 KB Output is correct
10 Correct 8 ms 7680 KB Output is correct
11 Correct 8 ms 7680 KB Output is correct
12 Correct 8 ms 7680 KB Output is correct
13 Correct 11 ms 7680 KB Output is correct
14 Correct 9 ms 7680 KB Output is correct
15 Correct 7 ms 7680 KB Output is correct
16 Correct 7 ms 7680 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 629 ms 48608 KB Output is correct
2 Correct 638 ms 48700 KB Output is correct
3 Correct 616 ms 48344 KB Output is correct
4 Correct 617 ms 48376 KB Output is correct
5 Correct 627 ms 48408 KB Output is correct
6 Correct 652 ms 49528 KB Output is correct
7 Correct 670 ms 49192 KB Output is correct
8 Correct 655 ms 49492 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 704 ms 49452 KB Output is correct
2 Correct 685 ms 48792 KB Output is correct
3 Correct 622 ms 48408 KB Output is correct
4 Correct 591 ms 48720 KB Output is correct
5 Correct 614 ms 48724 KB Output is correct
6 Correct 619 ms 48760 KB Output is correct
7 Correct 610 ms 48888 KB Output is correct
8 Correct 515 ms 49016 KB Output is correct

Subtask #5
0 / 16.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2091 ms 53176 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 22.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2091 ms 53176 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #7
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 7424 KB Output is correct
2 Correct 6 ms 7424 KB Output is correct
3 Correct 7 ms 7456 KB Output is correct
4 Correct 6 ms 7424 KB Output is correct
5 Correct 6 ms 7424 KB Output is correct
6 Correct 10 ms 7424 KB Output is correct
7 Correct 7 ms 7424 KB Output is correct
8 Correct 7 ms 7424 KB Output is correct
9 Correct 12 ms 7680 KB Output is correct
10 Correct 8 ms 7680 KB Output is correct
11 Correct 8 ms 7680 KB Output is correct
12 Correct 8 ms 7680 KB Output is correct
13 Correct 11 ms 7680 KB Output is correct
14 Correct 9 ms 7680 KB Output is correct
15 Correct 7 ms 7680 KB Output is correct
16 Correct 7 ms 7680 KB Output is correct
17 Correct 629 ms 48608 KB Output is correct
18 Correct 638 ms 48700 KB Output is correct
19 Correct 616 ms 48344 KB Output is correct
20 Correct 617 ms 48376 KB Output is correct
21 Correct 627 ms 48408 KB Output is correct
22 Correct 652 ms 49528 KB Output is correct
23 Correct 670 ms 49192 KB Output is correct
24 Correct 655 ms 49492 KB Output is correct
25 Correct 704 ms 49452 KB Output is correct
26 Correct 685 ms 48792 KB Output is correct
27 Correct 622 ms 48408 KB Output is correct
28 Correct 591 ms 48720 KB Output is correct
29 Correct 614 ms 48724 KB Output is correct
30 Correct 619 ms 48760 KB Output is correct
31 Correct 610 ms 48888 KB Output is correct
32 Correct 515 ms 49016 KB Output is correct
33 Execution timed out 2091 ms 53176 KB Time limit exceeded
34 Halted 0 ms 0 KB -