oj.uz

Submission #475780

# Submission time Handle Problem Language Result Execution time Memory
475780 2021-09-24T04:31:32 Z maomao90 Aesthetic (NOI20_aesthetic) C++17
35 / 100
 2000 ms 56976 KB 
#include <bits/stdc++.h> 
using namespace std;

template <class T>
inline bool mnto(T& a, T b) {return a > b ? a = b, 1 : 0;}
template <class T>
inline bool mxto(T& a, T b) {return a < b ? a = b, 1: 0;}
#define REP(i, s, e) for (int i = s; i < e; i++)
#define RREP(i, s, e) for (int i = s; i >= e; i--)
typedef long long ll;
typedef long double ld;
#define MP make_pair
#define FI first
#define SE second
typedef pair<int, int> ii;
typedef pair<ll, ll> pll;
#define MT make_tuple
typedef tuple<int, int, int> iii;
#define ALL(_a) _a.begin(), _a.end()
#define pb push_back
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<ii> vii;

#ifdef DEBUG
#define debug(args...) printf(args)
#else
#define debug(args...)
#endif

#define INF 1000000005
#define LINF 1000000000000000005
#define MOD 1000000007
#define MAXN 300005

struct edge {
	int v, w, p;
};

int n, m;
vector<edge> adj[MAXN];
int a[MAXN], b[MAXN], w[MAXN], p[MAXN];
ll base;

priority_queue<pll, vector<pll>, greater<pll>> pq;
ll d1[MAXN], dn[MAXN];
void dij(int s, ll* d) {
	REP (i, 1, n + 1) {
		d[i] = LINF;
	}
	d[s] = 0;
	pq.push(MP(0, s));
	while (!pq.empty()) {
		auto [ud, u] = pq.top(); pq.pop();
		if (ud != d[u]) continue;
		for (edge e : adj[u]) {
			if (mnto(d[e.v], ud + e.w)) {
				pq.push(MP(d[e.v], e.v));
			}
		}
	}
}

ll x;
bool res;
int pre[MAXN], top[MAXN], ptr;
vector<edge> nadj[MAXN];
void dfs(int u, int p) {
	pre[u] = top[u] = ptr++;
	for (edge e : nadj[u]) {
		if (e.v == p) continue;
		if (pre[e.v] == -1) {
			dfs(e.v, u);
			mnto(top[u], top[e.v]);
			if (top[e.v] > pre[u]) {
				if ((min(d1[u] + dn[e.v], d1[e.v] + dn[u])
					   	+ e.w + e.p > x + base) && 
						pre[n] != -1 && 
						pre[n] >= pre[e.v])	{
					res = 1;
				}
			}
		} else {
			mnto(top[u], pre[e.v]);
		}
	}
}

bool isPos(ll x) {
	REP (i, 1, n + 1) {
		nadj[i].clear();
	}
	debug("%lld\n", x);
	REP (i, 0, m) {
		if (min(d1[a[i]] + dn[b[i]], d1[b[i]] + dn[a[i]]) + w[i] <= x + base) {
			debug(" %d %d %d\n", a[i], b[i], p[i]);
			debug("  %lld + %d + %d\n", min(d1[a[i]] + dn[b[i]], d1[b[i]] + dn[a[i]]), w[i], p[i]);
			nadj[a[i]].pb({b[i], w[i], p[i]});
			nadj[b[i]].pb({a[i], w[i], p[i]});
		}
	}
	ptr = 0;
	::x = x;
	res = 0;
	memset(pre, -1, sizeof pre);
	REP (i, 1, n + 1) {
		if (pre[i] == -1) {
			dfs(i, -1);
		}
	}
	return res;
}

int main() {
	scanf("%d%d", &n, &m);
	REP (i, 0, m) {
		scanf("%d%d%d", &a[i], &b[i], &w[i]);
	}
	int mx = 0;
	RREP (i, m - 1, 0) {
		p[i] = mx;
		mxto(mx, w[i]);
	}
	REP (i, 0, m) {
		adj[a[i]].pb({b[i], w[i], p[i]});
		adj[b[i]].pb({a[i], w[i], p[i]});
	}
	dij(1, d1);
	dij(n, dn);
	base = d1[n];
	ll lo = 0, hi = INF, mid;
	while (lo < hi) {
		mid = lo + hi + 1 >> 1;
		if (isPos(mid)) {
			lo = mid;
		} else {
			hi = mid - 1;
		}
	}
	printf("%lld\n", base + lo + 1);
	return 0;
}

Compilation message

Aesthetic.cpp: In function 'int main()':
Aesthetic.cpp:133:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  133 |   mid = lo + hi + 1 >> 1;
      |         ~~~~~~~~^~~
Aesthetic.cpp:115:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  115 |  scanf("%d%d", &n, &m);
      |  ~~~~~^~~~~~~~~~~~~~~~
Aesthetic.cpp:117:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  117 |   scanf("%d%d%d", &a[i], &b[i], &w[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 15564 KB Output is correct
2 Correct 10 ms 15556 KB Output is correct
3 Correct 10 ms 15560 KB Output is correct
4 Correct 11 ms 15604 KB Output is correct
5 Correct 11 ms 15564 KB Output is correct
6 Correct 10 ms 15556 KB Output is correct
7 Correct 10 ms 15564 KB Output is correct
8 Correct 12 ms 15552 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 15564 KB Output is correct
2 Correct 10 ms 15556 KB Output is correct
3 Correct 10 ms 15560 KB Output is correct
4 Correct 11 ms 15604 KB Output is correct
5 Correct 11 ms 15564 KB Output is correct
6 Correct 10 ms 15556 KB Output is correct
7 Correct 10 ms 15564 KB Output is correct
8 Correct 12 ms 15552 KB Output is correct
9 Correct 13 ms 15692 KB Output is correct
10 Correct 12 ms 15788 KB Output is correct
11 Correct 14 ms 15696 KB Output is correct
12 Correct 12 ms 15804 KB Output is correct
13 Correct 12 ms 15820 KB Output is correct
14 Correct 12 ms 15840 KB Output is correct
15 Correct 12 ms 15820 KB Output is correct
16 Correct 13 ms 15824 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 678 ms 38708 KB Output is correct
2 Correct 708 ms 45212 KB Output is correct
3 Correct 594 ms 44740 KB Output is correct
4 Correct 625 ms 44712 KB Output is correct
5 Correct 624 ms 45252 KB Output is correct
6 Correct 619 ms 45688 KB Output is correct
7 Correct 627 ms 45288 KB Output is correct
8 Correct 648 ms 45724 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 634 ms 39180 KB Output is correct
2 Correct 621 ms 45284 KB Output is correct
3 Correct 558 ms 45140 KB Output is correct
4 Correct 614 ms 45532 KB Output is correct
5 Correct 580 ms 45080 KB Output is correct
6 Correct 555 ms 45064 KB Output is correct
7 Correct 626 ms 45132 KB Output is correct
8 Correct 666 ms 45312 KB Output is correct

Subtask #5
0 / 16.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2070 ms 56976 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 2070 ms 56976 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #7
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 15564 KB Output is correct
2 Correct 10 ms 15556 KB Output is correct
3 Correct 10 ms 15560 KB Output is correct
4 Correct 11 ms 15604 KB Output is correct
5 Correct 11 ms 15564 KB Output is correct
6 Correct 10 ms 15556 KB Output is correct
7 Correct 10 ms 15564 KB Output is correct
8 Correct 12 ms 15552 KB Output is correct
9 Correct 13 ms 15692 KB Output is correct
10 Correct 12 ms 15788 KB Output is correct
11 Correct 14 ms 15696 KB Output is correct
12 Correct 12 ms 15804 KB Output is correct
13 Correct 12 ms 15820 KB Output is correct
14 Correct 12 ms 15840 KB Output is correct
15 Correct 12 ms 15820 KB Output is correct
16 Correct 13 ms 15824 KB Output is correct
17 Correct 678 ms 38708 KB Output is correct
18 Correct 708 ms 45212 KB Output is correct
19 Correct 594 ms 44740 KB Output is correct
20 Correct 625 ms 44712 KB Output is correct
21 Correct 624 ms 45252 KB Output is correct
22 Correct 619 ms 45688 KB Output is correct
23 Correct 627 ms 45288 KB Output is correct
24 Correct 648 ms 45724 KB Output is correct
25 Correct 634 ms 39180 KB Output is correct
26 Correct 621 ms 45284 KB Output is correct
27 Correct 558 ms 45140 KB Output is correct
28 Correct 614 ms 45532 KB Output is correct
29 Correct 580 ms 45080 KB Output is correct
30 Correct 555 ms 45064 KB Output is correct
31 Correct 626 ms 45132 KB Output is correct
32 Correct 666 ms 45312 KB Output is correct
33 Execution timed out 2070 ms 56976 KB Time limit exceeded
34 Halted 0 ms 0 KB -