Submission #1613564


Source Code Expand

#include <bits/stdc++.h>
#define N 2000050

#define x first
#define y second

using namespace std;
typedef long long LL;
typedef pair<LL,LL> pii;
pii f[N],tmp1[N],tmp2[N];
int ch[N][2],fa[N],v[N],tp[N],vis[N],le[N],ri[N],mid[N],n,m;
LL lim;
bool flag;

void link(int a,int b) {ch[a][0] ? ch[a][1] = b : ch[a][0] = b;}
inline int rd() {int r;scanf("%d",&r);return r;}

void solve(int u,int l,int r) {
	if (!flag) return ;
	if (!ch[u][0] && !ch[u][1]) {
		f[l] = pii(v[u], v[u]);
		tp[u] = l;
		return ;
	}
	int L = ch[u][0], R = ch[u][1];
	solve(L, l, mid[u]);
	solve(R, mid[u]+1, r);

	int T = tp[R], q1 = 0, q2 = 0;
	for (int i=tp[L];i>=l;i--) {
		while (T>=mid[u]+1 && f[i].y+f[T].x > lim) T--;
		if (T>=mid[u]+1 && f[i].y + f[T].x <= lim)
			tmp1[++q1] = pii(f[i].x, f[T].y);
	}

	T = tp[L];
	for (int i=tp[R];i>=mid[u]+1;i--) {
		while (T>=l && f[i].y+f[T].x > lim) T--;
		if (T>=l && f[i].y+f[T].x <= lim)
			tmp2[++q2] = pii(f[i].x, f[T].y);
	}

	if (!q1 && !q2) {flag = 0; return ;}
	tp[u] = l-1;
	while (q1 || q2) {
		pii cur;
		if (q1 && q2)
			cur = tmp1[q1].x < tmp2[q2].x ? tmp1[q1--] : tmp2[q2--];
		else
			cur = !q1 ? tmp2[q2--] : tmp1[q1--];
		if (tp[u] >= l && cur.y >= f[ tp[u] ].y) continue;
		f[ ++tp[u] ] = cur;
	}
	for (int _=l;_<=tp[u];_++) f[_].x += v[u], f[_].y += v[u];

}

void dfs(int u) {
	if (!ch[u][0] && !ch[u][1]) {
		le[u] = ri[u] = ++m;
		return ;
	}
	dfs(ch[u][0]); dfs(ch[u][1]);
	le[u] = le[ ch[u][0] ];
	ri[u] = ri[ ch[u][1] ];
	mid[u] = ri[ ch[u][0] ];
}

bool go(LL x) {
	lim = x, flag = 1;
	solve(1,1,m);
	return flag;
}

int main() {
	n = rd();
	for (int _=2;_<=n;_++) {
		fa[_] = rd(), v[_] = rd();
		link(fa[_], _);
		if (!vis[ fa[_] ]) vis[ fa[_] ] = 1;
	}

	dfs(1);
	LL l = 1, r = 100000000000LL;
	while (l < r) {
		LL mi = (l + r) >> 1;
		if (go(mi)) r = mi; else l = mi + 1;
	}
	cout << l << endl;
	return 0;
}

Submission Info

Submission Time
Task E - Shik and Travel
User HERESY
Language C++14 (GCC 5.4.1)
Score 0
Code Size 1949 Byte
Status WA
Exec Time 129 ms
Memory 33536 KB

Compile Error

./Main.cpp: In function ‘int rd()’:
./Main.cpp:16:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
 inline int rd() {int r;scanf("%d",&r);return r;}
                                      ^

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 0 / 1400
Status
AC × 3
WA × 1
AC × 53
WA × 1
Set Name Test Cases
Sample example0.txt, example1.txt, example2.txt, example3.txt
All 000.txt, 001.txt, 002.txt, 003.txt, 004.txt, 005.txt, 006.txt, 007.txt, 008.txt, 009.txt, 010.txt, 011.txt, 012.txt, 013.txt, 014.txt, 015.txt, 016.txt, 017.txt, 018.txt, 019.txt, 020.txt, 021.txt, 022.txt, 023.txt, 024.txt, 025.txt, 026.txt, 027.txt, 028.txt, 029.txt, 030.txt, 031.txt, 032.txt, 033.txt, 034.txt, 035.txt, 036.txt, 037.txt, 038.txt, 039.txt, 040.txt, 041.txt, 042.txt, 043.txt, 044.txt, 045.txt, 046.txt, 047.txt, 048.txt, 049.txt, example0.txt, example1.txt, example2.txt, example3.txt
Case Name Status Exec Time Memory
000.txt AC 7 ms 20736 KB
001.txt AC 7 ms 20736 KB
002.txt AC 7 ms 20736 KB
003.txt AC 6 ms 20736 KB
004.txt AC 7 ms 20736 KB
005.txt AC 7 ms 20736 KB
006.txt AC 7 ms 20736 KB
007.txt AC 7 ms 20736 KB
008.txt AC 7 ms 20736 KB
009.txt AC 7 ms 20736 KB
010.txt AC 123 ms 29440 KB
011.txt AC 126 ms 29440 KB
012.txt AC 129 ms 29440 KB
013.txt AC 124 ms 29440 KB
014.txt AC 114 ms 29440 KB
015.txt AC 127 ms 29440 KB
016.txt AC 124 ms 29440 KB
017.txt AC 129 ms 29440 KB
018.txt AC 125 ms 29440 KB
019.txt AC 118 ms 29440 KB
020.txt AC 127 ms 29440 KB
021.txt AC 128 ms 29440 KB
022.txt AC 123 ms 29440 KB
023.txt AC 125 ms 29440 KB
024.txt AC 122 ms 29440 KB
025.txt AC 113 ms 29440 KB
026.txt AC 114 ms 29440 KB
027.txt AC 124 ms 29440 KB
028.txt AC 119 ms 29440 KB
029.txt AC 109 ms 29440 KB
030.txt AC 113 ms 27136 KB
031.txt AC 119 ms 29440 KB
032.txt AC 116 ms 29440 KB
033.txt AC 105 ms 27136 KB
034.txt AC 109 ms 27136 KB
035.txt AC 118 ms 29440 KB
036.txt AC 114 ms 27136 KB
037.txt AC 115 ms 27136 KB
038.txt AC 112 ms 27136 KB
039.txt AC 88 ms 29440 KB
040.txt AC 94 ms 27136 KB
041.txt AC 108 ms 29440 KB
042.txt AC 108 ms 29440 KB
043.txt AC 108 ms 29440 KB
044.txt AC 99 ms 33536 KB
045.txt AC 98 ms 31488 KB
046.txt AC 102 ms 32128 KB
047.txt AC 100 ms 31616 KB
048.txt AC 104 ms 32896 KB
049.txt AC 5 ms 20736 KB
example0.txt AC 5 ms 20736 KB
example1.txt AC 5 ms 20736 KB
example2.txt AC 5 ms 20736 KB
example3.txt WA 5 ms 20864 KB