oj.uz

Submission #28978

# Submission time Handle Problem Language Result Execution time Memory
28978 2017-07-18T02:42:02 Z 서규호 (지각충1)(#1231) Take-out (POI13_usu) C++14
0 / 100
 73 ms 22020 KB 
#include <bits/stdc++.h>
#include <unistd.h>

#define pii pair<int,int>
#define pll pair<lld,lld>
#define pb push_back
#define next nextt
#define lld long long
#define Inf 1000000000
#define Linf 1000000000000000000LL
#define get gett

using namespace std;

int N,ans;
int lev[300002],cnt[300002];
bool check[300002];
vector<int> edge[300002];
queue<int> q;

void bfs(int x){
	check[x] = true;
	q.push(x);
	while(!q.empty()){
		int v = q.front();
		q.pop();
		for(auto &i : edge[v]){
			if(check[i]) continue;
			check[i] = true;
			lev[i] = lev[v]+1;
			q.push(i);
		}
	}
}

bool can(lld x){
	for(int i=1; i<=N; i++){
		if(x*i < cnt[i]) return false;
	}
	return true;
}

int main(){
	scanf("%d",&N);
	for(int i=1; i<N; i++){
		int x,y;
		scanf("%d %d",&x,&y);
		edge[x].pb(y);
		edge[y].pb(x);
	}
	bfs(1);
	for(int i=2; i<=N; i++) cnt[lev[i]]++;
	for(int i=1; i<=N; i++){
		cnt[i] += cnt[i-1];
	}
	int l,r;
	l = 0; r = N-1;
	while(l <= r){
		int m = (l+r)>>1;
		if(can(m)){
			ans = m;
			r = m-1;
		}else l = m+1;
	}
	printf("%d\n",ans);

	return 0;
}

Compilation message

usu.cpp: In function 'int main()':
usu.cpp:44:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&N);
                ^
usu.cpp:47:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d",&x,&y);
                       ^

Subtask #1
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 11692 KB Unexpected end of file - int32 expected
2 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 11692 KB Integer 109 violates the range [1, 100]
2 Halted 0 ms 0 KB -

Subtask #3
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 11692 KB Integer 1199 violates the range [1, 1195]
2 Halted 0 ms 0 KB -

Subtask #4
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 11824 KB Integer 7993 violates the range [1, 3998]
2 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 9 ms 13060 KB Integer 119999 violates the range [1, 119995]
2 Halted 0 ms 0 KB -

Subtask #6
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 16 ms 14340 KB Integer 220087 violates the range [1, 220067]
2 Halted 0 ms 0 KB -

Subtask #7
0 / 11.0

# Verdict Execution time Memory Grader output
1 Runtime error 39 ms 16900 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #8
0 / 11.0

# Verdict Execution time Memory Grader output
1 Runtime error 43 ms 22020 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #9
0 / 12.0

# Verdict Execution time Memory Grader output
1 Runtime error 73 ms 22020 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -