Submission #355510

#	Time	Username	Problem	Language	Result	Execution time	Memory
355510		deadeye	Traffic (IOI10_traffic)	C++14	50 / 100	511 ms	156984 KiB

traffic

// 为什么～

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define fi first
#define si second
typedef pair<int,int> pi;

#ifdef LOCAL
#define debug(...) __f(#__VA_ARGS__, __VA_ARGS__)
#else
#define debug(...) 69
#endif
template <typename Arg>
void __f(string name, Arg arg) {
	cerr << name << " = " << arg << endl;
}
template <typename Head, typename... Tail>
void __f(string names, Head head, Tail... tail) {
	string cur = "";
	for (auto ch: names){if(ch==','){break;}else{cur+=ch;}}
	string nxt = names.substr(cur.size()+2);
	cerr << cur << " = " << head << ", ";
	__f(nxt, tail...);
}

const int MXN = 1000005, INF = 2e9 + 10;
int sz[MXN], ans[MXN], best = INF, total, num[MXN], ret;
vector<int> adj[MXN];

void dfs(int x, int p) {
	for (auto i: adj[x]) if (i != p) {
		dfs(i, x);
		num[x] += num[i];
		ans[x] = max(ans[x], num[x]);
	}
	ans[x] = max(ans[x], total - num[x] - sz[x]);
	num[x] += sz[x];
}

int LocateCentre(int N, int P[], int S[], int D[]) {
	for (int i = 0; i < N; ++i) {
		total += P[i];
		sz[i] = P[i];
	}
	for (int i = 0; i < N - 1; ++i) {
		adj[S[i]].pb(D[i]);
		adj[D[i]].pb(S[i]);
	}
	dfs(0, -1);
	for (int i = 0; i < N; ++i) {
		if (ans[i] < best) {
			ret = i;
			best = ans[i];
		}
		debug(ans[i], i);
	}
	return ret;
}

Compilation message (stderr)

traffic.cpp: In function 'int LocateCentre(int, int*, int*, int*)':
traffic.cpp:13:20: warning: statement has no effect [-Wunused-value]
   13 | #define debug(...) 69
      |                    ^~
traffic.cpp:57:3: note: in expansion of macro 'debug'
   57 |   debug(ans[i], i);
      |   ^~~~~

• Subtask 1: 25 / 25
• Subtask 2: 25 / 25
• Subtask 3: 0 / 25
• Subtask 4: 0 / 25