Submission #309993

#	Time	Username	Problem	Language	Result	Execution time	Memory
309993		Akashi	Training (IOI07_training)	C++14	100 / 100	16 ms	4608 KiB

training

#include <bits/stdc++.h>
using namespace std;

#define x first
#define y second

const int DIM = 1e3 + 5;
const int P = (1 << 10) - 1;

struct drum {
	int x, y, c;
};

int n, m;

int h[DIM], id[DIM];
int dp[DIM][P];
pair <int, int> tt[DIM];

bool viz[DIM];
int mark[DIM];
vector <int> arb[DIM];
vector <drum> v[DIM];

vector <int> l;

int lca(int x, int y) {
	while (x != y) {
		if (h[x] > h[y]) x = tt[x].first;
		else y = tt[y].first;
	}
	return x;
}

void dfs(int nod = 1, int papa = 0) {
	id[nod] = 1;
	for (auto it : arb[nod]) {
		if (it == papa) continue ;
		tt[it] = {nod, id[nod]}; 
		id[nod] *= 2;
		h[it] = h[nod] + 1;
		dfs(it, nod);
	}
}

void get_dp(int now, int nod, int &ad, int &lant) {
	int wh = 0;
	while (now != nod) {
		ad = ad + dp[now][wh];
		
		wh = tt[now].second;
		now = tt[now].first;
	}
	lant |= wh;
}

void solve(int nod = 1, int papa = 0) {
	int p = id[nod] * 2 - 1;
	for (auto it : arb[nod]) {
		if (it == papa) continue ;
		solve(it, nod);

		for (int mask = 0; mask <= p ; ++mask) {
			if (mask & tt[it].second) 
			dp[nod][mask ^ tt[it].second] = max(dp[nod][mask ^ tt[it].second], dp[nod][mask] + dp[it][0]);
		}
	}
	
	for (auto it : v[nod]) {
		int ad = it.c, lant = 0;
		get_dp(it.x, nod, ad, lant);
		get_dp(it.y, nod, ad, lant);

		for (int mask = 0; mask <= p ; ++mask) {
				if ((mask & lant) == lant) 
					dp[nod][mask ^ lant] = max(dp[nod][mask ^ lant], dp[nod][mask] + ad);
		}
	}	
}

int main() {
	scanf("%d%d", &n, &m);

	int x, y, c;
	int sum = 0;

	vector <tuple<int, int, int>> edges;

	for (int i = 1; i <= m ; ++i) {
		scanf("%d%d%d", &x, &y, &c);

		sum += c;
		if (c == 0) {
			arb[x].push_back(y);
			arb[y].push_back(x);
		} else {
			edges.push_back({x, y, c});
		}	
	}

	dfs();
	
	for (auto it : edges) {
		x = get<0>(it);
		y = get<1>(it);
		c = get<2>(it);

		int z = lca(x, y);
		if ((h[x] - h[z] + h[y] - h[z] + 1) % 2 == 0) continue ;
	
		v[z].push_back({x, y, c});
	}

	solve();
	printf("%d", sum - dp[1][0]);
	return 0;
}

Compilation message (stderr)

training.cpp: In function 'int main()':
training.cpp:82:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   82 |  scanf("%d%d", &n, &m);
      |  ~~~~~^~~~~~~~~~~~~~~~
training.cpp:90:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   90 |   scanf("%d%d%d", &x, &y, &c);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 7 / 7
• Subtask 5: 9 / 9
• Subtask 6: 9 / 9
• Subtask 7: 9 / 9
• Subtask 8: 9 / 9
• Subtask 9: 9 / 9
• Subtask 10: 9 / 9
• Subtask 11: 9 / 9