Submission #616035

#	Time	Username	Problem	Language	Result	Execution time	Memory
616035		Clan328	Dungeons Game (IOI21_dungeons)	C++17	13 / 100	747 ms	361144 KiB

dungeons

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<vi> vvi;
typedef vector<vl> vvl;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

int n;
vector<pair<ll, ll>> G, W;
vl dp;

const int LOG = 25;
vector<vvi> up;
vector<vvl> sum;
vi diffS;

ll getDP(int i) {
	if (dp[i] != -1) return dp[i];
	if (i == n) {
		dp[i] = 0;
		return 0;
	}
	dp[i] = W[i].first+getDP(G[i].first);
	return dp[i];
}

pll dist(int x, int d, int j) {
	ll strength = 0;
	for (int i = LOG-1; i >= 0; i--) {
		if ((d>>i)&1) {
			strength += sum[j][x][i];
			x = up[j][x][i];
		}
	}

	return {x, strength};
}

void init(int nx, vi s, vi p, vi w, vi l) {
	n = nx;
	G = vector<pll>(n);
	W = vector<pll>(n);

	for (int i = 0; i < n; i++) {
		G[i] = {w[i], l[i]};
		W[i] = {s[i], p[i]};
	}

	set<int> tmp;
	for (int i = 0; i < n; i++) tmp.insert(s[i]);

	for (auto it = tmp.begin(); it != tmp.end(); it++) {
		diffS.push_back(*it);
	}

	dp = vl(n+1, -1);
	for (int i = 0; i <= n; i++) {
		dp[i] = getDP(i);
	}

	up = vector<vvi>(diffS.size(), vvi(n+1, vi(LOG)));
	sum = vector<vvl>(diffS.size(), vvl(n+1, vl(LOG)));
	
	ll curr = 0;
	for (int j = 0; j < diffS.size(); j++) {
		up[j][n][0] = n;
		sum[j][n][0] = 0;
		for (int i = 0; i < n; i++) {
			if (W[i].first <= curr) {
				up[j][i][0] = G[i].first;
				sum[j][i][0] = W[i].first;
			} else {
				up[j][i][0] = G[i].second;
				sum[j][i][0] = W[i].second;
			}
		}

		for (int i = 1; i < LOG; i++) {
			for (int v = 0; v <= n; v++) {
				sum[j][v][i] = sum[j][v][i-1] + sum[j][up[j][v][i-1]][i-1];
				up[j][v][i] = up[j][up[j][v][i-1]][i-1];
			}
		}

		curr = diffS[j];
	}
}

ll simulate(int x, int z) {
	if (z >= W[0].first) {
		return z + dp[x];
	}

	ll strength = z;
	int res;
	for (int i = 0; i < diffS.size(); i++) {
		int lo = 0, hi = 2e7, mid;
		res = 2e7;
		while (lo <= hi) {
			mid = (lo+hi)/2;
			if (dist(x, mid, i).second+strength >= diffS[i]) {
				res = mid;
				hi = mid -1;
			} else
				lo = mid + 1;
		}

		strength += dist(x, res, i).second;
	}
	
	return strength+dp[dist(x, res, diffS.size()-1).first];
}

Compilation message (stderr)

dungeons.cpp: In function 'void init(int, vi, vi, vi, vi)':
dungeons.cpp:70:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |  for (int j = 0; j < diffS.size(); j++) {
      |                  ~~^~~~~~~~~~~~~~
dungeons.cpp: In function 'll simulate(int, int)':
dungeons.cpp:101:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  101 |  for (int i = 0; i < diffS.size(); i++) {
      |                  ~~^~~~~~~~~~~~~~
dungeons.cpp:116:48: warning: 'res' may be used uninitialized in this function [-Wmaybe-uninitialized]
  116 |  return strength+dp[dist(x, res, diffS.size()-1).first];
      |                                                ^

• Subtask 1: 0 / 11
• Subtask 2: 0 / 26
• Subtask 3: 13 / 13
• Subtask 4: 0 / 12
• Subtask 5: 0 / 27
• Subtask 6: 0 / 11