Submission #349234

#	Time	Username	Problem	Language	Result	Execution time	Memory
349234		dolphingarlic	The Potion of Great Power (CEOI20_potion)	C++14	100 / 100	2305 ms	48748 KiB

potion

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

const int INF = 1e9, C = 50;

int H[100000];
bool odd[100000];
vector<int> u_times[100000];
vector<vector<int>> trust[100000];
struct cmp {
	bool operator()(pair<int, int> a, pair<int, int> b) const {
		return tie(H[a.second], a.first) < tie(H[b.second], b.first);
	}
};
vector<set<pair<int, int>, cmp>> updates[100000];

void init(int N, int D, int H[]) {
	for (int i = 0; i < N; i++) {
		trust[i].push_back({});
		updates[i].push_back({});
		u_times[i].push_back(0);
		::H[i] = H[i];
	}
}

vector<int> playback(int s, int t) {
	int ub = upper_bound(u_times[s].begin(), u_times[s].end(), t) - u_times[s].begin() - 1;
	vector<int> orig = trust[s][ub];
	set<pair<int, int>, cmp> upd = updates[s][ub];
	for (int i : orig) odd[i] ^= 1;
	for (pair<int, int> i : upd) {
		if (i.first >= t) continue;
		odd[i.second] ^= 1;
	}
	vector<int> ret1, ret2;
	for (int i : orig) if (odd[i]) ret1.push_back(i), odd[i] = 0;
	for (pair<int, int> i : upd) {
		if (i.first >= t) continue;
		if (odd[i.second]) ret2.push_back(i.second), odd[i.second] = 0;
	}
	vector<int> mrg;
	int ptr1 = 0, ptr2 = 0;
	while (ptr1 < ret1.size() && ptr2 < ret2.size()) {
		if (H[ret1[ptr1]] < H[ret2[ptr2]]) mrg.push_back(ret1[ptr1++]);
		else mrg.push_back(ret2[ptr2++]);
	}
	while (ptr1 < ret1.size()) mrg.push_back(ret1[ptr1++]);
	while (ptr2 < ret2.size()) mrg.push_back(ret2[ptr2++]);
	return mrg;
}

void curseChanges(int U, int A[], int B[]) {
	for (int i = 0; i < U; i++) {
		updates[A[i]].back().insert({i, B[i]});
		updates[B[i]].back().insert({i, A[i]});
		if (updates[A[i]].back().size() == C) {
			trust[A[i]].push_back(playback(A[i], i + 1));
			updates[A[i]].push_back({});
			u_times[A[i]].push_back(i + 1);
		}
		if (updates[B[i]].back().size() == C) {
			trust[B[i]].push_back(playback(B[i], i + 1));
			updates[B[i]].push_back({});
			u_times[B[i]].push_back(i + 1);
		}
	}
}

int question(int x, int y, int v) {
	vector<int> sx = playback(x, v);
	vector<int> sy = playback(y, v);
	int ans = INF;
	for (int xptr = 0, yptr = 0; xptr != sx.size() && yptr != sy.size();) {
		ans = min(ans, abs(H[sx[xptr]] - H[sy[yptr]]));
		if (H[sx[xptr]] <= H[sy[yptr]]) xptr++;
		else yptr++;
	}
	return ans;
}

Compilation message (stderr)

potion.cpp: In function 'std::vector<int> playback(int, int)':
potion.cpp:43:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |  while (ptr1 < ret1.size() && ptr2 < ret2.size()) {
      |         ~~~~~^~~~~~~~~~~~~
potion.cpp:43:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |  while (ptr1 < ret1.size() && ptr2 < ret2.size()) {
      |                               ~~~~~^~~~~~~~~~~~~
potion.cpp:47:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |  while (ptr1 < ret1.size()) mrg.push_back(ret1[ptr1++]);
      |         ~~~~~^~~~~~~~~~~~~
potion.cpp:48:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |  while (ptr2 < ret2.size()) mrg.push_back(ret2[ptr2++]);
      |         ~~~~~^~~~~~~~~~~~~
potion.cpp: In function 'int question(int, int, int)':
potion.cpp:73:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   73 |  for (int xptr = 0, yptr = 0; xptr != sx.size() && yptr != sy.size();) {
      |                               ~~~~~^~~~~~~~~~~~
potion.cpp:73:57: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   73 |  for (int xptr = 0, yptr = 0; xptr != sx.size() && yptr != sy.size();) {
      |                                                    ~~~~~^~~~~~~~~~~~

• Subtask 1: 0 / 0
• Subtask 2: 17 / 17
• Subtask 3: 14 / 14
• Subtask 4: 18 / 18
• Subtask 5: 21 / 21
• Subtask 6: 30 / 30