Submission #1019701

#	Time	Username	Problem	Language	Result	Execution time	Memory
1019701		beaconmc	Fire (BOI24_fire)	C++14	0 / 100	203 ms	96500 KiB

Main

#include <bits/stdc++.h>


typedef long long ll;
#define FOR(i,x,y) for(ll i=x; i<y; i++)
#define FORNEG(i,x,y) for(ll i=x; i>y; i--)

using namespace std;

vector<vector<ll>> normal;
map<ll, ll> maxis;
map<ll,ll> par;

ll anc[100005][30];


ll ancc(ll x, ll k){
	if (x==1000000000) return 1000000000;
	if (anc[x][k] != -1) return anc[x][k];
	if (k==0){
		if (par[x] == x) return anc[x][k] = 1000000000;
		return anc[x][k] = par[x];
	}
	return anc[x][k] = ancc(ancc(x, k-1), k-1);
}

int main(){
	FOR(i,0,100005) FOR(j,0,30) anc[i][j] = -1;
	ll n,m;
	cin >> n >> m;

	FOR(i,0,n){
		ll a,b;
		cin >> a >> b;
		if (a<b) normal.push_back({a,b});
		else normal.push_back({a,m+b});
	}

	sort(normal.begin(), normal.end());
	set<ll> things;

	for (auto&i : normal){
		things.insert(i[0]);
		things.insert(i[1]);
	}
	ll cur = 0;
	ll maxi = -1;
	ll maxting = -1;


	for (auto&i : things){
		while (cur < normal.size()){
			if (normal[cur][0] <= i){
				if (normal[cur][1] > maxi){
					maxi = normal[cur][1];
					maxting = cur;
				}
			}else break;
			cur++;
		}
		maxis[i] = maxting;
	}

	FOR(i,0,normal.size()){
		par[i] = maxis[normal[i][1]];
	}
	ll realans = 1000000000;

	FOR(i,0,normal.size()){
		ll orig = normal[i][0];
		ll idk = i;
		ll ans = 0;

		FORNEG(j,29,-1){
			if (ancc(idk, j) != 1000000000 && (normal[ancc(idk, j)][1] - orig)<=m){
				idk = ancc(idk, j);
				ans += (1<<j);
			}
		}

		if (normal[idk][1] - orig >= m){
			realans = min(realans, ans+1);
		}

	}
	if (realans == 1000000000) cout << -1 << endl;
	else cout << realans << endl;








}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:52:14: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |   while (cur < normal.size()){
      |          ~~~~^~~~~~~~~~~~~~~
Main.cpp:5:33: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    5 | #define FOR(i,x,y) for(ll i=x; i<y; i++)
......
   64 |  FOR(i,0,normal.size()){
      |      ~~~~~~~~~~~~~~~~~           
Main.cpp:64:2: note: in expansion of macro 'FOR'
   64 |  FOR(i,0,normal.size()){
      |  ^~~
Main.cpp:5:33: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    5 | #define FOR(i,x,y) for(ll i=x; i<y; i++)
......
   69 |  FOR(i,0,normal.size()){
      |      ~~~~~~~~~~~~~~~~~           
Main.cpp:69:2: note: in expansion of macro 'FOR'
   69 |  FOR(i,0,normal.size()){
      |  ^~~

• Subtask 1: 0 / 14
• Subtask 2: 0 / 17
• Subtask 3: 0 / 9
• Subtask 4: 0 / 13
• Subtask 5: 0 / 21
• Subtask 6: 0 / 26