Submission #433651

#TimeUsernameProblemLanguageResultExecution timeMemory
433651MounirBridges (APIO19_bridges)C++14
0 / 100
3080 ms2464 KiB
#include <bits/stdc++.h>
#define chmax(x, v) x = max(x, v)
#define pii pair<int, int>
#define pb push_back
#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
#define int long long
using namespace std;

const int N = (1 << 18);
int maxi[N * 2];

int getMax(int gauche, int droite){
	if (droite < gauche)
		return 0;
	if (gauche%2 == 1)
		return max(maxi[gauche], getMax(gauche + 1, droite));
	if (droite%2 == 0)
		return max(maxi[droite], getMax(gauche, droite - 1));
	return getMax(gauche/2, droite/2);
}

void upd(int noeud, int val){
	maxi[N + noeud] = val;
	for (int n = (N + noeud)/2; n > 0; n /= 2)
		maxi[n] = max(maxi[n * 2], maxi[n * 2 + 1]);
}

int noeudArete[N];

signed main(){
	int nNoeuds, nAretes; cin >> nNoeuds >> nAretes;
	for (int iArete = 0; iArete < nAretes; ++iArete){
		int noeud, voisin, poids; cin >> noeud >> voisin >> poids;
		noeudArete[iArete] = noeud - 1;
		upd(noeud - 1, poids);
	}

	int nReqs; cin >> nReqs;
	for (int iReq = 0; iReq < nReqs; ++iReq){
		int typeReq; cin >> typeReq;
		if (typeReq == 1){
			int iArete, poids; cin >> iArete >> poids;
			--iArete;

			upd(noeudArete[iArete], poids);
		}
		else {
			int depart, poids; cin >> depart >> poids;
			--depart;
			int gauche = 0, droite = depart;
			while (droite > gauche){
				int milieu = (droite + gauche)/2;
				int res = getMax(N + milieu, N + depart - 1);

				if (res > poids) //impossible
					gauche = milieu + 1;
				else
					droite = milieu;
			}

			int borneGauche = gauche;
			gauche = depart - 1, droite = nNoeuds - 2;
			while (droite > gauche){
				int milieu = (droite + gauche)/2 + 1;
				int res = getMax(N + depart, N + milieu);

				if (res > poids)
					droite = milieu - 1;
				else
					gauche = milieu;
			}

			int borneDroite = droite;

			cout << borneDroite - borneGauche + 2 << endl;
		}
	}
	return 0;
}
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...