Submission #72475

#	Time	Username	Problem	Language	Result	Execution time	Memory
72475		BBBSNG (#118)	Easy Data Structure Problem (FXCUP3_easy)	C++17	0 / 100	4 ms	2916 KiB

easy

#include <bits/stdc++.h>

using namespace std;

struct lr{
	int l, r;
	lr() {}
	lr(int l, int r) : l(l), r(r) {}
};

vector <lr> V[101010];
int A[101010], I[101010];
int T[303030], L[303030], R[303030];
int Q[55], dp1[55][22], dp2[55][22];
int n, k, sz;

void query()
{
	int i, j, l, x, y;
	
	if(k == 1){
		printf("%d %d\n", I[Q[1]], I[Q[1]]);
		return;
	}
	
	sort(Q + 1, Q + k + 1, [&](int &ca, int &cb){
		return I[ca] < I[cb];
	});
	
	for(i=1; i<=k; i++){
		for(j=0; j<20; j++) dp1[i][j] = dp2[i][j] = 0;
	}
	
	x = V[Q[1]].size();
	for(j=0; j<x; j++) dp1[1][j] = V[Q[1]][j].l;
	
	for(i=2; i<=k; i++){
		x = V[Q[i]].size();
		for(j=1; j<x; j++){
			for(l=0; l<j; l++){
				if(dp1[i-1][l] && V[Q[i-1]][l].r + 1 == V[Q[i]][j].l){
					dp1[i][j] = dp1[i-1][l];
					break;
				}
			}
		}
	}
	
	x = V[Q[k]].size();
	for(j=0; j<x; j++) dp2[k][j] = V[Q[k]][j].r;
	
	for(i=k-1; i>=1; i--){
		x = V[Q[i]].size();
		for(j=1; j<x; j++){
			for(l=0; l<j; l++){
				if(dp2[i+1][l] && V[Q[i+1]][l].l == V[Q[i]][j].r + 1){
					dp2[i][j] = dp2[i+1][l];
					break;
				}
			}
		}
	}
	
	x = V[Q[1]].size();
	for(j=0; j<x; j++){
		if(dp2[1][j]){
			printf("%d %d\n", V[Q[1]][j].l, dp2[1][j]);
			return;
		}
	}
	
	x = V[Q[k]].size();
	for(j=0; j<x; j++){
		if(dp1[k][j]){
			printf("%d %d\n", dp1[k][j], V[Q[k]][j].r);
			return;
		}
	}
	
	
	for(i=1; i<k; i++){
		x = V[Q[i]].size(); y = V[Q[i+1]].size();
		for(j=0; j<x; j++) for(l=0; l<y; l++){
			if(dp1[i][j] && dp2[i+1][l] && V[Q[i]][j].r + 1 == V[Q[i+1]][l].l){
				printf("%d %d\n", dp1[i][j], dp2[i+1][l]);
				return;
			}
		}
	}
	
	printf("-1\n");
}

int main()
{
	int q, i;
	
	scanf("%d%d", &n, &q);
	
	for(sz=1; sz<n; sz<<=1);
	
	for(i=0; i<n; i++){
		scanf("%d", A + i);
		I[A[i]] = i + 1;
	}
	
	for(i=0; i<n; i++){
		T[sz + i] = A[i];
		L[sz + i] = i + 1; R[sz + i] = i + 1;
		V[A[i]].emplace_back(i + 1, i + 1);
	}
	for(; i<sz; i++){
		T[sz + i] = 1e9;
		L[sz + i] = i + 1; R[sz + i] = i + 1;
	}
	
	for(i=sz-1; i; i--){
		T[i] = min(T[i << 1], T[i << 1 | 1]);
		L[i] = L[i << 1]; R[i] = R[i << 1 | 1];
		if(R[i] <= n) V[T[i]].emplace_back(L[i], R[i]);
	}
	
	for(; q--; ){
		scanf("%d", &k);
		for(i=1; i<=k; i++) scanf("%d", Q + i);
		query();
	}
	
	return 0;
}

Compilation message (stderr)

easy.cpp: In function 'int main()':
easy.cpp:98:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &n, &q);
  ~~~~~^~~~~~~~~~~~~~~~
easy.cpp:103:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", A + i);
   ~~~~~^~~~~~~~~~~~~
easy.cpp:124:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &k);
   ~~~~~^~~~~~~~~~
easy.cpp:125:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   for(i=1; i<=k; i++) scanf("%d", Q + i);
                       ~~~~~^~~~~~~~~~~~~

• Subtask 1: 0 / 33
• Subtask 2: 0 / 67