Submission #49299

#	Time	Username	Problem	Language	Result	Execution time	Memory
49299		wzy	Factories (JOI14_factories)	C++11	15 / 100	6099 ms	114016 KiB

factories

            #include <bits/stdc++.h>
            #include "factories.h"
            using namespace std;
            #define pii pair<int,long long>
            #define F first
            #define S second
            #define pb push_back
            bool jafoi[500005];
            vector<pii> adj[500005] ;
            int n , pai[500005] , lca[22][500005] , depth[500005] , st[500005] , t= 0 , ed[500005] ;
            long long  dist[500005] , dp[2][500005];
            int op[1000000];
            int pointer = 0;
            bool inside(int u , int v){
            	return (st[u] <= st[v] && ed[u] >= ed[v]);
            }
            void pre_dfs(int x , int y){
            	lca[0][x] = y;
            	for(int j = 1 ; j< 22 ; j++){
            		if(lca[j-1][x] != -1){
            			lca[j][x] = lca[j-1][lca[j-1][x]];
            		}
            	}
            	st[x] = ++t;
            	for(int j = 0 ; j < adj[x].size() ; j++){
            		pii u = adj[x][j];
            		if(u.first == y) continue;
            		dist[u.first] = dist[x] + u.second;
            		depth[u.first] = depth[x] + 1;
            		pre_dfs(u.first, x);
            	}
            	ed[x] = t;
            }
             
            int query_lca(int x , int y){
            	if(inside(x,y)) return x;
            	if(inside(y,x)) return y;
            	for(int j = 21 ; j >= 0 ; j--){
            		if(lca[j][x] != -1 && !(inside(lca[j][x] , y))) x = lca[j][x];
            	}
            	return lca[0][x];
            }
             
             
             
            void Init(int N, int A[], int B[], int D[]){
            	n = N;
            	for(int i = 0 ; i < N - 1 ; i++){
            		adj[A[i]].pb(pii(B[i] , D[i]));
            		adj[B[i]].pb(pii(A[i] , D[i]));
            	}
            	depth[0] = 0 , dist[0] = 0;
            	pre_dfs(0 , - 1 );
            	for(int i = 0 ; i < N  - 1; i++){
            		adj[A[i]].clear() , adj[B[i]].clear();
            	}
            }
             
            bool cmp(int a , int  b){
            	return st[a] < st[b];
            }
             
            long long ansz = 0;
             
            void solve(int x , int y){
            	for(int j = 0 ; j < adj[x].size() ; j++){
            		pii u = adj[x][j];
            		if(u.F == y) continue;
            		solve(u.F, x);
            		ansz = min(ansz , min(dp[0][x] + dp[1][u.F] + u.S ,  dp[1][x] + dp[0][u.F] + u.S));
            		dp[0][x] = min(dp[0][x] , dp[0][u.F] + u.S);
            		dp[1][x] = min(dp[1][x] , dp[1][u.F] + u.S);
            	}
            	return ;
            }
             
            long long Query(int S , int X[] , int T , int Y[]){
            	pointer = 0;
            	for(int i = 0 ; i < max(S,T) ;i ++){
            		if(!jafoi[X[i]] && i < S){
            			op[pointer++] = X[i];
            			jafoi[X[i]] = 1;
            			dp[0][X[i]] = 0;
            			dp[1][X[i]] = 1000000000000000LL;
            		}
            		if(!jafoi[Y[i]] && i < T){
            			op[pointer++] = Y[i];
            			jafoi[Y[i]] = 1;
            			dp[1][Y[i]] = 0;
            			dp[0][Y[i]] = 1000000000000000LL;
            		}
            	}
            	sort(op , op + pointer , cmp);
            	int Z = (pointer)- 1;
            	for(int i = 0 ; i < Z ; i++){
            		int L = query_lca(op[i] , op[i+1]);
            		if(!jafoi[L]){
            		dp[0][L] = 1000000000000000LL;
            		dp[1][L] = 1000000000000000LL;
            		op[pointer++] = L;		
            		jafoi[L] = 1;
            		}
            	}
            	sort(op , op + pointer , cmp);
            	stack<int> w;
            	int root ;
            	for(int i = 0; i < pointer ; i++){
            			if(w.size() == 0){
            				root = op[i];
            				w.push(op[i]);
            				continue;
            			}
            			while(w.size() && !(inside(w.top() , op[i]))){
            				w.pop();
            			}
            			long long u =dist[op[i]] - dist[w.top()];
            			adj[op[i]].push_back(pii(w.top() , u));
            			adj[w.top()].push_back(pii(op[i] , u));
            			w.push(op[i]);
            		
            	}
            	ansz = 1000000000000000LL;
            	solve(root , root);
            	for(int i = 0 ; i < pointer; i++){
            		adj[op[i]].clear();
            		jafoi[op[i]] = false;
            	}
            	return ansz;
            }

Compilation message (stderr)

factories.cpp: In function 'void pre_dfs(int, int)':
factories.cpp:25:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
              for(int j = 0 ; j < adj[x].size() ; j++){
                              ~~^~~~~~~~~~~~~~~
factories.cpp: In function 'void solve(int, int)':
factories.cpp:66:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
              for(int j = 0 ; j < adj[x].size() ; j++){
                              ~~^~~~~~~~~~~~~~~
factories.cpp: In function 'long long int Query(int, int*, int, int*)':
factories.cpp:123:19: warning: 'root' may be used uninitialized in this function [-Wmaybe-uninitialized]
              solve(root , root);
              ~~~~~^~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 0 / 18
• Subtask 3: 0 / 67