Submission #672481

#TimeUsernameProblemLanguageResultExecution timeMemory
672481ToroTNRace (IOI11_race)C++14
0 / 100
5 ms8916 KiB
#include "race.h" #include<bits/stdc++.h> using namespace std; //#include "grader.cpp" #define ll long long #define pb push_back #define X first #define Y second int n,ans=1e9,m,sz[200005],vis[200005],mn[1000005]; vector<pair<int,int> > v[200005]; void dfs_size(int u,int p) { sz[u]=1; for(auto [node,w]:v[u]) { if(vis[node]==0&&node!=p) { dfs_size(node,u); sz[u]+=sz[node]; } } } int find_cen(int u,int p,int want) { for(auto [node,w]:v[u]) { if(node!=p&&vis[node]==0) { if(sz[node]>want)return find_cen(node,u,want); } } return u; } void compute(int u,int p,int type,int depth,int lv) { if(depth>m)return; if(type==1) { ans=min(ans,lv+mn[m-depth]); }else if(type==0) { mn[depth]=min(mn[depth],lv); }else { mn[depth]=1e9,mn[m-depth]=1e9; } for(auto [node,w]:v[u]) { if(node!=p&&vis[node]==0)compute(node,u,type,depth+w,lv+1); } } void centroid(int u) { dfs_size(u,u); int cen=find_cen(u,u,sz[u]/2); //printf("cen=%d\n",cen); vis[cen]=1; for(auto [node,w]:v[cen]) { if(vis[node]==0)compute(u,u,2,w,1); } for(auto [node,w]:v[cen]) { if(vis[node]==0) { compute(u,u,1,w,1); compute(u,u,0,w,1); } } for(auto [node,w]:v[cen]) { if(vis[node]==0) { centroid(node); } } /*for(int i=1;i<=n;i++) { printf("%d ",vis[i]); } printf("\n");*/ } int best_path(int N, int K, int H[][2], int L[]) { n=N,m=K; for(int i=0;i<n-1;i++) { v[H[i][0]+1].pb({H[i][1]+1,L[i]}); v[H[i][1]+1].pb({H[i][0]+1,L[i]}); } // for(int i=1;i<=n;i++) // { // printf("i=%d\n",i); // for(auto [node,w]:v[i]) // { // printf("%d %d\n",node,w); // } // printf("\n"); // } for(int i=1;i<=n;i++)vis[i]=0; for(int i=1;i<=1000000;i++)mn[i]=1e9; centroid(1); if(ans==1e9)return -1; return ans; }

Compilation message (stderr)

race.cpp: In function 'void dfs_size(int, int)':
race.cpp:14:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   14 |     for(auto [node,w]:v[u])
      |              ^
race.cpp: In function 'int find_cen(int, int, int)':
race.cpp:25:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   25 |     for(auto [node,w]:v[u])
      |              ^
race.cpp: In function 'void compute(int, int, int, int, int)':
race.cpp:47:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   47 |     for(auto [node,w]:v[u])
      |              ^
race.cpp: In function 'void centroid(int)':
race.cpp:58:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   58 |     for(auto [node,w]:v[cen])
      |              ^
race.cpp:62:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   62 |     for(auto [node,w]:v[cen])
      |              ^
race.cpp:70:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   70 |     for(auto [node,w]:v[cen])
      |              ^
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