Submission #777078

#	Time	Username	Problem	Language	Result	Execution time	Memory
777078		LeaRouse	Race (IOI11_race)	C++14	Compilation error	0 ms	0 KiB

race

#include <bits/stdc++.h>
#define fastio ios_base::sync_with_stdio(0); cin.tie(0);
#define ll long long
using namespace std;
const int MAX=2e5+5;
vector<pair<int,int>>v[MAX];
int D[MAX],N[MAX],vis[MAX],pa[MAX][25];

void st(int n){
    for(int j=1;j<20;j++){
        pa[0][j]=0;
        for(int i=1;i<n;i++){
            pa[i][j]=pa[pa[i][j-1]][j-1];
        }
    }
    
}

int lca(int x,int y){
    if(N[y]>N[x])   swap(x,y);
    int dif=N[x]-N[y];
    for(int i=20;i>=0;i--){
        if(dif&(1<<i)){
            dif-=(1<<i);
            x=pa[x][i];
        }
    }
    if(y==x)    return x;
    for(int i=18;i>=0;i--){
        if(pa[x][i]!=pa[y][i]){
            x=pa[x][i];
            y=pa[y][i];
        }
    }
    return pa[x][0];

}

void dfs(int u){
    vis[u]=1;
    for(auto it:v[u]){
        if(vis[it]) continue;
        D[it.ff]=D[u]+it.second;
        pa[it.ff][0]=u;
        N[it.ff]=N[u]+1;
        dfs(it.ff);
    }
}

int best_path(int n,int k,int w[][2],int nc[]){
    for(int i=0;i<n;i++){
        v[w[i][0]].push_back({w[i][1],nc[i]});
        v[w[i][1]].push_back({w[i][0],nc[i]});
    }
    dfs(0);
    st(n);
    int b=1e9;
    for(int i=0;i<n;i++){
        for(int j=i+1;j<n;j++){
            int a=lca(i,j);
            if(D[i]+D[j]-2*D[a]==k){
                b=min(N[i]+N[j]-2*N[a]+1,b);
            }
        }
    }
    return b;
}

Compilation message (stderr)

race.cpp: In function 'void dfs(int)':
race.cpp:42:15: error: no match for 'operator[]' (operand types are 'int [200005]' and 'std::pair<int, int>')
   42 |         if(vis[it]) continue;
      |               ^
race.cpp:43:14: error: 'struct std::pair<int, int>' has no member named 'ff'
   43 |         D[it.ff]=D[u]+it.second;
      |              ^~
race.cpp:44:15: error: 'struct std::pair<int, int>' has no member named 'ff'
   44 |         pa[it.ff][0]=u;
      |               ^~
race.cpp:45:14: error: 'struct std::pair<int, int>' has no member named 'ff'
   45 |         N[it.ff]=N[u]+1;
      |              ^~
race.cpp:46:16: error: 'struct std::pair<int, int>' has no member named 'ff'
   46 |         dfs(it.ff);
      |                ^~