Submission #1868053

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Source Code Expand

#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <cstring>
#include <climits>
#include <vector>
#include <map>
#include <set>
#include <list>
#include <stack>
#include <queue>
#include <algorithm>
#include <iostream>
#include <string>
 
#define REP(i,n) for(int i=0;i<n;++i)
#define REPR(i,n) for(int i=n;i>=0;--i)
#define REPI(itr,v) for(auto itr=v.begin();itr!=v.end();++itr)
#define REPIR(itr,v) for(auto itr=v.rbegin();itr!=v.rend();++itr)
#define FOR(i,a,b) for(int i=a;i<b;++i)
#define SORT(v,n) sort(v, v+n)
#define SORTV(v) sort(v.begin(), v.end())
#define ALL(v) v.begin(),v.end()
#define llong long long
#define INF 999999999
#define SUR 1000000007
#define pb(a) push_back(a)
#define pf(a) push_front(a)
#define MP make_pair
#define MAX_V 100000

int dx[] = {0, 0, -1, 1};
int dy[] = {1, -1, 0, 0};
 
using namespace std;
 
typedef pair<int,int> pii;
 
struct edge{int to;llong cost;};

vector<edge> G[MAX_V];
llong depth[MAX_V];

void dfs(int v, int par, llong d){
  depth[v] = d;
  REP(i,(int)G[v].size()){
    if(G[v][i].to == par) continue;
    dfs(G[v][i].to, v, d + G[v][i].cost);
  }
}

int main(){

  int n;
  scanf("%d", &n);

  REP(i,n-1){
    int a, b, c;
    scanf("%d %d %d", &a, &b, &c);
    a--; b--;

    G[a].push_back({b,c});
    G[b].push_back({a,c});
  }

  int q, k;
  scanf("%d %d", &q, &k);

  k--;
  dfs(k, -1, 0);
  REP(i,q){
    int x, y;
    scanf("%d %d", &x, &y);
    x--; y--;
    printf("%lld\n", depth[x] + depth[y]);
  }
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:55:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &n);
                  ^
./Main.cpp:59:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d %d", &a, &b, &c);
                                  ^
./Main.cpp:67:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &q, &k);
                         ^
./Main.cpp:73:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &x, &y);
                           ^

Judge Result