Submission #63261743

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;
#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops")
#define ALL(v) v.begin(),v.end()
#define For(i,_) for(int i=0,i##end=_;i<i##end;++i) // [0,_)
#define FOR(i,_,__) for(int i=_,i##end=__;i<i##end;++i) // [_,__)
#define Rep(i,_) for(int i=(_)-1;i>=0;--i) // [0,_)
#define REP(i,_,__) for(int i=(__)-1,i##end=_;i>=i##end;--i) // [_,__)
typedef long long ll;
typedef unsigned long long ull;
#define V vector
#define pb push_back
#define pf push_front
#define qb pop_back
#define qf pop_front
#define eb emplace_back
typedef pair<int,int> pii;
typedef pair<ll,int> pli;
#define fi first
#define se second
const int dir[4][2]={{-1,0},{0,1},{1,0},{0,-1}},inf=0x3f3f3f3f,mod=1e9+7;
const ll infl=0x3f3f3f3f3f3f3f3fll;
template<class T>inline bool ckmin(T &x,const T &y){return x>y?x=y,1:0;}
template<class T>inline bool ckmax(T &x,const T &y){return x<y?x=y,1:0;}
int init=[](){return cin.tie(nullptr)->sync_with_stdio(false),0;}();
int main(){
    int t_case=1;
    //scanf("%d",&t_case);
    while(t_case--){
        int n,q;
        scanf("%d%d",&n,&q);
        V<int>fa(n),id(n),rev(n);
        For(i,n)fa[i]=id[i]=rev[i]=i;
        while(q--){
            int op,x,y;
            scanf("%d%d",&op,&x),--x;
            if(op<3){
                scanf("%d",&y),--y;
                if(op&1)fa[x]=rev[y];
                else{
                    x=rev[x],y=rev[y];
                    swap(id[x],id[y]);
                    rev[id[x]]=x,rev[id[y]]=y;
                }
            }
            else{
                printf("%d\n",id[fa[x]]+1);
            }
        }
    }
    return 0;
}

Submission Info

Compile Error

Main.cpp: In function ‘int main()’:
Main.cpp:31:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   31 |         scanf("%d%d",&n,&q);
      |         ~~~~~^~~~~~~~~~~~~~
Main.cpp:36:18: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   36 |             scanf("%d%d",&op,&x),--x;
      |             ~~~~~^~~~~~~~~~~~~~~
Main.cpp:38:22: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   38 |                 scanf("%d",&y),--y;
      |                 ~~~~~^~~~~~~~~

Judge Result