Submission #1450533

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Source Code Expand

#include <bits/stdc++.h>
#define SZ(X) ((int)(X).size())
#define ALL(X) (X).begin(), (X).end()
#define REP(I, N) for (int I = 0; I < (N); ++I)
#define REPP(I, A, B) for (int I = (A); I < (B); ++I)
#define RI(X) scanf("%d", &(X))
#define RII(X, Y) scanf("%d%d", &(X), &(Y))
#define RIII(X, Y, Z) scanf("%d%d%d", &(X), &(Y), &(Z))
#define DRI(X) int (X); scanf("%d", &X)
#define DRII(X, Y) int X, Y; scanf("%d%d", &X, &Y)
#define DRIII(X, Y, Z) int X, Y, Z; scanf("%d%d%d", &X, &Y, &Z)
#define RS(X) scanf("%s", (X))
#define CASET int ___T, case_n = 1; scanf("%d ", &___T); while (___T-- > 0)
#define MP make_pair
#define PB push_back
#define MS0(X) memset((X), 0, sizeof((X)))
#define MS1(X) memset((X), -1, sizeof((X)))
#define LEN(X) strlen(X)
#define PII pair<int,int>
#define VI vector<int>
#define VL vector<long long>
#define VPII vector<pair<int,int> >
#define PLL pair<long long,long long>
#define VPLL vector<pair<long long,long long> >
#define F first
#define S second
typedef long long LL;
using namespace std;
const int MOD = 1e9+7;
const int SIZE = 1e5+10;
VI E[2][SIZE];
VI ee[SIZE];
int root[2];
int V[2][SIZE];
int dfs0(VI e[],int x,int v[]){
    v[x]=1;
    VI ker;
    REP(i,SZ(e[x])){
        int y=e[x][i];
        ker.PB(dfs0(e,y,v));
        v[x]^=1;
    }
    for(int i=0;i+1<SZ(ker);i+=2){
        ee[ker[i]].PB(ker[i+1]);
        ee[ker[i+1]].PB(ker[i]);
    }
    if(v[x])return x;
    return ker.back();
}
int an[SIZE];
void go(int x,int v){
    an[x]=v;
    REP(i,SZ(ee[x])){
        int y=ee[x][i];
        if(!an[y])
            go(y,v*-1);
    }
}
int main(){
    DRI(N);
    REP(k,2){
        REPP(i,1,N+1){
            DRI(x);
            if(x==-1)root[k]=i;
            else E[k][x].PB(i);
        }
    }
    REP(k,2){
        dfs0(E[k],root[k],V[k]);
    }
    REPP(i,1,N+1){
        if(V[0][i]!=V[1][i])return 0*puts("IMPOSSIBLE");
    }
    puts("POSSIBLE");
    REPP(i,1,N+1){
        if(V[0][i]&&!an[i]){
            go(i,1);
        }
    }
    REPP(i,1,N+1)printf("%d%c",an[i]," \n"[i==N]);
    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:61:11: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     DRI(N);
           ^
./Main.cpp:64:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
             DRI(x);
                   ^

Judge Result