Submission #821837

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;

#define REP(i,a,b) for(i=a;i<b;i++)
#define rep(i,n) REP(i,0,n)

#define mygc(c) (c)=getchar_unlocked()
#define mypc(c) putchar_unlocked(c)

#define ll long long
#define ull unsigned ll

void reader(int *x){int k,m=0;*x=0;for(;;){mygc(k);if(k=='-'){m=1;break;}if('0'<=k&&k<='9'){*x=k-'0';break;}}for(;;){mygc(k);if(k<'0'||k>'9')break;*x=(*x)*10+k-'0';}if(m)(*x)=-(*x);}
void reader(ll *x){int k,m=0;*x=0;for(;;){mygc(k);if(k=='-'){m=1;break;}if('0'<=k&&k<='9'){*x=k-'0';break;}}for(;;){mygc(k);if(k<'0'||k>'9')break;*x=(*x)*10+k-'0';}if(m)(*x)=-(*x);}
void reader(double *x){scanf("%lf",x);}
int reader(char c[]){int i,s=0;for(;;){mygc(i);if(i!=' '&&i!='\n'&&i!='\r'&&i!='\t'&&i!=EOF) break;}c[s++]=i;for(;;){mygc(i);if(i==' '||i=='\n'||i=='\r'||i=='\t'||i==EOF) break;c[s++]=i;}c[s]='\0';return s;}
template <class T, class S> void reader(T *x, S *y){reader(x);reader(y);}
template <class T, class S, class U> void reader(T *x, S *y, U *z){reader(x);reader(y);reader(z);}
template <class T, class S, class U, class V> void reader(T *x, S *y, U *z, V *w){reader(x);reader(y);reader(z);reader(w);}

void writer(int x, char c){int s=0,m=0;char f[10];if(x<0)m=1,x=-x;while(x)f[s++]=x%10,x/=10;if(!s)f[s++]=0;if(m)mypc('-');while(s--)mypc(f[s]+'0');mypc(c);}
void writer(ll x, char c){int s=0,m=0;char f[20];if(x<0)m=1,x=-x;while(x)f[s++]=x%10,x/=10;if(!s)f[s++]=0;if(m)mypc('-');while(s--)mypc(f[s]+'0');mypc(c);}
void writer(double x, char c){printf("%.15f",x);mypc(c);}
void writer(const char c[]){int i;for(i=0;c[i]!='\0';i++)mypc(c[i]);}
void writer(const char x[], char c){int i;for(i=0;x[i]!='\0';i++)mypc(x[i]);mypc(c);}
template<class T> void writerLn(T x){writer(x,'\n');}
template<class T, class S> void writerLn(T x, S y){writer(x,' ');writer(y,'\n');}
template<class T, class S, class U> void writerLn(T x, S y, U z){writer(x,' ');writer(y,' ');writer(z,'\n');}
template<class T> void writerArr(T x[], int n){int i;if(!n){mypc('\n');return;}rep(i,n-1)writer(x[i],' ');writer(x[n-1],'\n');}

char memarr[17000000]; void *mem = memarr;
#define MD 1000000007

int N;
int As[1000], Bs[1000];
char A[1000][1100], B[1000][1100];

int mat[26][26];

int deg[26];
priority_queue<int> q;
int ress, res[26];

int main(){
  int i, j, k, mx;

  reader(&N);
  rep(i,N){
    As[i] = reader(A[i]);
    Bs[i] = reader(B[i]);
  }

  rep(i,N){
    mx = min(As[i], Bs[i]);
    rep(j,mx) if(A[i][j] != B[i][j]) break;
    if(j==mx){
      if(j==Bs[i]){ writerLn("-1"); return 0; }
      continue;
    }
    mat[A[i][j]-'a'][B[i][j]-'a'] = 1;
  }

  rep(k,26) rep(i,26) rep(j,26) mat[i][j] |= mat[i][k]&mat[k][j];
  rep(i,26) if(mat[i][i]){
    writerLn("-1");
    return 0;
  }

  rep(i,26) rep(j,26) if(mat[i][j]) deg[j]++;
  rep(i,26) if(deg[i]==0) q.push(-i);
  while(q.size()){
    i = -q.top();
    q.pop();
    res[ress++] = i;
    rep(j,26) if(mat[i][j]){
      deg[j]--;
      if(deg[j]==0) q.push(-j);
    }
  }

  rep(i,ress) mypc(res[i]+'a');
  mypc('\n');
  

  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘void reader(double*)’:
./Main.cpp:15:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
 void reader(double *x){scanf("%lf",x);}
                                      ^

Judge Result