Language: C

n,t[999];int main(i){for(;n*=scanf("%d",&n);puts("")){bzero(t,999);for(;n--;t[i]=*t)scanf(" %c %c",&i,t);for(scanf("%d",&n);n--;putchar(!t[i]*i+t[i]))scanf(" %c",&i);}return0;}

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | n,t[999];int main(i){for(;n*=scanf("%d",&n);puts("")){bzero(t,999);for(;n--;t[i]=*t)scanf(" %c %c",&i,t);for(scanf("%d",&n);n--;putchar(!t[i]*i+t[i]))scanf(" %c",&i);}return0;}
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 'n' [-Wimplicit-int]
main.c:1:3: error: type defaults to 'int' in declaration of 't' [-Wimplicit-int]
    1 | n,t[999];int main(i){for(;n*=scanf("%d",&n);puts("")){bzero(t,999);for(;n--;t[i]=*t)scanf(" %c %c",&i,t);for(scanf("%d",&n);n--;putchar(!t[i]*i+t[i]))scanf(" %c",&i);}return0;}
      |   ^
main.c: In function 'main':
main.c:1:14: error: type of 'i' defaults to 'int' [-Wimplicit-int]
    1 | n,t[999];int main(i){for(;n*=scanf("%d",&n);puts("")){bzero(t,999);for(;n--;t[i]=*t)scanf(" %c %c",&i,t);for(scanf("%d",&n);n--;putchar(!t[i]*i+t[i]))scanf(" %c",&i);}return0;}
      |              ^~~~
main.c:1:30: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    1 | n,t[999];int main(i){for(;n*=scanf("%d",&n);puts("")){bzero(t,999);for(;n--;t[i]=*t)scanf(" %c %c",&i,t);for(scanf("%d",&n);n--;putchar(!t[i]*i+t[i]))scanf(" %c",&i);}return0;}
      |                              ^~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | n,t[999];int main(i){for(;n*=scanf("%d",&n);puts("")){bzero(t,999);for(;n--;t[i]=*t)scanf(" %c %c",&i,t);for(scanf("%d",&n);n--;putchar(!t[i]*i+t[i]))scanf(" %c",&i);}return0;}
main.c:1:30: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    1 | n,t[999];int main(i){for(;n*=scanf("%d",&n);puts("")){bzero(t,999);for(;n--;t[i]=*t)scanf(" %c %c",&i,t);for(scanf("%d",&n);n--;putchar(!t[i]*i+t[i]))scanf(" %c",&i);}return0;}
      |                              ^~~~~
main.c:1:30: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:1:45: error: implicit declaration of function 'puts' [-Wimplicit-function-declaration]
    1 | n,t[999];int main(i){for(;n*=scanf("%d",&n);puts("")){bzero(t,999);for(;n--;t[i]=*t)scanf(" %c %c",&i,t);for(scanf("%d",&n);n--;putchar(!t[i]*i+t[i]))scanf(" %c",&i);}return0;}
      |                                             ^~~~
main.c:1:45: note: include '<stdio.h>' or provide a declaration of 'puts'
main.c:1:55: error: implicit declaration of function 'bzero' [-Wimplicit-function-declaration]
    1 | n,t[999];int main(i){for(;n*=scanf("%d",&n);puts("")){bzero(t,999);for(;n--;t[i]=*t)scanf(" %c %c",&i,t);for(scanf("%d",&n);n--;putchar(!t[i]*i+t[i]))scanf(" %c",&i);}return0;}
      |                                                       ^~~~~
main.c:1:55: warning: incompatible implicit declaration of built-in function 'bzero' [-Wbuiltin-declaration-mismatch]
main.c:1:129: error: implicit declaration of function 'putchar' [-Wimplicit-function-declaration]
    1 | n,t[999];int main(i){for(;n*=scanf("%d",&n);puts("")){bzero(t,999);for(;n--;t[i]=*t)scanf(" %c %c",&i,t);for(scanf("%d",&n);n--;putchar(!t[i]*i+t[i]))scanf(" %c",&i);}return0;}
      |                                                                                                                                 ^~~~~~~
main.c:1:129: note: include '<stdio.h>' or provide a declaration of 'putchar'
main.c:1:168: error: 'return0' undeclared (first use in this function)
    1 | n,t[999];int main(i){for(;n*=scanf("%d",&n);puts("")){bzero(t,999);for(;n--;t[i]=*t)scanf(" %c %c",&i,t);for(scanf("%d",&n);n--;putchar(!t[i]*i+t[i]))scanf(" %c",&i);}return0;}
      |                                                                                                                                                                        ^~~~~~~
main.c:1:168: note: each undeclared identifier is reported only once for each function it appears in