foo.cc: In function 'void deal()':
foo.cc:34:3: error: 's' was not declared in this scope
   s[i]=ans[i][i];
   ^
foo.cc: In function 'void getans(int, int)':
foo.cc:43:5: warning: statement has no effect [-Wunused-value]
    y==x;
     ^
foo.cc:44:7: error: 's' was not declared in this scope
    p+=s[x];
       ^

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