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#include <stdio.h>
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int main()
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{
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int n, m;
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double a, max = -10.0;
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while(scanf("%d", &n) != EOF){
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for(int i = 0; i < n; i++){
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scanf("%d", &m);
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for(int j = 0; j < m; j++){
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scanf("%lf", &a);
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if(max < a) max = a;
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else ;
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}
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printf("%.2lf\n", max);
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max = -10.0;
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}
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}
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return 0;
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}
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