include

include

include

include

int main() {

int testcases;
scanf("%d", &testcases);
int i;
for(i=0;i<testcases;i++){
    int numberofpeople;
    scanf("%d", &numberofpeople);
    printf("%d\n", (numberofpeople*(numberofpeople-1))/2);
}
return 0;

}

king gg