#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */

/* Variables and functions */
int /*<<< orphan*/ printf(char *, int);
int /*<<< orphan*/ scanf(char *, int *);
int main(int argc, char const *argv[]) {
  int t;
  scanf("%d", &t);
  int n;
  for (; t > 0; t--) {
    scanf("%d", &n);
    printf("%d\n", n * (n - 1) / 2);
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
lea    0xec3(%rip),%rdi
lea    -0x14(%rbp),%rsi
call   1040 <scanf@plt>
cmpl   $0x0,-0x14(%rbp)
jle    1190 <main+0x70>
lea    0xea9(%rip),%rdi
lea    -0x18(%rbp),%rsi
call   1040 <scanf@plt>
mov    -0x18(%rbp),%eax
mov    -0x18(%rbp),%ecx
sub    $0x1,%ecx
imul   %ecx,%eax
mov    $0x2,%ecx
cltd
idiv   %ecx
mov    %eax,%esi
lea    0xe86(%rip),%rdi
call   1030 <printf@plt>
mov    -0x14(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,-0x14(%rbp)
jmp    1146 <main+0x26>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %rbx
sub    $0x10,%rsp
lea    0xed0(%rip),%rdi
lea    0x8(%rsp),%rsi
call   1040 <scanf@plt>
cmpl   $0x0,0x8(%rsp)
jle    1196 <main+0x76>
lea    0xeb8(%rip),%r14
lea    0xc(%rsp),%r15
lea    0xeaf(%rip),%rbx
cs nopw 0x0(%rax,%rax,1)
xchg   %ax,%ax
mov    %r14,%rdi
mov    %r15,%rsi
call   1040 <scanf@plt>
mov    0xc(%rsp),%eax
lea    -0x1(%rax),%ecx
imul   %eax,%ecx
mov    %ecx,%esi
shr    $0x1f,%esi
add    %ecx,%esi
sar    %esi
mov    %rbx,%rdi
call   1030 <printf@plt>
mov    0x8(%rsp),%eax
lea    -0x1(%rax),%ecx
mov    %ecx,0x8(%rsp)
cmp    $0x1,%eax
jg     1160 <main+0x40>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [3 x i8] c"%d\00"
@.str.1 = [4 x i8] c"%d\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
%7 = alloca i32
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%8 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32* %6)
br label %9
9: ; preds = %20, %2
%10 = load i32, i32* %6
%11 = icmp sgt i32 %10, 0
br i1 %11, label %12, label %23
12: ; preds = %9
%13 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32* %7)
%14 = load i32, i32* %7
%15 = load i32, i32* %7
%16 = sub nsw i32 %15, 1
%17 = mul nsw i32 %14, %16
%18 = sdiv i32 %17, 2
%19 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %18)
br label %20
20: ; preds = %12
%21 = load i32, i32* %6
%22 = add nsw i32 %21, -1
store i32 %22, i32* %6
br label %9
23: ; preds = %9
ret i32 0
}

LLVM IR (-O2):
@.str = [3 x i8] c"%d\00"
@.str.1 = [4 x i8] c"%d\0A\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = alloca i32
%4 = alloca i32
%5 = bitcast i32* %3 to i8*
%6 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32* %3)
%7 = bitcast i32* %4 to i8*
%8 = load i32, i32* %3
%9 = icmp sgt i32 %8, 0
br i1 %9, label %10, label %20
10: ; preds = %2, %10
%11 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32* %4)
%12 = load i32, i32* %4
%13 = add nsw i32 %12, -1
%14 = mul nsw i32 %13, %12
%15 = sdiv i32 %14, 2
%16 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %15)
%17 = load i32, i32* %3
%18 = add nsw i32 %17, -1
store i32 %18, i32* %3
%19 = icmp sgt i32 %17, 1
br i1 %19, label %10, label %20
20: ; preds = %10, %2
ret i32 0
}