In his State of the Union address this week, Trump alleged that Iran posed a direct threat to the US and that the country was “working to build missiles that will soon reach the United States of America”. But that claim has not been backed up with evidence by the White House or the Pentagon, and US intelligence reports from just last year say that it would take Iran 10 years to develop an intercontinental ballistic missile that could reach the US.
// 易错点4：栈空时返回1而非i+1 → 仅i=0时正确，i0时（如i=3）会返回1而非4
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