#17129. 计算1+2+3+4......+n之和
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ID: 17129
Type: Default
1000ms
128MiB
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计算1+2+3+4......+n之和
说明
计算1+2+3+4......+n之和
输入格式
一个整数n(0<n<=10000)
输出格式
和
1055