0_0_22525260_13349.cpp:13:4: error: stray '\243' in program
sum=(1+n)*£¨n/2£©;
^
0_0_22525260_13349.cpp:13:4: error: stray '\250' in program
0_0_22525260_13349.cpp:13:4: error: stray '\243' in program
0_0_22525260_13349.cpp:13:4: error: stray '\251' in program
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