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Ploshtina na krug

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Compilation time: 0.57 sec, absolute service time: 0,64 sec 
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Error(s):
source_file.cpp: In function ‘int main()’:
source_file.cpp:12:11: error: ‘o’ was not declared in this scope
    return o;  
           ^
source_file.cpp:11:20: warning: ignoring return value of ‘int system(const char*)’, declared with attribute warn_unused_result [-Wunused-result]
    system ("PAUSE");
                    ^