0_0_21851854_23365.cpp: In function 'int main()':
0_0_21851854_23365.cpp:37:22: error: 'sqrt' was not declared in this scope
int len=(sqrt(1+8*n)-1)/2;
^
0_0_21851854_23365.cpp:43:35: error: 'find' was not declared in this scope
iter=find(b.begin(),b.end(),tmp);
^
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