0_0_21173108_6172.cpp:105:16: error: '::main' must return 'int'
long long main() {
^
0_0_21173108_6172.cpp: In function 'int main()':
0_0_21173108_6172.cpp:115:9: error: 'prlong' was not declared in this scope
else prlong longf("%d\n", find(1, 1, n, a, b));
^
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