stalpi2.cpp:1:26: bits/stdc++.h: No such file or directory stalpi2.cpp: In function `int main()': stalpi2.cpp:13: `cin' undeclared (first use this function) stalpi2.cpp:13: (Each undeclared identifier is reported only once for each function it appears in.) stalpi2.cpp:16: `cout' undeclared (first use this function)