matcnt.cpp:6:25: bits/stdc++.h: No such file or directory matcnt.cpp:19: `pair' was not declared in this scope matcnt.cpp:19: parse error before `,' token matcnt.cpp: In function `int main()': matcnt.cpp:40: `stdin' undeclared (first use this function) matcnt.cpp:40: (Each undeclared identifier is reported only once for each function it appears in.) matcnt.cpp:40: `freopen' undeclared (first use this function) matcnt.cpp:41: `stdout' undeclared (first use this function) matcnt.cpp:43: `cin' undeclared (first use this function) matcnt.cpp:58: `sol' undeclared (first use this function) matcnt.cpp:58: `make_pair' undeclared (first use this function) matcnt.cpp:70: `cout' undeclared (first use this function) matcnt.cpp:71: ISO C++ forbids declaration of `it' with no type matcnt.cpp:71: parse error before `:' token matcnt.cpp:71: warning: unused variable `int it'