View Compilation Error

0_0_6562023_29155.cpp:51: error: `i' was not declared in this scope
0_0_6562023_29155.cpp: In function `void solve(int, int)':
0_0_6562023_29155.cpp:56: error: `graph' undeclared (first use this function)
0_0_6562023_29155.cpp:56: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6562023_29155.cpp: In function `int main(int, const char**)':
0_0_6562023_29155.cpp:73: error: `graph' undeclared (first use this function)