Compilare: user.cpp: In function ‘bool dfs(int, int, int)’: user.cpp:45:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, xx, yy; ^ user.cpp: In function ‘bool canGo(int, int, int, int)’: user.cpp:40:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘void solve()’: user.cpp:69:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fs(f, "%d%d", &n, &m); ^ user.cpp:76:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fs(f, "%d", &x); ^ user.cpp: In function ‘int main()’: user.cpp:126:20: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fs(f, "%d", &t); ^