Compilare: main.cpp: In constructor 'node::node()': main.cpp:12:17: warning: 'node::r' will be initialized after [-Wreorder] node* l; node* r; ^ main.cpp:10:6: warning: 'int node::co' [-Wreorder] int co,val,prio; ^~ main.cpp:13:2: warning: when initialized here [-Wreorder] node():val(0),prio(rand()),l(0),r(0),co(1),pa(0){} ^~~~ main.cpp: In constructor 'node::node(int)': main.cpp:12:17: warning: 'node::r' will be initialized after [-Wreorder] node* l; node* r; ^ main.cpp:10:6: warning: 'int node::co' [-Wreorder] int co,val,prio; ^~ main.cpp:14:2: warning: when initialized here [-Wreorder] node(int val):val(val),prio(rand()),l(0),r(0),co(1),pa(0){} ^~~~ main.cpp: In function 'int main()': main.cpp:121:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("permsort2.in","r",stdin); freopen("permsort2.out","w",stdout); ^ main.cpp:121:72: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("permsort2.in","r",stdin); freopen("permsort2.out","w",stdout); ^ main.cpp:122:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:126:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&arr[i]); ^