Compilare: main.cpp: In function 'int get(int, int, int, int)': main.cpp:14:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(l>r||l>=adj[node].size()) return 0; ~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:49:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<adj[i].size();j++) ~^~~~~~~~~~~~~~ main.cpp:35:30: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("arb3.in","r",stdin); freopen("arb3.out","w",stdout); ^ main.cpp:35:62: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("arb3.in","r",stdin); freopen("arb3.out","w",stdout); ^ main.cpp:36:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&q); ^ main.cpp:38:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&pa[i]); ^ main.cpp:41:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&arr[i]); ^ main.cpp:55:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x,&y); ^