Compilare: user.cpp: In function ‘void Set_Val()’: user.cpp:70:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < sons[i].size(); ++j) ^ user.cpp: In function ‘void Up()’: user.cpp:88:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < sons[1].size(); ++i) ^ user.cpp:102:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < sons[nod].size(); ++i) ^ user.cpp: In function ‘void Query()’: user.cpp:110:15: warning: unused variable ‘i’ [-Wunused-variable] int x, y, i, ans = 0; ^ user.cpp: In function ‘void Set()’: user.cpp:26:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d ", &n, &m); ^ user.cpp:29:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ", &father[ i ]); ^ user.cpp:33:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ", &val[ i ]); ^ user.cpp: In function ‘void Query()’: user.cpp:111:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^