Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:29:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < Nxt[id].size(); ++ i) ^ user.cpp:38:40: warning: narrowing conversion of ‘(((int)x.Query::nr) + -1)’ from ‘int’ to ‘short int’ inside { } [-Wnarrowing] V[prv[id]].push_back({x.nr - 1, x.val}); ^ user.cpp: In function ‘void solve()’: user.cpp:63:38: warning: narrowing conversion of ‘nr’ from ‘int’ to ‘short int’ inside { } [-Wnarrowing] V[id].push_back({nr, val}); ^ user.cpp:63:38: warning: narrowing conversion of ‘val’ from ‘int’ to ‘short int’ inside { } [-Wnarrowing] user.cpp: In function ‘void read()’: user.cpp:24:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &q, &k); ^ user.cpp: In function ‘void solve()’: user.cpp:49:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &ty, &id); ^ user.cpp:53:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^ user.cpp:62:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &nr, &val); ^ user.cpp: In function ‘void write()’: user.cpp:74:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &r); ^