Compilare: main.cpp: In function 'void dfs(int, int, char)': main.cpp:24:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < G[u].size() ; j ++) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:50:43: warning: too many arguments for format [-Wformat-extra-args] printf("1\n" , key[x] , key[y]); ^ main.cpp:34:29: warning: unused variable 'st' [-Wunused-variable] int n , q , i , x , y , st , dr , lca; ^~ main.cpp:34:34: warning: unused variable 'dr' [-Wunused-variable] int n , q , i , x , y , st , dr , lca; ^~ main.cpp:34:39: warning: unused variable 'lca' [-Wunused-variable] int n , q , i , x , y , st , dr , lca; ^~~ main.cpp:32:49: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("aiacupalindroame.in" , "r" , stdin); ^ main.cpp:33:51: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("aiacupalindroame.out" , "w" , stdout); ^ main.cpp:35:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d" , &n , &q); ^ main.cpp:37:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d " , &t[i]); ^ main.cpp:48:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d" , &x, &y); ^