Compilare: user.cpp: In function ‘int Find(int)’: user.cpp:17:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:37:9: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation] if(Find(x) != Find(y)) ++nr; v[x] = y; ^~ user.cpp:37:38: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘if’ if(Find(x) != Find(y)) ++nr; v[x] = y; ^ user.cpp: At global scope: user.cpp:5:36: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) int Find(int x) ^~~~ user.cpp: In function ‘int main()’: user.cpp:21:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dfs.in", "r", stdin); ^ user.cpp:22:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dfs.out", "w", stdout); ^ user.cpp:26:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:35:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^