Compilare: user.cpp: In function ‘int main()’: user.cpp:45:9: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation] if(u != v) x++; parent[u] = v; ^~ user.cpp:45:25: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘if’ if(u != v) x++; parent[u] = v; ^~~~~~ user.cpp: At global scope: user.cpp:5:36: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) int get_int() ^~~~~~~ user.cpp: In function ‘int main()’: user.cpp:19:34: 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:20:36: 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:22:37: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, 2000000, stdin); ^