Compilare: user.cpp: In function ‘bool isLeaf(int)’: user.cpp:20:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < edg.size(); ++ i) ^ user.cpp:21:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = i + 1; j < edg.size(); ++ j) ^ user.cpp: In function ‘int main()’: user.cpp:57:15: warning: unused variable ‘j’ [-Wunused-variable] int m, i, j, x, y, leaf; ^ user.cpp:55:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tree2.in", "r", stdin); ^ user.cpp:56:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tree2.out", "w", stdout); ^ user.cpp:59:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:61:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ user.cpp:84:16: warning: ‘leaf’ may be used uninitialized in this function [-Wmaybe-uninitialized] print(leaf); ^