Compilare: user.cpp: In function ‘void Solve()’: user.cpp:38:16: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] else if( P[ LCA(a, b) ] == pMax) ^ user.cpp: In function ‘void preprocesare()’: user.cpp:67:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2; i <= 2 * E.size() + 10; ++i) ^ user.cpp:71:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<E.size(); ++i) ^ user.cpp:74:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<E.size(); ++i) ^ user.cpp: In function ‘void Euler(int, int)’: user.cpp:85:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G[node].size(); ++i) { ^ user.cpp: In function ‘void Solve()’: user.cpp:32:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a, &b); ^ user.cpp: In function ‘void Read()’: user.cpp:92:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("concurs.in", "rt", stdin); ^ user.cpp:93:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("concurs.out", "wt", stdout); ^ user.cpp:94:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ user.cpp:100:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &P[i]); ^ user.cpp:102:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a, &b); ^ user.cpp: In function ‘void Solve()’: user.cpp:47:33: warning: ‘yMax’ may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<pMax<<' '<<xMax<<' '<<yMax<<'\n'; ^ user.cpp:47:22: warning: ‘xMax’ may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<pMax<<' '<<xMax<<' '<<yMax<<'\n'; ^