Compilare: user.cpp: In function ‘int baga()’: user.cpp:22:12: warning: unused variable ‘k’ [-Wunused-variable] int i, j, k, S[MAXN], S2[MAXN]; ^ user.cpp: In function ‘void solve()’: user.cpp:43:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < E.size();) ^ user.cpp:48:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < E.size() && E[i] == q) i++; ^ user.cpp:58:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < E.size() && E[i] == q) i++; ^ user.cpp:40:12: warning: unused variable ‘k’ [-Wunused-variable] int i, j, k; ^ user.cpp: In function ‘void read_data()’: user.cpp:71:9: warning: unused variable ‘j’ [-Wunused-variable] int i, j, k; ^ user.cpp:71:12: warning: unused variable ‘k’ [-Wunused-variable] int i, j, k; ^ user.cpp: In function ‘int main()’: user.cpp:91:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("praslea.in", "rt", stdin); ^ user.cpp:92:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("praslea.out", "wt", stdout); ^