Compilare: user.cpp: In function ‘int baga()’: user.cpp:95:12: warning: unused variable ‘k’ [-Wunused-variable] int i, j, k, S[MAXN], S2[MAXN]; ^ user.cpp: In function ‘void solve()’: user.cpp:116:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < E.size();) ^ user.cpp:121:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < E.size() && E[i] == q) i++; ^ user.cpp:131:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < E.size() && E[i] == q) i++; ^ user.cpp:113:12: warning: unused variable ‘k’ [-Wunused-variable] int i, j, k; ^ user.cpp: In function ‘void read_data()’: user.cpp:144:9: warning: unused variable ‘j’ [-Wunused-variable] int i, j, k; ^ user.cpp:144:12: warning: unused variable ‘k’ [-Wunused-variable] int i, j, k; ^ user.cpp: In function ‘int main()’: user.cpp:164:36: 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:165:38: 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); ^