Compilare: user.cpp: In function ‘void make()’: user.cpp:18:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < s.size(); i++) H[i] = H[i - 1] + P[i] * s[i] % mod; ^ user.cpp:20:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < st.size(); i++) S = S + P[i] * st[i] % mod; ^ user.cpp:22:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < dr.size(); i++) Pr = Pr + P[i] * dr[i] % mod; ^ user.cpp: In function ‘int main()’: user.cpp:53:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size() - st.size() + 1; i++) if(ch(i, S, st.size())) pref[++c1] = i; ^ user.cpp:54:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size() - dr.size() + 1; i++) if(ch(i, Pr, dr.size())) suf[++c2] = i; ^ user.cpp:56:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size() && cnt <= c1; i++){ ^ user.cpp:44:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secv10.in", "r", stdin); ^ user.cpp:45:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secv10.out", "w", stdout); ^