Compilare: user.cpp: In function ‘void make()’: user.cpp:18:32: 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:20:33: 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:22:33: 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:43:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size() - st.size() + 1; i++) ^ user.cpp:45:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size() - dr.size() + 1; i++) ^ user.cpp:47:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < s.size(); i++) dp[i] += dp[i-1]; ^ user.cpp:49:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size() && cnt <= c1; i++){ ^ user.cpp:34:37: 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:35:39: 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); ^