Compilare: user.cpp: In function ‘int main()’: user.cpp:71:13: warning: unused variable ‘j’ [-Wunused-variable] int j = 1; ^ user.cpp:23:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d\n",&C); ^ user.cpp:24:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d\n",&N,&M); ^ user.cpp:26:43: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(S + 1 + (i - 1) * M,M + 5,f); ^ user.cpp:66:51: warning: iteration 1000004u invokes undefined behavior [-Waggressive-loop-optimizations] fact[i] = 1LL * fact[i - 1] * i % MOD2; ^ user.cpp:65:25: note: containing loop for(int i = 1;i <= 1000005;i++){ ^