Compilare: main.cpp: In function 'int fast(std::__cxx11::string, std::__cxx11::string)': main.cpp:13:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<s.size(); ++i) ~^~~~~~~~~ main.cpp:15:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<t.size(); ++j) ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:173:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&n,&q); ^ main.cpp:178:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&v[i]); ^ main.cpp:189:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&a,&b); ^