Compilare: user.cpp: In function ‘void cycle1(int, int)’: user.cpp:20:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(A.size() + B.size() + 1 < len){ ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~ user.cpp: In function ‘void cycle2(int, int)’: user.cpp:35:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(A.size() + B.size() + 2 < len){ ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~ user.cpp: In function ‘int main()’: user.cpp:101:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d", &n, &m); ^ user.cpp:103:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int a, b; fscanf(fi,"%d%d", &a, &b); ^