Compilare: user.cpp: In function ‘void rotate1()’: user.cpp:20: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void rotate2()’: user.cpp:27: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void rotate3()’: user.cpp:35: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int solve(std::vector<std::pair<int, int>, std::allocator<std::pair<int, int> > >&)’: user.cpp:44: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:72: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:75: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result