Compilare: user.cpp: In function ‘void read()’: user.cpp:21:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ;i < strlen(s); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:30:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= count1; ++i) fact[i] = fact[i - 1] * i; ^ user.cpp:37:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( N > range){ fout << -1; return 0;} ^ user.cpp:47:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(N <= range) { ^