Compilare: user.cpp: In function ‘void Solve(long long unsigned int, long long unsigned int, int)’: user.cpp:16:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(len==n) ^ user.cpp:16:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(len==n) ^ user.cpp: In function ‘long long unsigned int f(long long unsigned int, long long unsigned int, long long unsigned int)’: user.cpp:40:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(len==n) ^ user.cpp: In function ‘int main()’: user.cpp:55:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("caps.in","r",stdin); ^ user.cpp:56:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("caps.out","w",stdout); ^ user.cpp:57:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:58:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("\n"); ^ user.cpp:59:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",s+1); ^ user.cpp:74:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%llu",&x); ^