Compilare: user.cpp: In function ‘int main()’: user.cpp:80:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] MAX=max(MAX,j+L[i].size()); ^ user.cpp:11:22: note: in definition of macro ‘max’ #define max(a,b) ((a>b) ? a : b) ^ user.cpp:44:26: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("a.in","r",stdin); ^ user.cpp:45:28: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("a.out","w",stdout); ^ user.cpp:48:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (i=1,scanf("%d%d",&N,&P);i<=N;++i) ^ user.cpp:50:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&A[i]); ^