Compilare: user.cpp: In function ‘int main()’: user.cpp:31:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (strlen(v)>maxx) ^ user.cpp:37:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (strlen(v)==maxx) ^ user.cpp:61:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ii<strlen(a[i]) && jj<strlen(a[j]) && k<strlen(a[i])) ^ user.cpp:61:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ii<strlen(a[i]) && jj<strlen(a[j]) && k<strlen(a[i])) ^ user.cpp:61:67: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ii<strlen(a[i]) && jj<strlen(a[j]) && k<strlen(a[i])) ^ user.cpp:67:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k==strlen(a[i])) break; ^ user.cpp:22:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("interesant.in","r",stdin); ^ user.cpp:23:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("interesant.out","w",stdout); ^ user.cpp:24:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&p,&n); ^ user.cpp:30:32: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(v,5004,stdin); ^ user.cpp:50:37: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(a[++m],5004,stdin); ^