Compilare: user.cpp: In function ‘int main()’: user.cpp:66:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<strlen(ans1); i++) ^ user.cpp:75:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<strlen(ans2); i++) ^ user.cpp:37:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("string.in","r",stdin); ^ user.cpp:38:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("string.out","w",stdout); ^ user.cpp:40:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&n); ^ user.cpp:43:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&s[i]); ^ user.cpp:63:5: warning: ‘ok’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(ok==1) ^