Compilare: user.cpp: In function ‘int main()’: user.cpp:17:43: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] freopen("strmatch.out", "wt", stdout);gets(a);gets(b);na=strlen(a);nb=strlen(b);p1=p2=1;hasha1=hasha2=0;for(int i = 0; i < na; i++){hasha1=(hasha1*p+a[i])%MOD1;hasha2=(hasha2*p+a[i])%MOD2;if (i!=0){p1=(p1*p)%MOD1;p2=(p2*p)%MOD2;}} ^~~~ In file included from user.cpp:1:0: /usr/include/stdio.h:638:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^~~~ user.cpp:17:49: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] freopen("strmatch.out", "wt", stdout);gets(a);gets(b);na=strlen(a);nb=strlen(b);p1=p2=1;hasha1=hasha2=0;for(int i = 0; i < na; i++){hasha1=(hasha1*p+a[i])%MOD1;hasha2=(hasha2*p+a[i])%MOD2;if (i!=0){p1=(p1*p)%MOD1;p2=(p2*p)%MOD2;}} ^ In file included from user.cpp:1:0: /usr/include/stdio.h:638:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^~~~ user.cpp:17:51: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] freopen("strmatch.out", "wt", stdout);gets(a);gets(b);na=strlen(a);nb=strlen(b);p1=p2=1;hasha1=hasha2=0;for(int i = 0; i < na; i++){hasha1=(hasha1*p+a[i])%MOD1;hasha2=(hasha2*p+a[i])%MOD2;if (i!=0){p1=(p1*p)%MOD1;p2=(p2*p)%MOD2;}} ^~~~ In file included from user.cpp:1:0: /usr/include/stdio.h:638:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^~~~ user.cpp:17:57: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] freopen("strmatch.out", "wt", stdout);gets(a);gets(b);na=strlen(a);nb=strlen(b);p1=p2=1;hasha1=hasha2=0;for(int i = 0; i < na; i++){hasha1=(hasha1*p+a[i])%MOD1;hasha2=(hasha2*p+a[i])%MOD2;if (i!=0){p1=(p1*p)%MOD1;p2=(p2*p)%MOD2;}} ^ In file included from user.cpp:1:0: /usr/include/stdio.h:638:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^~~~ user.cpp:16:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.in", "rt", stdin); ^ user.cpp:17:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.out", "wt", stdout);gets(a);gets(b);na=strlen(a);nb=strlen(b);p1=p2=1;hasha1=hasha2=0;for(int i = 0; i < na; i++){hasha1=(hasha1*p+a[i])%MOD1;hasha2=(hasha2*p+a[i])%MOD2;if (i!=0){p1=(p1*p)%MOD1;p2=(p2*p)%MOD2;}} ^ user.cpp:17:50: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.out", "wt", stdout);gets(a);gets(b);na=strlen(a);nb=strlen(b);p1=p2=1;hasha1=hasha2=0;for(int i = 0; i < na; i++){hasha1=(hasha1*p+a[i])%MOD1;hasha2=(hasha2*p+a[i])%MOD2;if (i!=0){p1=(p1*p)%MOD1;p2=(p2*p)%MOD2;}} ^ user.cpp:17:58: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.out", "wt", stdout);gets(a);gets(b);na=strlen(a);nb=strlen(b);p1=p2=1;hasha1=hasha2=0;for(int i = 0; i < na; i++){hasha1=(hasha1*p+a[i])%MOD1;hasha2=(hasha2*p+a[i])%MOD2;if (i!=0){p1=(p1*p)%MOD1;p2=(p2*p)%MOD2;}} ^ /tmp/ccIr1XGK.o: In function `main': user.cpp:(.text.startup+0x49): warning: the `gets' function is dangerous and should not be used.