Compilare: user.cpp: In function ‘int check(int, int)’: user.cpp:31:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (last>=poz[ch2[i]-'a'+1].size()) ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~ user.cpp:9:30: warning: unused variable ‘j’ [-Wunused-variable] int p=0,i,st,dr,mij,last,j; ^ user.cpp: In function ‘int main()’: user.cpp:41:15: warning: unused variable ‘j’ [-Wunused-variable] int n,i,q,j,e,m,st,dr,mij,last; ^ user.cpp:41:17: warning: unused variable ‘e’ [-Wunused-variable] int n,i,q,j,e,m,st,dr,mij,last; ^ user.cpp:39:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("balbaiala.in","r",stdin); ^ user.cpp:40:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("balbaiala.out","w",stdout); ^ user.cpp:42:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n",&n,&q); ^ user.cpp:43:29: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(ch+1,100003,stdin); ^ user.cpp:48:34: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(ch2+1,100003,stdin); ^