Compilare: user.cpp: In function ‘int div_imp(int, int, int, int, int&)’: user.cpp:16:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<strlen(s) && x1<=x2 && y1<=y2){ ^ user.cpp:47:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:54:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(s);++i){ ^ user.cpp:60:20: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] else if(isalpha(s[i])) ^ user.cpp:50:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("compresie.in","r",stdin); ^ user.cpp:51:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("compresie.out","w",stdout); ^ user.cpp:53:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",s); ^