Compilare: user.cpp: In function ‘void solve(char*)’: user.cpp:87:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i++;i<strlen(a);i++) ^ user.cpp: In function ‘int main()’: user.cpp:168:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ecuatii2.in","r",stdin); ^ user.cpp:169:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ecuatii2.out","w",stdout); ^ user.cpp:170:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:174:27: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(a,256,stdin); ^