Compilare: main.cpp: In function 'int main()': main.cpp:21:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d\n",&n,&m,&k); ^ main.cpp:22:28: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(s1+1,20000,stdin); ^ main.cpp:23:28: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(s2+1,20000,stdin); ^