Compilare: main.cpp: In function 'void gn(int, int, int, int)': main.cpp:31:9: warning: unused variable 'nr' [-Wunused-variable] int nr,x,y; ^~ main.cpp: In function 'int main()': main.cpp:56:19: warning: format '%s' expects argument of type 'char*', but argument 2 has type 'char (*)[100001]' [-Wformat=] scanf("%s", &s); ^ main.cpp:54:38: 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); ^ main.cpp:55:40: 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); ^ main.cpp:56:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", &s); ^