Compilare: main.c: In function 'main': main.c:8:3: warning: implicit declaration of function 'gets' [-Wimplicit-function-declaration] gets(t); ^~~~ main.c:6:2: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("color.in","r",stdin),freopen("color.out","w",stdout),scanf("%lld%lld\n",&n,&m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:6:32: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("color.in","r",stdin),freopen("color.out","w",stdout),scanf("%lld%lld\n",&n,&m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:6:64: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("color.in","r",stdin),freopen("color.out","w",stdout),scanf("%lld%lld\n",&n,&m); ^~~~~~~~~~~~~~~~~~~~~~~~~ ./ccKdwAvw.o: In function `main': main.c:(.text.startup+0x73): warning: the `gets' function is dangerous and should not be used.