Compilare: main.c: In function 'main': main.c:6:82: warning: implicit declaration of function 'gets' [-Wimplicit-function-declaration] freopen("redu.in","r",stdin),freopen("redu.out","w",stdout),scanf("%d\n",&n),gets(s); ^~~~ main.c:6:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("redu.in","r",stdin),freopen("redu.out","w",stdout),scanf("%d\n",&n),gets(s); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:6:34: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("redu.in","r",stdin),freopen("redu.out","w",stdout),scanf("%d\n",&n),gets(s); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:6:65: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("redu.in","r",stdin),freopen("redu.out","w",stdout),scanf("%d\n",&n),gets(s); ^~~~~~~~~~~~~~~~ main.c:9:13: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&c[i][k]); ^~~~~~~~~~~~~~~~~~~~ ./cc9Z6omB.o: In function `main': main.c:(.text.startup+0x53): warning: the `gets' function is dangerous and should not be used.