Compilare: main.cpp: In function 'void FILL(int, int, int)': main.cpp:23:10: warning: unused variable 'x' [-Wunused-variable] char x, y; ^ main.cpp:23:13: warning: unused variable 'y' [-Wunused-variable] char x, y; ^ main.cpp: In function 'int main()': main.cpp:42:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("zone2.in", "r", stdin); ^ main.cpp:43:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("zone2.out", "w", stdout); ^ main.cpp:46:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &m, &k); ^ main.cpp: In function 'void reset()': main.cpp:17:13: warning: iteration 90005 invokes undefined behavior [-Waggressive-loop-optimizations] f[i]=0; ~~~~^~ main.cpp:16:19: note: within this loop for(int i=0; i<=90005; i++) ~^~~~~~~