Compilare: user.cpp: In function ‘int invMod(int, int)’: user.cpp:33:9: warning: unused variable ‘i’ [-Wunused-variable] int i, p = Mod - 2, ans = 1, aux = x; ^ user.cpp: In function ‘void read()’: user.cpp:52:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("color3.in", "r", stdin); ^ user.cpp:53:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &n, &m, &k, &c); ^ user.cpp:55:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ", &C[i]); ^ user.cpp:59:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ", &a[j][i]); ^ user.cpp: In function ‘void write()’: user.cpp:141:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("color3.out", "w", stdout); ^ user.cpp: In function ‘void primeno()’: user.cpp:24:17: warning: iteration 109u invokes undefined behavior [-Waggressive-loop-optimizations] if (!w[i]) ^ user.cpp:23:5: note: containing loop for (i = 2; i < maxP; ++ i) ^