Compilare: user.cpp: In function ‘int main()’: user.cpp:19:6: warning: unused variable ‘i’ [-Wunused-variable] int i, m, n; ^ user.cpp: In function ‘void kmp(char*, int)’: user.cpp:39:12: warning: unused variable ‘v’ [-Wunused-variable] int i, k, v, val; ^ user.cpp:39:15: warning: unused variable ‘val’ [-Wunused-variable] int i, k, v, val; ^ user.cpp: In function ‘int main()’: user.cpp:16:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("map.in", "r", stdin); ^ user.cpp:17:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("map.out", "w", stdout); ^ user.cpp:21:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n", &m, &n); ^ user.cpp:26:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", s + 1); ^