Compilare: user.cpp: In function ‘int main()’: user.cpp:110:17: warning: unused variable ‘from’ [-Wunused-variable] int from = T[j][curr[j]]; ^ user.cpp:117:17: warning: unused variable ‘to’ [-Wunused-variable] int to = T[j][curr[j]]; ^ user.cpp:70:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("patrol.in", "r", stdin); ^ user.cpp:71:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("patrol.out", "w", stdout); ^ user.cpp:72:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("debug.err", "w", stderr); ^