Compilare: user.cpp: In function ‘int preprocessing()’: user.cpp:58:29: warning: unused variable ‘add’ [-Wunused-variable] int i, j, k, write, side, add; ^ user.cpp: In function ‘int main()’: user.cpp:82:16: warning: unused variable ‘add’ [-Wunused-variable] int i, j, k, add, side, write, test; ^ user.cpp:84:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("euclid.out", "w", stdout); ^ user.cpp:88:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &T); ^ user.cpp:90:45: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d %d %d", &N, &M, &H, &W); ^ user.cpp:94:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &rmq[0][j]); ^