Compilare: user.cpp: In function ‘int main()’: user.cpp:26:57: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] if(a[ sparce[i][j-1] ] < a[ sparce[i + pwr(j-1)][j-1] ]) ^ user.cpp:6:22: note: in definition of macro ‘pwr’ #define pwr(x) (1 << x) ^ user.cpp:28:49: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] else sparce[i][j] = sparce[i + pwr(j-1)][j-1]; ^ user.cpp:6:22: note: in definition of macro ‘pwr’ #define pwr(x) (1 << x) ^ user.cpp:15:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &n, &m); ^ user.cpp:17:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d ", &a[i]); ^ user.cpp:33:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &low, &high); ^