Compilare: user.cpp: In function ‘int main()’: user.cpp:63:67: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] d[di][dj][l][c] = gcd(d[di - 1][dj - 1][l + 1 << (di - 1) - 1][c + 1 << (dj) - 1], d[di][dj][l][c]); ^ user.cpp:63:90: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] d[di][dj][l][c] = gcd(d[di - 1][dj - 1][l + 1 << (di - 1) - 1][c + 1 << (dj) - 1], d[di][dj][l][c]); ^ user.cpp:64:63: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] d[di][dj][l][c] = gcd(d[di - 1][dj][l + 1 << (di - 1) - 1][c], d[di][dj][l][c]); ^ user.cpp:65:66: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] d[di][dj][l][c] = gcd(d[di][dj - 1][l][c + 1 << (dj - 1) - 1], d[di][dj][l][c]); ^ user.cpp:67:68: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] d[di][dj][l][c] = gcd(d[di][dj][l][c], a[l + 1 << di - 1][c + 1 << dj - 1]); ^ user.cpp:67:85: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] d[di][dj][l][c] = gcd(d[di][dj][l][c], a[l + 1 << di - 1][c + 1 << dj - 1]); ^ user.cpp:50:13: warning: variable ‘logm’ set but not used [-Wunused-but-set-variable] int logm, logn; ^ user.cpp:50:19: warning: variable ‘logn’ set but not used [-Wunused-but-set-variable] int logm, logn; ^ user.cpp:42:19: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] r(f, "%d", &T); ^ user.cpp:44:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] r(f, "%d%d%d%d", &m, &n, &h, &w); ^ user.cpp:47:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] r(f, "%d", &a[l][c]); ^