Compilare: main.c: In function 'main': main.c:25:71: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] seg[k][i][j]=max(seg[k-1][i][j], seg[k-1][i][j + (1<<k-1)], seg[k-1][i + (1<<k-1)][j], seg[k-1][i + (1<<k-1)][j + (1<<k-1)]); ~^~ main.c:25:95: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] seg[k][i][j]=max(seg[k-1][i][j], seg[k-1][i][j + (1<<k-1)], seg[k-1][i + (1<<k-1)][j], seg[k-1][i + (1<<k-1)][j + (1<<k-1)]); ~^~ main.c:25:122: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] seg[k][i][j]=max(seg[k-1][i][j], seg[k-1][i][j + (1<<k-1)], seg[k-1][i + (1<<k-1)][j], seg[k-1][i + (1<<k-1)][j + (1<<k-1)]); ~^~ main.c:25:136: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] seg[k][i][j]=max(seg[k-1][i][j], seg[k-1][i][j + (1<<k-1)], seg[k-1][i + (1<<k-1)][j], seg[k-1][i + (1<<k-1)][j + (1<<k-1)]); ~^~ main.c:15:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:20:13: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &seg[0][i][j]); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:29:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &i, &j, &k); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~