Compilare: main.cpp: In function 'int main()': main.cpp:47:79: warning: suggest parentheses around '+' inside '<<' [-Wparentheses] rmq[i][j][log2x][log2y]=max(rmq[i][j][log2x][log2y-1],rmq[i][min(j+1<<(log2y-1),N-1)][log2x][log2y-1]); ~^~ main.cpp:50:76: warning: suggest parentheses around '+' inside '<<' [-Wparentheses] rmq[i][j][log2x][log2y]=max(rmq[i][j][log2x-1][log2y],rmq[min(i+1<<(log2x-1),N-1)][j][log2x-1][log2y]); ~^~ main.cpp:21:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d",&n,&m,&q); ^ main.cpp:24:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%1d",&mat[i][j]); ^ main.cpp:63:43: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d%d",&x1,&y1,&x2,&y2); ^